diff --git a/src/config/config.cpp b/src/config/config.cpp
index ffb40728c..9e88b11a3 100644
--- a/src/config/config.cpp
+++ b/src/config/config.cpp
@@ -49,9 +49,6 @@ bool ReadConfig() {
   config_impl->Read("fast_open", &FLAGS_tcp_fastopen);
   config_impl->Read("fast_open_connect", &FLAGS_tcp_fastopen_connect);
 
-#ifdef __linux__
-  config_impl->Read("congestion_algorithm", &FLAGS_congestion_algorithm);
-#endif
   config_impl->Read("doh_url", &FLAGS_doh_url);
   config_impl->Read("dot_host", &FLAGS_dot_host);
   config_impl->Read("connect_timeout", &FLAGS_connect_timeout);
@@ -62,6 +59,7 @@ bool ReadConfig() {
   config_impl->Read("tcp_keep_alive_cnt", &FLAGS_tcp_keep_alive_cnt);
   config_impl->Read("tcp_keep_alive_idle_timeout", &FLAGS_tcp_keep_alive_idle_timeout);
   config_impl->Read("tcp_keep_alive_interval", &FLAGS_tcp_keep_alive_interval);
+  config_impl->Read("tcp_congestion_algorithm", &FLAGS_tcp_congestion_algorithm);
 
   /* optional tls fields */
   config_impl->Read("cacert", &FLAGS_cacert);
@@ -121,9 +119,6 @@ bool SaveConfig() {
   all_fields_written &= config_impl->Write("fast_open", FLAGS_tcp_fastopen);
   all_fields_written &= config_impl->Write("fast_open_connect", FLAGS_tcp_fastopen_connect);
   static_cast<void>(config_impl->Delete("threads"));
-#ifdef __linux__
-  all_fields_written &= config_impl->Write("congestion_algorithm", FLAGS_congestion_algorithm);
-#endif
   all_fields_written &= config_impl->Write("doh_url", FLAGS_doh_url);
   all_fields_written &= config_impl->Write("dot_host", FLAGS_dot_host);
   all_fields_written &= config_impl->Write("timeout", FLAGS_connect_timeout);
@@ -135,6 +130,7 @@ bool SaveConfig() {
   all_fields_written &= config_impl->Write("tcp_keep_alive_cnt", FLAGS_tcp_keep_alive_cnt);
   all_fields_written &= config_impl->Write("tcp_keep_alive_idle_timeout", FLAGS_tcp_keep_alive_idle_timeout);
   all_fields_written &= config_impl->Write("tcp_keep_alive_interval", FLAGS_tcp_keep_alive_interval);
+  all_fields_written &= config_impl->Write("tcp_congestion_algorithm", FLAGS_tcp_congestion_algorithm);
 
   all_fields_written &= config_impl->Write("cacert", FLAGS_cacert);
   all_fields_written &= config_impl->Write("capath", FLAGS_capath);
diff --git a/src/config/config_network.cpp b/src/config/config_network.cpp
index a36fed662..e00fd278c 100644
--- a/src/config/config_network.cpp
+++ b/src/config/config_network.cpp
@@ -8,9 +8,6 @@
 ABSL_FLAG(bool, ipv6_mode, true, "Resolve names to IPv6 addresses");
 
 ABSL_FLAG(bool, reuse_port, true, "Reuse the listening port");
-#ifdef __linux__
-ABSL_FLAG(std::string, congestion_algorithm, "", "TCP Congestion Algorithm");
-#endif
 ABSL_FLAG(bool, tcp_fastopen, false, "TCP fastopen");
 ABSL_FLAG(bool, tcp_fastopen_connect, false, "TCP fastopen connect");
 ABSL_FLAG(int32_t, connect_timeout, 0, "Connect timeout (in seconds)");
@@ -24,6 +21,7 @@ ABSL_FLAG(int32_t,
           7200,
           "The number of seconds a connection needs to be idle before TCP begins sending out keep-alive probes.");
 ABSL_FLAG(int32_t, tcp_keep_alive_interval, 75, "The number of seconds between TCP keep-alive probes.");
+ABSL_FLAG(std::string, tcp_congestion_algorithm, "", "TCP Congestion Algorithm (Linux Only)");
 ABSL_FLAG(bool, redir_mode, false, "Enable TCP Redir mode support (linux only)");
 
 ABSL_FLAG(std::string, doh_url, "", "Resolve host names over DoH");
diff --git a/src/config/config_network.hpp b/src/config/config_network.hpp
index 71f426858..9ca21d057 100644
--- a/src/config/config_network.hpp
+++ b/src/config/config_network.hpp
@@ -10,9 +10,6 @@
 ABSL_DECLARE_FLAG(bool, ipv6_mode);
 
 ABSL_DECLARE_FLAG(bool, reuse_port);
-#ifdef __linux__
-ABSL_DECLARE_FLAG(std::string, congestion_algorithm);
-#endif
 ABSL_DECLARE_FLAG(bool, tcp_fastopen);
 ABSL_DECLARE_FLAG(bool, tcp_fastopen_connect);
 // same with proxy_connect_timeout no need for proxy_read_timeout
@@ -25,6 +22,7 @@ ABSL_DECLARE_FLAG(bool, tcp_keep_alive);
 ABSL_DECLARE_FLAG(int32_t, tcp_keep_alive_cnt);
 ABSL_DECLARE_FLAG(int32_t, tcp_keep_alive_idle_timeout);
 ABSL_DECLARE_FLAG(int32_t, tcp_keep_alive_interval);
+ABSL_DECLARE_FLAG(std::string, tcp_congestion_algorithm);
 ABSL_DECLARE_FLAG(bool, redir_mode);
 
 ABSL_DECLARE_FLAG(std::string, doh_url);
diff --git a/src/gtk/option_dialog.cpp b/src/gtk/option_dialog.cpp
index d8e530571..f44286e86 100644
--- a/src/gtk/option_dialog.cpp
+++ b/src/gtk/option_dialog.cpp
@@ -10,6 +10,7 @@
 #include "core/logging.hpp"
 #include "core/utils.hpp"
 #include "gtk/utils.hpp"
+#include "net/network.hpp"
 
