diff --git a/Sources/Gravatar/BundleInfo.swift b/Sources/Gravatar/BundleInfo.swift
index 8d2dbe70..674065db 100644
--- a/Sources/Gravatar/BundleInfo.swift
+++ b/Sources/Gravatar/BundleInfo.swift
@@ -5,10 +5,23 @@ package enum BundleInfo {
         getInfoValue(forKey: "CFBundleShortVersionString") as? String
     }
 
+    /// The `CFBundleName`.
+    ///
+    /// This string may be localized.
     package static var appName: String? {
         Bundle.main.object(forInfoDictionaryKey: "CFBundleName") as? String
     }
 
+    /// The `CFBundleExecutable` name.
+    package static var executableName: String? {
+        Bundle.main.object(forInfoDictionaryKey: "CFBundleExecutable") as? String
+    }
+
+    package static var appIdentifier: String? {
+        guard let bundleID = Bundle.main.bundleIdentifier else { return nil }
+        return String(bundleID.hashed().prefix(10))
+    }
+
     private static func getInfoValue(forKey key: String) -> Any? {
         // Access the SDKInfo.plist using Bundle.module
         guard let url = Bundle.module.url(forResource: "SDKInfo", withExtension: "plist"),
diff --git a/Sources/Gravatar/Network/Services/URLSessionHTTPClient.swift b/Sources/Gravatar/Network/Services/URLSessionHTTPClient.swift
index 29a01482..d960a88a 100644
--- a/Sources/Gravatar/Network/Services/URLSessionHTTPClient.swift
+++ b/Sources/Gravatar/Network/Services/URLSessionHTTPClient.swift
@@ -7,6 +7,10 @@ enum HTTPClientError: Error {
     case URLSessionError(Error)
 }
 
+private enum Constants {
+    static let sdkName = "Gravatar-SDK"
+}
+
 struct URLSessionHTTPClient: HTTPClient {
     private let urlSession: URLSessionProtocol
 
@@ -14,9 +18,10 @@ struct URLSessionHTTPClient: HTTPClient {
         let configuration = URLSessionConfiguration.default
         configuration.httpAdditionalHeaders = [
             "Accept": "application/json",
-            "X-Platform": "ios",
+            "X-Platform": osName().lowercased(),
             "X-SDK-Version": BundleInfo.sdkVersion ?? "",
-            "X-Source": BundleInfo.appName ?? "",
+            "X-Source": BundleInfo.executableName ?? "",
+            "User-Agent": Self.userAgent,
         ]
         self.urlSession = urlSession ?? URLSession(configuration: configuration)
     }
@@ -51,6 +56,23 @@ extension URLRequest {
     }
 }
 
+extension URLSessionHTTPClient {
+    private static var userAgent: String {
+        "\(Constants.sdkName)/\(BundleInfo.sdkVersion) (\(osName()) \(ProcessInfo.processInfo.osVersionDottedString); AppID \(BundleInfo.appIdentifier ?? "Unknown"))"
+    }
+}
+
+private func osName() -> String {
+    let osName: String
+    #if os(iOS)
+    osName = "iOS"
+    #else
+    osName = "Unknown OS"
+    assertionFailure("Update '\(#function)' to include the current OS name (iOS, macOS, tvOS, watchOS) when adding support for it.")
+    #endif
+    return osName
+}
+
 private func validatedHTTPResponse(_ response: URLResponse, data: Data) throws -> HTTPURLResponse {
     guard let httpResponse = response as? HTTPURLResponse else {
         throw HTTPClientError.invalidURLResponseError(response)
diff --git a/Sources/Gravatar/ProcessInfo+Additions.swift b/Sources/Gravatar/ProcessInfo+Additions.swift
new file mode 100644
index 00000000..22d91bf4
--- /dev/null
+++ b/Sources/Gravatar/ProcessInfo+Additions.swift
@@ -0,0 +1,7 @@
+import Foundation
+
+extension ProcessInfo {
+    var osVersionDottedString: String {
+        "\(operatingSystemVersion.majorVersion).\(operatingSystemVersion.minorVersion).\(operatingSystemVersion.patchVersion)"
+    }
+}