diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
index bad2a37..2ed4b5d 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
@@ -11,6 +11,7 @@ using System.IO;
 using System.Linq;
 using System.Threading;
 using System.Windows.Forms;
+using WelsonJS.Launcher.Telemetry;
 
 namespace WelsonJS.Launcher
 {
@@ -21,6 +22,7 @@ namespace WelsonJS.Launcher
         public static Mutex _mutex;
         public static ResourceServer _resourceServer;
         public static string _dateTimeFormat;
+        public static TelemetryClient _telemetryClient;
 
         static Program()
         {
@@ -32,10 +34,10 @@ namespace WelsonJS.Launcher
 
             // load native libraries
             string appDataSubDirectory = "WelsonJS";
-           bool requireSigned = string.Equals(
-               GetAppConfig("NativeRequireSigned"),
-               "true",
-               StringComparison.OrdinalIgnoreCase);
+            bool requireSigned = string.Equals(
+                GetAppConfig("NativeRequireSigned"),
+                "true",
+                StringComparison.OrdinalIgnoreCase);
 
             NativeBootstrap.Init(
                 dllNames: new[] { "ChakraCore.dll" },
@@ -43,6 +45,35 @@ namespace WelsonJS.Launcher
                 logger: _logger,
                 requireSigned: requireSigned
             );
+
+            // telemetry
+            try
+            {
+                var telemetryProvider = GetAppConfig("TelemetryProvider");
+                var telemetryOptions = new TelemetryOptions
+                {
+                    ApiKey = GetAppConfig("TelemetryApiKey"),
+                    BaseUrl = GetAppConfig("TelemetryBaseUrl"),
+                    DistinctId = TelemetryIdentity.GetDistinctId(),
+                    Disabled = !string.Equals(
+                        GetAppConfig("TelemetryEnabled"),
+                        "true",
+                        StringComparison.OrdinalIgnoreCase)
+                };
+
+                if (!telemetryOptions.Disabled &&
+                    !string.IsNullOrWhiteSpace(telemetryProvider) &&
+                    !string.IsNullOrWhiteSpace(telemetryOptions.ApiKey) &&
+                    !string.IsNullOrWhiteSpace(telemetryOptions.BaseUrl))
+                {
+                    _telemetryClient = new TelemetryClient(telemetryProvider, telemetryOptions, _logger);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.Error($"Telemetry initialization failed: {ex}");
+                _telemetryClient = null;
+            }
         }
 
         [STAThread]
@@ -70,6 +101,13 @@ namespace WelsonJS.Launcher
                 return;
             }
 
+            // send event to the telemetry server
+            if (_telemetryClient != null)
+            {
+                var version = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "unknown";
+                _ = _telemetryClient.TrackAppStartedAsync("WelsonJS.Launcher", version);
+            }
+
             // draw the main form
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/AssemblyInfo.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/AssemblyInfo.cs
index 8b48616..520bc4d 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/AssemblyInfo.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호를
 // 기본값으로 할 수 있습니다.
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.2.7.55")]
-[assembly: AssemblyFileVersion("0.2.7.55")]
+[assembly: AssemblyVersion("0.2.7.58")]
+[assembly: AssemblyFileVersion("0.2.7.58")]
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs
index d329414..6ef92bc 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.Designer.cs
@@ -378,6 +378,42 @@ namespace WelsonJS.Launcher.Properties {
             }
         }
         