 OptionDialog::OptionDialog(const std::string& title, GtkWindow* parent, bool modal)
     : impl_(GTK_DIALOG(gtk_dialog_new_with_buttons(title.c_str(),
@@ -27,12 +28,14 @@ OptionDialog::OptionDialog(const std::string& title, GtkWindow* parent, bool mod
   auto tcp_keep_alive_interval_label = gtk_label_new(_("TCP keep alive interval"));
 
   auto enable_post_quantum_kyber_label = gtk_label_new(_("Kyber post-quantum key agreement for TLS"));
+  auto tcp_congestion_algorithm = gtk_label_new(_("TCP Congestion Algorithm"));
 
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_label), 0, 0, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_cnt_label), 0, 1, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_idle_timeout_label), 0, 2, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_interval_label), 0, 3, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(enable_post_quantum_kyber_label), 0, 4, 1, 1);
+  gtk_grid_attach(grid, GTK_WIDGET(tcp_congestion_algorithm), 0, 5, 1, 1);
 
   tcp_keep_alive_ = GTK_CHECK_BUTTON(gtk_check_button_new());
   tcp_keep_alive_cnt_ = GTK_ENTRY(gtk_entry_new());
@@ -40,11 +43,19 @@ OptionDialog::OptionDialog(const std::string& title, GtkWindow* parent, bool mod
   tcp_keep_alive_interval_ = GTK_ENTRY(gtk_entry_new());
   enable_post_quantum_kyber_ = GTK_CHECK_BUTTON(gtk_check_button_new());
 
+  algorithms_ = net::GetTCPAvailableCongestionAlgorithms();
+
+  tcp_congestion_algorithm_ = GTK_COMBO_BOX_TEXT(gtk_combo_box_text_new());
+  for (const auto& algorithm : algorithms_) {
+    gtk_combo_box_text_append_text(tcp_congestion_algorithm_, algorithm.c_str());
+  }
+
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_), 1, 0, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_cnt_), 1, 1, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_idle_timeout_), 1, 2, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(tcp_keep_alive_interval_), 1, 3, 1, 1);
   gtk_grid_attach(grid, GTK_WIDGET(enable_post_quantum_kyber_), 1, 4, 1, 1);
+  gtk_grid_attach(grid, GTK_WIDGET(tcp_congestion_algorithm_), 1, 5, 1, 1);
 
   gtk_widget_set_margin_top(GTK_WIDGET(grid), 12);
   gtk_widget_set_margin_bottom(GTK_WIDGET(grid), 12);
@@ -79,8 +90,8 @@ OptionDialog::OptionDialog(const std::string& title, GtkWindow* parent, bool mod
 
   g_signal_connect(G_OBJECT(cancel_button_), "clicked", G_CALLBACK(*cancel_callback), this);
 
-  gtk_grid_attach(grid, GTK_WIDGET(okay_button_), 0, 5, 1, 1);
-  gtk_grid_attach(grid, GTK_WIDGET(cancel_button_), 1, 5, 1, 1);
+  gtk_grid_attach(grid, GTK_WIDGET(okay_button_), 0, 6, 1, 1);
+  gtk_grid_attach(grid, GTK_WIDGET(cancel_button_), 1, 6, 1, 1);
 
   gtk_container_add(GTK_CONTAINER(gtk_dialog_get_content_area(impl_)), GTK_WIDGET(grid));
 
@@ -120,6 +131,19 @@ void OptionDialog::LoadChanges() {
 
   gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(enable_post_quantum_kyber_),
                                absl::GetFlag(FLAGS_enable_post_quantum_kyber));
+
+  auto algorithm = absl::GetFlag(FLAGS_tcp_congestion_algorithm);
+  unsigned int i;
+  for (i = 0; i < std::size(algorithms_); ++i) {
+    if (algorithm == algorithms_[i])
+      break;
+  }
+
+  // first is unset
+  if (i == std::size(algorithms_)) {
+    i = 0;
+  }
+  gtk_combo_box_set_active(GTK_COMBO_BOX(tcp_congestion_algorithm_), i);
 }
 
 bool OptionDialog::OnSave() {
@@ -143,5 +167,12 @@ bool OptionDialog::OnSave() {
 
   absl::SetFlag(&FLAGS_enable_post_quantum_kyber, enable_post_quantum_kyber);
 
+  gchar* algorithm_cstr = gtk_combo_box_text_get_active_text(tcp_congestion_algorithm_);
+  if (algorithm_cstr == nullptr || std::string_view(algorithm_cstr).empty()) {
+    absl::SetFlag(&FLAGS_tcp_congestion_algorithm, std::string());
+  } else {
+    absl::SetFlag(&FLAGS_tcp_congestion_algorithm, algorithm_cstr);
+  }
+
   return true;
 }
diff --git a/src/gtk/option_dialog.hpp b/src/gtk/option_dialog.hpp
index 3ccc4acff..a4b851390 100644
--- a/src/gtk/option_dialog.hpp
+++ b/src/gtk/option_dialog.hpp
@@ -6,6 +6,7 @@
 #include <gtk/gtk.h>
 
 #include <string>
+#include <vector>
 
 class OptionDialog {
  public:
@@ -26,6 +27,8 @@ class OptionDialog {
   GtkEntry* tcp_keep_alive_idle_timeout_;
   GtkEntry* tcp_keep_alive_interval_;
   GtkCheckButton* enable_post_quantum_kyber_;
+  GtkComboBoxText* tcp_congestion_algorithm_;
+  std::vector<std::string> algorithms_;
 
   GtkButton* okay_button_;
   GtkButton* cancel_button_;
diff --git a/src/gtk/yass_en.po b/src/gtk/yass_en.po
index 3d4d1dd02..fef372f9d 100644
--- a/src/gtk/yass_en.po
+++ b/src/gtk/yass_en.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: 1.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-07-09 09:55+0800\n"
+"POT-Creation-Date: 2024-08-26 14:19+0800\n"
 "PO-Revision-Date: 2023-09-15 11:18+0800\n"
 "Last-Translator: Chilledheart <keeyou-cn@outlook.com>\n"
 "Language-Team: Chilledheart <keeyou-cn@outlook.com>\n"
@@ -17,170 +17,174 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
-#: option_dialog.cpp:27
+#: option_dialog.cpp:25
 msgid "TCP keep alive"
 msgstr "TCP keep alive"
 
-#: option_dialog.cpp:28
+#: option_dialog.cpp:26
 msgid "The number of TCP keep-alive probes"
 msgstr "The number of TCP keep-alive probes"
 
-#: option_dialog.cpp:29
+#: option_dialog.cpp:27
 msgid "TCP keep alive after idle"
 msgstr "TCP keep alive after idle"
 
-#: option_dialog.cpp:30
+#: option_dialog.cpp:28
 msgid "TCP keep alive interval"
 msgstr "TCP keep alive interval"
 
-#: option_dialog.cpp:32
+#: option_dialog.cpp:30
 msgid "Kyber post-quantum key agreement for TLS"
 msgstr "Kyber post-quantum key agreement for TLS"
 
-#: option_dialog.cpp:53
+#: option_dialog.cpp:32
+msgid "TCP Congestion Algorithm"
+msgstr "TCP Congestion Algorithm"
+
+#: option_dialog.cpp:76
 msgid "Okay"
 msgstr "Okay"
 
-#: option_dialog.cpp:56
+#: option_dialog.cpp:79
 msgid "Cancel"
 msgstr "Cancel"
 
-#: yass.cpp:234
+#: yass.cpp:232
 msgid "Connected with conns: "
 msgstr "Connected with conns: "
 
-#: yass.cpp:236
+#: yass.cpp:234
 msgid "Connecting"
 msgstr "Connecting"
 
-#: yass.cpp:238
+#: yass.cpp:236
 msgid "Failed to connect due to "
 msgstr "Failed to connect due to "
 
-#: yass.cpp:240
+#: yass.cpp:238
 msgid "Disconnecting"
 msgstr "Disconnecting"
 
-#: yass.cpp:242
+#: yass.cpp:240
 msgid "Disconnected with "
 msgstr "Disconnected with "
 
-#: yass_window.cpp:67
+#: yass_window.cpp:64
 msgid "File"
 msgstr "File"
 
-#: yass_window.cpp:68 yass_window.cpp:311 yass_window.cpp:370
+#: yass_window.cpp:65 yass_window.cpp:323 yass_window.cpp:383
 msgid "Option..."
 msgstr "Option..."
 
-#: yass_window.cpp:69 yass_window.cpp:312 yass_window.cpp:371
+#: yass_window.cpp:66 yass_window.cpp:324 yass_window.cpp:384
 msgid "Exit"
 msgstr "Exit"
 
-#: yass_window.cpp:92
+#: yass_window.cpp:89
 msgid "Help"
 msgstr "Help"
 
-#: yass_window.cpp:93
+#: yass_window.cpp:90
 msgid "About..."
 msgstr "About..."
 
-#: yass_window.cpp:108
+#: yass_window.cpp:105
 msgid "Start"
 msgstr "Start"
 
-#: yass_window.cpp:114
+#: yass_window.cpp:109
 msgid "Stop"
 msgstr "Stop"
 
-#: yass_window.cpp:147
+#: yass_window.cpp:131
 msgid "Server Host"
 msgstr "Server Host"
 
-#: yass_window.cpp:148
+#: yass_window.cpp:132
 msgid "Server SNI"
 msgstr "Server SNI"
 
-#: yass_window.cpp:149
+#: yass_window.cpp:133
 msgid "Server Port"
 msgstr "Server Port"
 
-#: yass_window.cpp:150
+#: yass_window.cpp:134
 msgid "Username"
 msgstr "Username"
 
-#: yass_window.cpp:151
+#: yass_window.cpp:135
 msgid "Password"
 msgstr "Password"
 
-#: yass_window.cpp:152
+#: yass_window.cpp:136
 msgid "Cipher/Method"
 msgstr "Cipher/Method"
 
-#: yass_window.cpp:153
+#: yass_window.cpp:137
 msgid "Local Host"
 msgstr "Local Host"
 
-#: yass_window.cpp:154
+#: yass_window.cpp:138
 msgid "Local Port"
 msgstr "Local Port"
 
-#: yass_window.cpp:155
+#: yass_window.cpp:139
 msgid "DNS over HTTPS URL"
 msgstr "DNS over HTTPS URL"
 
-#: yass_window.cpp:156
+#: yass_window.cpp:140
 msgid "DNS over TLS Host"
 msgstr "DNS over TLS Host"
 
-#: yass_window.cpp:157
+#: yass_window.cpp:141
 msgid "Limit Rate"
 msgstr "Limit Rate"
 
-#: yass_window.cpp:158
+#: yass_window.cpp:142
 msgid "Timeout"
 msgstr "Timeout"
 
-#: yass_window.cpp:159
+#: yass_window.cpp:143
 msgid "Auto Start"
 msgstr "Auto Start"
 
-#: yass_window.cpp:160
+#: yass_window.cpp:144
 msgid "System Proxy"
 msgstr "System Proxy"
 
-#: yass_window.cpp:263
+#: yass_window.cpp:275
 msgid "READY"
 msgstr "READY"
 
-#: yass_window.cpp:336 yass_window.cpp:369
+#: yass_window.cpp:348 yass_window.cpp:382
 msgid "Show"
 msgstr "Show"
 
-#: yass_window.cpp:531
+#: yass_window.cpp:544
 msgid " tx rate: "
 msgstr " tx rate: "
 
-#: yass_window.cpp:534
+#: yass_window.cpp:547
 msgid " rx rate: "
 msgstr " rx rate: "
 
-#: yass_window.cpp:645
+#: yass_window.cpp:658
 msgid "YASS Option"
 msgstr "YASS Option"
 
-#: yass_window.cpp:656
+#: yass_window.cpp:669
 msgid "Last Change: "
 msgstr "Last Change: "
 
-#: yass_window.cpp:659
+#: yass_window.cpp:672
 msgid "Enabled Feature: "
 msgstr "Enabled Feature: "
 
-#: yass_window.cpp:662
+#: yass_window.cpp:675
 msgid "GUI Variant: "
 msgstr "GUI Variant: "
 
-#: yass_window.cpp:671
+#: yass_window.cpp:684
 msgid "official-site"
 msgstr "official-site"
diff --git a/src/gtk/yass_zh_CN.po b/src/gtk/yass_zh_CN.po
index a7fb02519..94ceccf4c 100644
--- a/src/gtk/yass_zh_CN.po
+++ b/src/gtk/yass_zh_CN.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: 1.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-07-09 09:55+0800\n"
+"POT-Creation-Date: 2024-08-26 14:19+0800\n"
 "PO-Revision-Date: 2023-09-15 11:26+0800\n"
 "Last-Translator: Chilledheart <keeyou-cn@outlook.com>\n"
 "Language-Team: Chilledheart <keeyou-cn@outlook.com>\n"
@@ -18,170 +18,174 @@ msgstr ""
 "X-Generator: Poedit 2.2.4\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
 