+        /// <summary>
+        ///   phc_pmRHJ0aVEhtULRT4ilexwCjYpGtE9VYRhlA05fwiYt8과(와) 유사한 지역화된 문자열을 찾습니다.
+        /// </summary>
+        internal static string TelemetryApiKey {
+            get {
+                return ResourceManager.GetString("TelemetryApiKey", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   https://us.i.posthog.com과(와) 유사한 지역화된 문자열을 찾습니다.
+        /// </summary>
+        internal static string TelemetryBaseUrl {
+            get {
+                return ResourceManager.GetString("TelemetryBaseUrl", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   true과(와) 유사한 지역화된 문자열을 찾습니다.
+        /// </summary>
+        internal static string TelemetryEnabled {
+            get {
+                return ResourceManager.GetString("TelemetryEnabled", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   posthog과(와) 유사한 지역화된 문자열을 찾습니다.
+        /// </summary>
+        internal static string TelemetryProvider {
+            get {
+                return ResourceManager.GetString("TelemetryProvider", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   141.101.82.1과(와) 유사한 지역화된 문자열을 찾습니다.
         /// </summary>
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx
index 7397892..0f32638 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Properties/Resources.resx
@@ -229,4 +229,16 @@
   <data name="icon_editor_32" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\icon_editor_32.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="TelemetryApiKey" xml:space="preserve">
+    <value>phc_pmRHJ0aVEhtULRT4ilexwCjYpGtE9VYRhlA05fwiYt8</value>
+  </data>
+  <data name="TelemetryBaseUrl" xml:space="preserve">
+    <value>https://us.i.posthog.com</value>
+  </data>
+  <data name="TelemetryProvider" xml:space="preserve">
+    <value>posthog</value>
+  </data>
+  <data name="TelemetryEnabled" xml:space="preserve">
+    <value>true</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/ITelemetryProvider.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/ITelemetryProvider.cs
new file mode 100644
index 0000000..40abe54
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/ITelemetryProvider.cs
@@ -0,0 +1,20 @@
+// ITelemetryProvider.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace WelsonJS.Launcher.Telemetry
+{
+    public interface ITelemetryProvider
+    {
+        Task TrackEventAsync(
+            string eventName,
+            IDictionary<string, object> properties = null,
+            CancellationToken cancellationToken = default
+        );
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/PosthogTelemetryProvider.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/PosthogTelemetryProvider.cs
new file mode 100644
index 0000000..5240b55
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/PosthogTelemetryProvider.cs
@@ -0,0 +1,94 @@
+// PosthogTelemetryProvider.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace WelsonJS.Launcher.Telemetry
+{
+    public sealed class PosthogTelemetryProvider : ITelemetryProvider, IDisposable
+    {
+        private readonly TelemetryOptions _options;
+        private readonly HttpClient _httpClient;
+        private readonly ICompatibleLogger _logger;
+        private bool _disposed;
+
+        public PosthogTelemetryProvider(TelemetryOptions options, ICompatibleLogger logger = null)
+        {
+            _options = options ?? throw new ArgumentNullException(nameof(options));
+
+            if (!_options.Disabled)
+            {
+                if (string.IsNullOrWhiteSpace(_options.ApiKey))
+                    throw new ArgumentException("PostHog API key is missing.");
+
+                if (string.IsNullOrWhiteSpace(_options.BaseUrl))
+                    throw new ArgumentException("PostHog BaseUrl is missing.");
+            }
+
+            if (string.IsNullOrWhiteSpace(_options.DistinctId))
+                _options.DistinctId = $"anon-{Guid.NewGuid():N}";
+
+            _httpClient = new HttpClient { Timeout = TimeSpan.FromSeconds(5) };
+            _logger = logger;
+        }
+
+        public async Task TrackEventAsync(
+            string eventName,
+            IDictionary<string, object> properties = null,
+            CancellationToken cancellationToken = default)
+        {
+            if (_disposed) throw new ObjectDisposedException(nameof(PosthogTelemetryProvider));
+            if (_options.Disabled) return;
+
+            if (string.IsNullOrWhiteSpace(eventName))
+                return;
+
+            string json;
+            using (var ser = new JsSerializer())
+            {
+                var payload = new Dictionary<string, object>
+                {
+                    ["api_key"] = _options.ApiKey,
+                    ["distinct_id"] = _options.DistinctId,
+                    ["event"] = eventName,
+                    ["properties"] = properties ?? new Dictionary<string, object>()
+                };
+
+                json = ser.Serialize(payload, 0);
+            }
+
+            var url = $"{_options.BaseUrl.TrimEnd('/')}/i/v0/e";
+
+            try
+            {
+                using (var response = await _httpClient.PostAsync(
+                    url,
+                    new StringContent(json, Encoding.UTF8, "application/json"),
+                    cancellationToken
+                ))
+                {
+                    response.EnsureSuccessStatusCode();
+                }
+            }
+            catch (Exception ex)