-#: option_dialog.cpp:27
+#: option_dialog.cpp:25
 msgid "TCP keep alive"
 msgstr "TCP 保活"
 
-#: option_dialog.cpp:28
+#: option_dialog.cpp:26
 msgid "The number of TCP keep-alive probes"
 msgstr "TCP 保活测量数"
 
-#: option_dialog.cpp:29
+#: option_dialog.cpp:27
 msgid "TCP keep alive after idle"
 msgstr "TCP 在闲置以后的保活次数"
 
-#: option_dialog.cpp:30
+#: option_dialog.cpp:28
 msgid "TCP keep alive interval"
 msgstr "TCP 保活间隔"
 
-#: option_dialog.cpp:32
+#: option_dialog.cpp:30
 msgid "Kyber post-quantum key agreement for TLS"
 msgstr "TLS的Kyber后量子密钥协商"
 
-#: option_dialog.cpp:53
+#: option_dialog.cpp:32
+msgid "TCP Congestion Algorithm"
+msgstr "TCP 拥塞算法"
+
+#: option_dialog.cpp:76
 msgid "Okay"
 msgstr "确认"
 
-#: option_dialog.cpp:56
+#: option_dialog.cpp:79
 msgid "Cancel"
 msgstr "取消"
 
-#: yass.cpp:234
+#: yass.cpp:232
 msgid "Connected with conns: "
 msgstr "已产生连接: "
 
-#: yass.cpp:236
+#: yass.cpp:234
 msgid "Connecting"
 msgstr "连接中"
 
-#: yass.cpp:238
+#: yass.cpp:236
 msgid "Failed to connect due to "
 msgstr "无法连接因为 "
 
-#: yass.cpp:240
+#: yass.cpp:238
 msgid "Disconnecting"
 msgstr "断开连接中"
 
-#: yass.cpp:242
+#: yass.cpp:240
 msgid "Disconnected with "
 msgstr "断开连接于服务器 "
 
-#: yass_window.cpp:67
+#: yass_window.cpp:64
 msgid "File"
 msgstr "文件"
 
-#: yass_window.cpp:68 yass_window.cpp:311 yass_window.cpp:370
+#: yass_window.cpp:65 yass_window.cpp:323 yass_window.cpp:383
 msgid "Option..."
 msgstr "选项..."
 
-#: yass_window.cpp:69 yass_window.cpp:312 yass_window.cpp:371
+#: yass_window.cpp:66 yass_window.cpp:324 yass_window.cpp:384
 msgid "Exit"
 msgstr "退出"
 
-#: yass_window.cpp:92
+#: yass_window.cpp:89
 msgid "Help"
 msgstr "帮助"
 
-#: yass_window.cpp:93
+#: yass_window.cpp:90
 msgid "About..."
 msgstr "关于..."
 
-#: yass_window.cpp:108
+#: yass_window.cpp:105
 msgid "Start"
 msgstr "启动"
 
-#: yass_window.cpp:114
+#: yass_window.cpp:109
 msgid "Stop"
 msgstr "停止"
 
-#: yass_window.cpp:147
+#: yass_window.cpp:131
 msgid "Server Host"
 msgstr "服务器域名"
 
-#: yass_window.cpp:148
+#: yass_window.cpp:132
 msgid "Server SNI"
 msgstr "服务器名称指示"
 
-#: yass_window.cpp:149
+#: yass_window.cpp:133
 msgid "Server Port"
 msgstr "服务器端口号"
 
-#: yass_window.cpp:150
+#: yass_window.cpp:134
 msgid "Username"
 msgstr "用户名"
 
-#: yass_window.cpp:151
+#: yass_window.cpp:135
 msgid "Password"
 msgstr "密码"
 
-#: yass_window.cpp:152
+#: yass_window.cpp:136
 msgid "Cipher/Method"
 msgstr "加密方式"
 
-#: yass_window.cpp:153
+#: yass_window.cpp:137
 msgid "Local Host"
 msgstr "本地域名"
 
-#: yass_window.cpp:154
+#: yass_window.cpp:138
 msgid "Local Port"
 msgstr "本地端口号"
 
-#: yass_window.cpp:155
+#: yass_window.cpp:139
 msgid "DNS over HTTPS URL"
 msgstr "基于 HTTPS 的 DNS (DoH) URL"
 
-#: yass_window.cpp:156
+#: yass_window.cpp:140
 msgid "DNS over TLS Host"
 msgstr "基于 TLS 的 DNS (DoT) 域名"
 
-#: yass_window.cpp:157
+#: yass_window.cpp:141
 msgid "Limit Rate"
 msgstr "限制速率"
 
-#: yass_window.cpp:158
+#: yass_window.cpp:142
 msgid "Timeout"
 msgstr "超时时间"
 
-#: yass_window.cpp:159
+#: yass_window.cpp:143
 msgid "Auto Start"
 msgstr "随系统自启动"
 
-#: yass_window.cpp:160
+#: yass_window.cpp:144
 msgid "System Proxy"
 msgstr "系统代理"
 
-#: yass_window.cpp:263
+#: yass_window.cpp:275
 msgid "READY"
 msgstr "就绪"
 
-#: yass_window.cpp:336 yass_window.cpp:369
+#: yass_window.cpp:348 yass_window.cpp:382
 msgid "Show"
 msgstr "唤醒"
 
-#: yass_window.cpp:531
+#: yass_window.cpp:544
 msgid " tx rate: "
 msgstr " 上传速率: "
 
-#: yass_window.cpp:534
+#: yass_window.cpp:547
 msgid " rx rate: "
 msgstr " 下载速率: "
 
-#: yass_window.cpp:645
+#: yass_window.cpp:658
 msgid "YASS Option"
 msgstr "YASS 选项"
 
-#: yass_window.cpp:656
+#: yass_window.cpp:669
 msgid "Last Change: "
 msgstr "最后改动: "
 
-#: yass_window.cpp:659
+#: yass_window.cpp:672
 msgid "Enabled Feature: "
 msgstr "启用功能: "
 
-#: yass_window.cpp:662
+#: yass_window.cpp:675
 msgid "GUI Variant: "
 msgstr "图形版本: "
 
-#: yass_window.cpp:671
+#: yass_window.cpp:684
 msgid "official-site"
 msgstr "官方网站"
diff --git a/src/gtk4/option_dialog.cpp b/src/gtk4/option_dialog.cpp
index e065d37ef..5bccd31fb 100644
--- a/src/gtk4/option_dialog.cpp
+++ b/src/gtk4/option_dialog.cpp
@@ -9,6 +9,7 @@
 #include "core/logging.hpp"
 #include "core/utils.hpp"
 #include "gtk/utils.hpp"
+#include "net/network.hpp"
 
 extern "C" {
 
@@ -20,6 +21,7 @@ struct _OptionGtkDialog {
   GtkWidget* tcp_keep_alive_idle_timeout;
   GtkWidget* tcp_keep_alive_interval;
   GtkWidget* enable_post_quantum_kyber;
+  GtkWidget* tcp_congestion_algorithm;
 
   GtkWidget* okay_button;
   GtkWidget* cancel_button;
@@ -44,6 +46,7 @@ static void option_dialog_dispose(GObject* object) {
   gtk_widget_unparent(dialog->tcp_keep_alive_idle_timeout);
   gtk_widget_unparent(dialog->tcp_keep_alive_interval);
   gtk_widget_unparent(dialog->enable_post_quantum_kyber);
+  gtk_widget_unparent(dialog->tcp_congestion_algorithm);
 
   gtk_widget_unparent(dialog->okay_button);
   gtk_widget_unparent(dialog->cancel_button);
@@ -60,6 +63,7 @@ static void option_dialog_class_init(OptionGtkDialogClass* cls) {
   gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(cls), OptionGtkDialog, tcp_keep_alive_idle_timeout);
   gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(cls), OptionGtkDialog, tcp_keep_alive_interval);
   gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(cls), OptionGtkDialog, enable_post_quantum_kyber);
+  gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(cls), OptionGtkDialog, tcp_congestion_algorithm);
 
   gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(cls), OptionGtkDialog, okay_button);
   gtk_widget_class_bind_template_child(GTK_WIDGET_CLASS(cls), OptionGtkDialog, cancel_button);
@@ -88,6 +92,14 @@ OptionGtkDialog* option_dialog_new(const gchar* title, GtkWindow* parent, GtkDia
 
 OptionDialog::OptionDialog(const std::string& title, GtkWindow* parent, bool modal)
     : impl_(option_dialog_new(title.c_str(), parent, modal ? GTK_DIALOG_MODAL : GTK_DIALOG_DESTROY_WITH_PARENT)) {
+  algorithms_ = net::GetTCPAvailableCongestionAlgorithms();
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS
+  GtkComboBoxText* tcp_congestion_algorithm = GTK_COMBO_BOX_TEXT(impl_->tcp_congestion_algorithm);
+  for (const auto& algorithm : algorithms_) {
+    gtk_combo_box_text_append_text(tcp_congestion_algorithm, algorithm.c_str());
+  }
+  G_GNUC_END_IGNORE_DEPRECATIONS
+
   auto okay_callback = [](GtkButton* self, gpointer pointer) {
     OptionDialog* window = (OptionDialog*)pointer;
     window->OnOkayButtonClicked();
@@ -142,6 +154,21 @@ void OptionDialog::LoadChanges() {
 
   gtk_check_button_set_active(GTK_CHECK_BUTTON(impl_->enable_post_quantum_kyber),
                               absl::GetFlag(FLAGS_enable_post_quantum_kyber));
+
+  auto algorithm = absl::GetFlag(FLAGS_tcp_congestion_algorithm);
+  unsigned int i;
+  for (i = 0; i < std::size(algorithms_); ++i) {
+    if (algorithm == algorithms_[i])
+      break;
+  }
+
+  // first is unset
+  if (i == std::size(algorithms_)) {
+    i = 0;
+  }
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS
+  gtk_combo_box_set_active(GTK_COMBO_BOX(impl_->tcp_congestion_algorithm), i);
+  G_GNUC_END_IGNORE_DEPRECATIONS
 }
 
 bool OptionDialog::OnSave() {
@@ -165,5 +192,14 @@ bool OptionDialog::OnSave() {
   absl::SetFlag(&FLAGS_tcp_keep_alive_interval, tcp_keep_alive_interval.value());
 
   absl::SetFlag(&FLAGS_enable_post_quantum_kyber, enable_post_quantum_kyber);
+
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS
+  gchar* algorithm_cstr = gtk_combo_box_text_get_active_text(GTK_COMBO_BOX_TEXT(impl_->tcp_congestion_algorithm));
+  G_GNUC_END_IGNORE_DEPRECATIONS
+  if (algorithm_cstr == nullptr || std::string_view(algorithm_cstr).empty()) {
+    absl::SetFlag(&FLAGS_tcp_congestion_algorithm, std::string());
+  } else {
+    absl::SetFlag(&FLAGS_tcp_congestion_algorithm, algorithm_cstr);
+  }
   return true;
 }
diff --git a/src/gtk4/option_dialog.hpp b/src/gtk4/option_dialog.hpp
index 38816d160..f37f02fcf 100644
--- a/src/gtk4/option_dialog.hpp
+++ b/src/gtk4/option_dialog.hpp
@@ -6,6 +6,7 @@
 #include <gtk/gtk.h>
 
 #include <string>
+#include <vector>
 
 extern "C" {
 #define OPTION_DIALOG_TYPE (option_dialog_get_type())
@@ -32,6 +33,7 @@ class OptionDialog {
  private:
   friend class YASSWindow;
   OptionGtkDialog* impl_;
+  std::vector<std::string> algorithms_;
 };  // OptionDialog
 
 #endif  // OPTION_DIALOG_H
diff --git a/src/gtk4/option_dialog.ui b/src/gtk4/option_dialog.ui
index 50651a7fb..d54ce57c7 100644
--- a/src/gtk4/option_dialog.ui
+++ b/src/gtk4/option_dialog.ui
@@ -63,6 +63,16 @@
                 </layout>
               </object>
             </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="label" translatable="yes">TCP Congestion Algorithm</property>
+                <property name="xalign">0.0</property>
+                <layout>
+                  <property name="column">0</property>
+                  <property name="row">5</property>
+                </layout>
+              </object>
+            </child>
             <child>
               <object class="GtkCheckButton" id="tcp_keep_alive_check">
                 <layout>
@@ -103,12 +113,20 @@
                 </layout>
               </object>
             </child>
+            <child>
+              <object class="GtkComboBoxText" id="tcp_congestion_algorithm">
+                <layout>
+                  <property name="column">1</property>
+                  <property name="row">5</property>
+                </layout>
+              </object>
+            </child>
             <child>
               <object class="GtkButton" id="okay_button">
                 <property name="label" translatable="yes">Okay</property>
                 <layout>
                   <property name="column">0</property>
-                  <property name="row">5</property>
+                  <property name="row">6</property>
                 </layout>
               </object>
             </child>
@@ -117,7 +135,7 @@
                 <property name="label" translatable="yes">Cancel</property>
                 <layout>
                   <property name="column">1</property>
-                  <property name="row">5</property>
+                  <property name="row">6</property>
                 </layout>
               </object>
             </child>
diff --git a/src/gtk4/yass_en.po b/src/gtk4/yass_en.po
index cb96f41cc..a4ede1612 100644
--- a/src/gtk4/yass_en.po
+++ b/src/gtk4/yass_en.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: 1.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-07-25 13:13+0800\n"
+"POT-Creation-Date: 2024-08-26 14:25+0800\n"
 "PO-Revision-Date: 2023-05-24 14:35+0800\n"
 "Last-Translator: Chilledheart <keeyou-cn@outlook.com>\n"
 "Language-Team: Chilledheart <keeyou-cn@outlook.com>\n"
@@ -17,63 +17,63 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
-#: yass.cpp:302
+#: yass.cpp:297
 msgid "Connected with conns: "
 msgstr "Connected with conns: "
 