+            {
+                // Log and swallow for fire-and-forget telemetry
+                _logger?.Error($"Failed to send telemetry event '{eventName}': {ex.Message}");
+            }
+        }
+
+        public void Dispose()
+        {
+            if (_disposed) return;
+            _disposed = true;
+            _httpClient.Dispose();
+        }
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryClient.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryClient.cs
new file mode 100644
index 0000000..9fb1de7
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryClient.cs
@@ -0,0 +1,49 @@
+// TelemetryClient.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace WelsonJS.Launcher.Telemetry
+{
+    public sealed class TelemetryClient : IDisposable
+    {
+        private readonly ITelemetryProvider _provider;
+
+        public TelemetryClient(string providerName, TelemetryOptions options, ICompatibleLogger logger = null)
+        {
+            _provider = TelemetryProviderFactory.Create(providerName, options, logger);
+        }
+
+        public Task TrackEventAsync(
+            string eventName,
+            IDictionary<string, object> properties = null,
+            CancellationToken cancellationToken = default)
+        {
+            return _provider.TrackEventAsync(eventName, properties, cancellationToken);
+        }
+
+        public Task TrackAppStartedAsync(string appName, string appVersion)
+        {
+            var props = new Dictionary<string, object>
+            {
+                { "app_name", appName },
+                { "app_version", appVersion },
+                { "os_platform", Environment.OSVersion.Platform.ToString() },
+                { "os_version", Environment.OSVersion.Version.ToString() },
+                { "timestamp_utc", DateTime.UtcNow.ToString("o") }
+            };
+
+            return TrackEventAsync("app_started", props);
+        }
+
+        public void Dispose()
+        {
+            (_provider as IDisposable)?.Dispose();
+        }
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryIdentity.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryIdentity.cs
new file mode 100644
index 0000000..68852bb
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryIdentity.cs
@@ -0,0 +1,145 @@
+// TelemetryIdentity.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+using System.Collections.Generic;
+using System.Management;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace WelsonJS.Launcher.Telemetry
+{
+    public static class TelemetryIdentity
+    {
+        /// <summary>
+        /// Collects multiple hardware/OS identity sources (BIOS UUID, OS SerialNumber, MachineName),
+        /// joins them with ',' and computes SHA-256 hash, then returns the first 16 hex characters
+        /// as a compact Distinct ID.
+        /// </summary>
+        public static string GetDistinctId()
+        {
+            var sources = new List<string>();
+
+            string biosUuid = GetBiosUuid();
+            if (!string.IsNullOrEmpty(biosUuid))
+                sources.Add(biosUuid);
+
+            string osUuid = GetOsUuid();
+            if (!string.IsNullOrEmpty(osUuid))
+                sources.Add(osUuid);
+
+            string machineName = GetMachineName();
+            if (!string.IsNullOrEmpty(machineName))
+                sources.Add(machineName);
+
+            string raw = string.Join(",", sources);
+            string hash = ComputeSha256(raw);
+
+            if (!string.IsNullOrEmpty(hash) && hash.Length >= 16)
+                return hash.Substring(0, 16);
+
+            return hash;
+        }
+
+        private static string GetMachineName()
+        {
+            try { return Environment.MachineName ?? ""; }
+            catch { return ""; }
+        }
+
+        /// <summary>
+        /// Retrieves BIOS UUID from Win32_ComputerSystemProduct.
+        /// Filters out invalid values (all zeros or all 'F').
+        /// </summary>
+        private static string GetBiosUuid()
+        {
+            try
+            {
+                using (var searcher =
+                    new ManagementObjectSearcher("SELECT UUID FROM Win32_ComputerSystemProduct"))
+                {
+                    foreach (ManagementObject obj in searcher.Get())
+                    {
+                        string uuid = obj["UUID"] as string;
+                        if (string.IsNullOrEmpty(uuid))
+                            return null;
+
+                        uuid = uuid.Trim();
+                        string compact = uuid.Replace("-", "").ToUpperInvariant();
+
+                        // Exclude invalid dummy UUIDs such as all 0s or all Fs
+                        if (IsAllChar(compact, '0') || IsAllChar(compact, 'F'))
+                            return null;
+
+                        return uuid;
+                    }
+                }
+            }
+            catch { }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Retrieves OS-level UUID equivalent using Win32_OperatingSystem.SerialNumber.
+        /// This value is unique per Windows installation.
+        /// </summary>
+        private static string GetOsUuid()
+        {
+            try
+            {
+                using (var searcher =
+                    new ManagementObjectSearcher("SELECT SerialNumber FROM Win32_OperatingSystem"))
+                {
+                    foreach (ManagementObject obj in searcher.Get())
+                    {
+                        string serial = obj["SerialNumber"] as string;
+                        if (!string.IsNullOrEmpty(serial))
+                            return serial.Trim();
+                    }
+                }
+            }
+            catch { }
+
+            return null;
+        }
+
+        private static bool IsAllChar(string s, char c)
+        {
+            if (string.IsNullOrEmpty(s)) return false;
+            for (int i = 0; i < s.Length; i++)
+                if (s[i] != c) return false;
+            return true;
+        }
+
+        /// <summary>
+        /// Computes SHA-256 hex string for the given input text.
+        /// Returns null if hashing fails.
+        /// </summary>
+        private static string ComputeSha256(string input)
+        {
+            if (input == null) input = "";
+
+            try
+            {
+                using (var sha = SHA256.Create())
+                {
+                    var data = Encoding.UTF8.GetBytes(input);
+                    var digest = sha.ComputeHash(data);
+
+                    var sb = new StringBuilder(digest.Length * 2);
+                    for (int i = 0; i < digest.Length; i++)
+                        sb.Append(digest[i].ToString("x2"));
+
+                    return sb.ToString();
+                }
+            }
+            catch
+            {
+                return null;
+            }
+        }
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryOptions.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryOptions.cs
new file mode 100644
index 0000000..4b057a9
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryOptions.cs
@@ -0,0 +1,15 @@
+// TelemetryOptions.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+namespace WelsonJS.Launcher.Telemetry
+{
+    public class TelemetryOptions
+    {
+        public string ApiKey { get; set; }
+        public string BaseUrl { get; set; }
+        public string DistinctId { get; set; }
+        public bool Disabled { get; set; } = false;
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryProviderFactory.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryProviderFactory.cs
new file mode 100644
index 0000000..3454e15
--- /dev/null
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Telemetry/TelemetryProviderFactory.cs
@@ -0,0 +1,34 @@
+// TelemetryProviderFactory.cs
+// SPDX-License-Identifier: GPL-3.0-or-later
+// SPDX-FileCopyrightText: 2025 Catswords OSS and WelsonJS Contributors
+// https://github.com/gnh1201/welsonjs
+// 
+using System;
+
+namespace WelsonJS.Launcher.Telemetry
+{
+    public static class TelemetryProviderFactory
+    {
+        public static ITelemetryProvider Create(string provider, TelemetryOptions options, ICompatibleLogger logger = null)
+        {
+            if (options == null)
+                throw new ArgumentNullException(nameof(options));
+
+            if (provider == null)
+                throw new ArgumentNullException(nameof(provider));
+
+            provider = provider.ToLowerInvariant();
+
+            switch (provider)
+            {
+                case "posthog":
+                    return new PosthogTelemetryProvider(options, logger);
+
+                default:
+                    throw new NotSupportedException(
+                        "Unknown telemetry provider: " + provider
+                    );
+            }
+        }
+    }
+}
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj b/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj
index 5bc8b61..a656599 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/WelsonJS.Launcher.csproj
@@ -80,6 +80,7 @@
     <Reference Include="System.Deployment" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.IO.Compression.FileSystem" />
+    <Reference Include="System.Management" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Web" />
     <Reference Include="System.Windows.Forms" />
@@ -128,6 +129,12 @@
       <DependentUpon>GlobalSettingsForm.cs</DependentUpon>
     </Compile>
     <Compile Include="ResourceServer.cs" />
+    <Compile Include="Telemetry\ITelemetryProvider.cs" />
+    <Compile Include="Telemetry\PosthogTelemetryProvider.cs" />
+    <Compile Include="Telemetry\TelemetryClient.cs" />
+    <Compile Include="Telemetry\TelemetryIdentity.cs" />
+    <Compile Include="Telemetry\TelemetryOptions.cs" />
+    <Compile Include="Telemetry\TelemetryProviderFactory.cs" />
     <Compile Include="TraceLogger.cs" />
     <Compile Include="WebSocketManager.cs" />
     <EmbeddedResource Include="EnvForm.resx">
diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/app.config b/WelsonJS.Toolkit/WelsonJS.Launcher/app.config
index b74b7fe..617e7c7 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/app.config
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/app.config
@@ -26,6 +26,10 @@
     <add key="IpQueryApiPrefix2" value="https://api.abuseipdb.com/api/v2/"/>
     <add key="DateTimeFormat" value="yyyy-MM-dd HH:mm:ss"/>
     <add key="NativeRequireSigned" value="false"/>
+    <add key="TelemetryProvider" value="posthog"/>
+    <add key="TelemetryApiKey" value="phc_pmRHJ0aVEhtULRT4ilexwCjYpGtE9VYRhlA05fwiYt8"/>
+    <add key="TelemetryBaseUrl" value="https://us.i.posthog.com"/>
+    <add key="TelemetryEnabled" value="true"/>
   </appSettings>
   <startup>
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>