-#: yass.cpp:304
+#: yass.cpp:299
 msgid "Connecting"
 msgstr "Connecting"
 
-#: yass.cpp:306
+#: yass.cpp:301
 msgid "Failed to connect due to "
 msgstr "Failed to connect due to "
 
-#: yass.cpp:308
+#: yass.cpp:303
 msgid "Disconnecting"
 msgstr "Disconnecting"
 
-#: yass.cpp:310
+#: yass.cpp:305
 msgid "Disconnected with "
 msgstr "Disconnected with "
 
-#: yass.cpp:421
+#: yass_window.cpp:193
+msgid "READY"
+msgstr "READY"
+
+#: yass_window.cpp:266
 msgid "Last Change: "
 msgstr "Last Change: "
 
-#: yass.cpp:424
+#: yass_window.cpp:269
 msgid "Enabled Feature: "
 msgstr "Enabled Feature: "
 
-#: yass.cpp:427
+#: yass_window.cpp:272
 msgid "GUI Variant: "
 msgstr "GUI Variant: "
 
-#: yass.cpp:436
+#: yass_window.cpp:281
 msgid "official-site"
 msgstr "official-site"
 
-#: yass.cpp:442
+#: yass_window.cpp:298
 msgid "YASS Option"
 msgstr "YASS Option"
 
-#: yass_window.cpp:192
-msgid "READY"
-msgstr "READY"
-
-#: yass_window.cpp:319
+#: yass_window.cpp:397
 msgid " tx rate: "
 msgstr " tx rate: "
 
-#: yass_window.cpp:322
+#: yass_window.cpp:400
 msgid " rx rate: "
 msgstr " rx rate: "
 
-#: yass_window.cpp:357
+#: yass_window.cpp:435
 msgid "Start Failed"
 msgstr "Start Failed"
 
-#: yass_window.cpp:358
+#: yass_window.cpp:436
 msgid "OK"
 msgstr "OK"
 
@@ -113,11 +113,15 @@ msgstr "TCP keep alive interval"
 msgid "Kyber post-quantum key agreement for TLS"
 msgstr "Kyber post-quantum key agreement for TLS"
 
-#: option_dialog.ui:108
+#: option_dialog.ui:68
+msgid "TCP Congestion Algorithm"
+msgstr "TCP Congestion Algorithm"
+
+#: option_dialog.ui:126
 msgid "Okay"
 msgstr "Okay"
 
-#: option_dialog.ui:117
+#: option_dialog.ui:135
 msgid "Cancel"
 msgstr "Cancel"
 
@@ -185,6 +189,6 @@ msgstr "System Proxy"
 msgid "Start"
 msgstr "Start"
 
-#: yass_window.ui:291
+#: yass_window.ui:292
 msgid "Stop"
 msgstr "Stop"
diff --git a/src/gtk4/yass_zh_CN.po b/src/gtk4/yass_zh_CN.po
index 0b2f06f98..e40ea5697 100644
--- a/src/gtk4/yass_zh_CN.po
+++ b/src/gtk4/yass_zh_CN.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: 1.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-07-25 13:13+0800\n"
+"POT-Creation-Date: 2024-08-26 14:25+0800\n"
 "PO-Revision-Date: 2023-09-15 11:28+0800\n"
 "Last-Translator: Chilledheart <keeyou-cn@outlook.com>\n"
 "Language-Team: Chilledheart <keeyou-cn@outlook.com>\n"
@@ -18,63 +18,63 @@ msgstr ""
 "X-Generator: Poedit 2.2.4\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
 
-#: yass.cpp:302
+#: yass.cpp:297
 msgid "Connected with conns: "
 msgstr "已产生连接: "
 
-#: yass.cpp:304
+#: yass.cpp:299
 msgid "Connecting"
 msgstr "连接中"
 
-#: yass.cpp:306
+#: yass.cpp:301
 msgid "Failed to connect due to "
 msgstr "无法连接因为 "
 
-#: yass.cpp:308
+#: yass.cpp:303
 msgid "Disconnecting"
 msgstr "断开连接中"
 
-#: yass.cpp:310
+#: yass.cpp:305
 msgid "Disconnected with "
 msgstr "断开连接于服务器 "
 
-#: yass.cpp:421
+#: yass_window.cpp:193
+msgid "READY"
+msgstr "就绪"
+
+#: yass_window.cpp:266
 msgid "Last Change: "
 msgstr "最后改动: "
 
-#: yass.cpp:424
+#: yass_window.cpp:269
 msgid "Enabled Feature: "
 msgstr "启用功能: "
 
-#: yass.cpp:427
+#: yass_window.cpp:272
 msgid "GUI Variant: "
 msgstr "图形版本: "
 
-#: yass.cpp:436
+#: yass_window.cpp:281
 msgid "official-site"
 msgstr "官方网站"
 
-#: yass.cpp:442
+#: yass_window.cpp:298
 msgid "YASS Option"
 msgstr "YASS 选项"
 
-#: yass_window.cpp:192
-msgid "READY"
-msgstr "就绪"
-
-#: yass_window.cpp:319
+#: yass_window.cpp:397
 msgid " tx rate: "
 msgstr " 上传速率: "
 
-#: yass_window.cpp:322
+#: yass_window.cpp:400
 msgid " rx rate: "
 msgstr " 下载速率: "
 
-#: yass_window.cpp:357
+#: yass_window.cpp:435
 msgid "Start Failed"
 msgstr "启动失败"
 
-#: yass_window.cpp:358
+#: yass_window.cpp:436
 msgid "OK"
 msgstr "确认"
 
@@ -114,11 +114,15 @@ msgstr "TCP 保活间隔"
 msgid "Kyber post-quantum key agreement for TLS"
 msgstr "TLS的Kyber后量子密钥协商"
 
-#: option_dialog.ui:108
+#: option_dialog.ui:68
+msgid "TCP Congestion Algorithm"
+msgstr "TCP 拥塞算法"
+
+#: option_dialog.ui:126
 msgid "Okay"
 msgstr "确认"
 
-#: option_dialog.ui:117
+#: option_dialog.ui:135
 msgid "Cancel"
 msgstr "取消"
 
@@ -186,6 +190,6 @@ msgstr "系统代理"
 msgid "Start"
 msgstr "启动"
 
-#: yass_window.ui:291
+#: yass_window.ui:292
 msgid "Stop"
 msgstr "停止"
diff --git a/src/net/network.cpp b/src/net/network.cpp
index 81da9b3ba..d4e05880c 100644
--- a/src/net/network.cpp
+++ b/src/net/network.cpp
@@ -15,6 +15,7 @@
 #endif
 
 #include <absl/flags/flag.h>
+#include <absl/strings/str_split.h>
 #include <cerrno>
 #include <string_view>
 #include "config/config_network.hpp"
@@ -44,9 +45,9 @@ void SetSOReusePort(asio::ip::tcp::acceptor::native_handle_type handle, asio::er
 
 #ifdef __linux__
 static void PrintTcpAllowedCongestionControls() {
-  constexpr std::string_view kAllowedCongestionControl = "/proc/sys/net/ipv4/tcp_allowed_congestion_control";
+  const std::string procfs = "/proc/sys/net/ipv4/tcp_allowed_congestion_control";
   uint8_t buf[256];
-  auto ret = ReadFileToBuffer(std::string(kAllowedCongestionControl), make_span(buf));
+  auto ret = ReadFileToBuffer(procfs, buf);
   if (ret < 0) {
     return;
   }
@@ -54,11 +55,32 @@ static void PrintTcpAllowedCongestionControls() {
 }
 #endif
 
+std::vector<std::string> GetTCPAvailableCongestionAlgorithms() {
+  std::vector<std::string> ret;
+  ret.push_back(std::string());  // unspec
+#ifdef __linux__
+  uint8_t buf[4096];
+  const std::string procfs = "/proc/sys/net/ipv4/tcp_available_congestion_control";
+  ssize_t bytes = ReadFileToBuffer(procfs, buf);
+  if (bytes > 0 && bytes < (ssize_t)sizeof(buf)) {
+    std::string_view sbuf = std::string_view((const char*)buf, bytes);
+    LOG(INFO) << "Available TCP Congestion Algorithms: " << sbuf;
+    auto algorithms = absl::StrSplit(sbuf, absl::ByAnyChar(" \n\t\r"));
+    for (const auto& algorithm : algorithms) {
+      if (!algorithm.empty()) {
+        ret.push_back(std::string(algorithm));
+      }
+    }
+  }
+#endif
+  return ret;
+}
+
 void SetTCPCongestion(asio::ip::tcp::acceptor::native_handle_type handle, asio::error_code& ec) {
   (void)handle;
   ec = asio::error_code();
 #ifdef __linux__
-  const std::string new_algo = absl::GetFlag(FLAGS_congestion_algorithm);
+  const std::string new_algo = absl::GetFlag(FLAGS_tcp_congestion_algorithm);
   if (new_algo.empty()) {
     return;
   }
@@ -70,7 +92,7 @@ void SetTCPCongestion(asio::ip::tcp::acceptor::native_handle_type handle, asio::
   if (ret < 0 && (errno == EPROTONOSUPPORT || errno == ENOPROTOOPT)) {
     PLOG(WARNING) << "TCP_CONGESTION is not supported on this platform";
     LOG(WARNING) << "Ignore congestion algorithm settings";
-    absl::SetFlag(&FLAGS_congestion_algorithm, std::string());
+    absl::SetFlag(&FLAGS_tcp_congestion_algorithm, std::string());
     return;
   }
   if (ret < 0) {
@@ -88,7 +110,7 @@ void SetTCPCongestion(asio::ip::tcp::acceptor::native_handle_type handle, asio::
     PrintTcpAllowedCongestionControls();
     LOG(WARNING) << "Please load the algorithm kernel module before use!";
     LOG(WARNING) << "Ignore congestion algorithm settings";
-    absl::SetFlag(&FLAGS_congestion_algorithm, std::string());
+    absl::SetFlag(&FLAGS_tcp_congestion_algorithm, std::string());
     return;
   }
   VLOG(2) << "Previous congestion algorithm: " << old_algo;
diff --git a/src/net/network.hpp b/src/net/network.hpp
index 39eac13af..f79d0c383 100644
--- a/src/net/network.hpp
+++ b/src/net/network.hpp
@@ -8,12 +8,17 @@
 #include <malloc.h>
 #endif
 
+#include <string>
+#include <vector>
+
 #include "net/asio.hpp"
 
 namespace net {
 
 void SetSOReusePort(asio::ip::tcp::acceptor::native_handle_type handle, asio::error_code&);
 
+std::vector<std::string> GetTCPAvailableCongestionAlgorithms();
+
 void SetTCPCongestion(asio::ip::tcp::acceptor::native_handle_type handle, asio::error_code&);
 
 void SetTCPFastOpen(asio::ip::tcp::acceptor::native_handle_type handle, asio::error_code&);
diff --git a/src/qt6/lang/yass_en.ts b/src/qt6/lang/yass_en.ts
index a330dda6d..a9c0520a4 100644
--- a/src/qt6/lang/yass_en.ts
+++ b/src/qt6/lang/yass_en.ts
@@ -35,6 +35,10 @@
         <source>Cancel</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>TCP Congestion Algorithm</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>TrayIcon</name>
diff --git a/src/qt6/lang/yass_zh_CN.qm b/src/qt6/lang/yass_zh_CN.qm
index 1183cef56..51a3b21a4 100644
Binary files a/src/qt6/lang/yass_zh_CN.qm and b/src/qt6/lang/yass_zh_CN.qm differ
diff --git a/src/qt6/lang/yass_zh_CN.ts b/src/qt6/lang/yass_zh_CN.ts
index a7236bd85..047439d15 100644
--- a/src/qt6/lang/yass_zh_CN.ts
+++ b/src/qt6/lang/yass_zh_CN.ts
@@ -35,6 +35,10 @@
         <source>Cancel</source>
         <translation>取消</translation>
     </message>
+    <message>
+        <source>TCP Congestion Algorithm</source>
+        <translation>TCP 拥塞算法</translation>
+    </message>
 </context>
 <context>
     <name>TrayIcon</name>
diff --git a/src/qt6/option_dialog.cpp b/src/qt6/option_dialog.cpp
index d8a92984b..3f8ab643d 100644
--- a/src/qt6/option_dialog.cpp
+++ b/src/qt6/option_dialog.cpp
@@ -4,6 +4,7 @@
 
 #include <absl/flags/flag.h>
 #include <QCheckBox>
+#include <QComboBox>
 #include <QGridLayout>
 #include <QIntValidator>
 #include <QLabel>
@@ -13,6 +14,7 @@
 #include "config/config.hpp"
 #include "core/logging.hpp"
 #include "core/utils.hpp"
+#include "net/network.hpp"
 
 OptionDialog::OptionDialog(QWidget* parent) : QDialog(parent) {
   setWindowTitle(tr("YASS Option"));
@@ -29,12 +31,14 @@ OptionDialog::OptionDialog(QWidget* parent) : QDialog(parent) {
   auto tcp_keep_alive_interval_label = new QLabel(tr("TCP keep alive interval"));
 
   auto enable_post_quantum_kyber_label = new QLabel(tr("Kyber post-quantum key agreement for TLS"));
+  auto tcp_congestion_algorithm_label = new QLabel(tr("TCP Congestion Algorithm"));
 
   grid->addWidget(tcp_keep_alive_label, 0, 0);
   grid->addWidget(tcp_keep_alive_cnt_label, 1, 0);
   grid->addWidget(tcp_keep_alive_idle_timeout_label, 2, 0);
   grid->addWidget(tcp_keep_alive_interval_label, 3, 0);
   grid->addWidget(enable_post_quantum_kyber_label, 4, 0);
+  grid->addWidget(tcp_congestion_algorithm_label, 5, 0);
 
   tcp_keep_alive_ = new QCheckBox;
   tcp_keep_alive_cnt_ = new QLineEdit;
@@ -44,12 +48,20 @@ OptionDialog::OptionDialog(QWidget* parent) : QDialog(parent) {
   tcp_keep_alive_interval_ = new QLineEdit;
   tcp_keep_alive_interval_->setValidator(new QIntValidator(0, INT32_MAX, this));
   enable_post_quantum_kyber_ = new QCheckBox;
+  tcp_congestion_algorithm_ = new QComboBox;
+
+  algorithms_ = net::GetTCPAvailableCongestionAlgorithms();
+
+  for (const auto& algorithm : algorithms_) {
+    tcp_congestion_algorithm_->addItem(algorithm.c_str());
+  }
 
   grid->addWidget(tcp_keep_alive_, 0, 1);
   grid->addWidget(tcp_keep_alive_cnt_, 1, 1);
   grid->addWidget(tcp_keep_alive_idle_timeout_, 2, 1);
   grid->addWidget(tcp_keep_alive_interval_, 3, 1);
   grid->addWidget(enable_post_quantum_kyber_, 4, 1);
+  grid->addWidget(tcp_congestion_algorithm_, 5, 1);
 
   okay_button_ = new QPushButton(tr("Okay"));
   connect(okay_button_, &QPushButton::clicked, this, &OptionDialog::OnOkayButtonClicked);
@@ -57,8 +69,8 @@ OptionDialog::OptionDialog(QWidget* parent) : QDialog(parent) {
   cancel_button_ = new QPushButton(tr("Cancel"));
   connect(cancel_button_, &QPushButton::clicked, this, &OptionDialog::OnCancelButtonClicked);
 
-  grid->addWidget(okay_button_, 5, 0);
-  grid->addWidget(cancel_button_, 5, 1);
+  grid->addWidget(okay_button_, 6, 0);
+  grid->addWidget(cancel_button_, 6, 1);
 
   setLayout(grid);
 
@@ -89,6 +101,20 @@ void OptionDialog::LoadChanges() {
       QString::fromUtf8(tcp_keep_alive_interval_str.c_str(), tcp_keep_alive_interval_str.size()));
 
   enable_post_quantum_kyber_->setChecked(absl::GetFlag(FLAGS_enable_post_quantum_kyber));
+
+  auto algorithm = absl::GetFlag(FLAGS_tcp_congestion_algorithm);
+  unsigned int i;
+  for (i = 0; i < std::size(algorithms_); ++i) {
+    if (algorithm == algorithms_[i])
+      break;
+  }
+
+  // first is unset
+  if (i == std::size(algorithms_)) {
+    i = 0;
+  }
+
+  tcp_congestion_algorithm_->setCurrentIndex(i);
 }
 
 bool OptionDialog::OnSave() {
@@ -112,5 +138,10 @@ bool OptionDialog::OnSave() {
 
   absl::SetFlag(&FLAGS_enable_post_quantum_kyber, enable_post_quantum_kyber);
 
+  int i = tcp_congestion_algorithm_->currentIndex();
+  DCHECK_GE(i, 0);
+  DCHECK_LE(i, (int)algorithms_.size());
+  absl::SetFlag(&FLAGS_tcp_congestion_algorithm, algorithms_[i]);
+
   return true;
 }
diff --git a/src/qt6/option_dialog.hpp b/src/qt6/option_dialog.hpp
index 3e222301a..16b9f5874 100644
--- a/src/qt6/option_dialog.hpp
+++ b/src/qt6/option_dialog.hpp
@@ -5,7 +5,11 @@
 
 #include <QDialog>
 
+#include <string>
+#include <vector>
+
 class QCheckBox;
+class QComboBox;
 class QLineEdit;
 class QPushButton;
 class OptionDialog : public QDialog {
@@ -27,6 +31,8 @@ class OptionDialog : public QDialog {
   QLineEdit* tcp_keep_alive_idle_timeout_;
   QLineEdit* tcp_keep_alive_interval_;
   QCheckBox* enable_post_quantum_kyber_;
+  QComboBox* tcp_congestion_algorithm_;
+  std::vector<std::string> algorithms_;
 
   QPushButton* okay_button_;
   QPushButton* cancel_button_;