diff --git a/package.json b/package.json
index c1c159d0..e8234cc8 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,7 @@
     "react-dom": "19.2.4",
     "react-icons": "^5.6.0",
     "stripe": "^22.2.1",
+    "ua-parser-js": "^2.0.10",
     "unstorage": "^1.17.5",
     "xstate": "^5",
     "zod": "^4.4.3"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 57fde0b2..9745eeaa 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -53,6 +53,9 @@ importers:
       stripe:
         specifier: ^22.2.1
         version: 22.2.1(@types/node@20.19.41)
+      ua-parser-js:
+        specifier: ^2.0.10
+        version: 2.0.10
       unstorage:
         specifier: ^1.17.5
         version: 1.17.5
@@ -1639,6 +1642,9 @@ packages:
   destr@2.0.5:
     resolution: {integrity: sha512-ugFTXCtDZunbzasqBxrK93Ik/DRYsO6S/fedkWEMKqt04xZ4csmnmwGDBAb07QWNaGMAmnTIemsYZCksjATwsA==}
 
+  detect-europe-js@0.1.2:
+    resolution: {integrity: sha512-lgdERlL3u0aUdHocoouzT10d9I89VVhk0qNRmll7mXdGfJT1/wqZ2ZLA4oJAjeACPY5fT1wsbq2AT+GkuInsow==}
+
   detect-libc@2.1.2:
     resolution: {integrity: sha512-Btj2BOOO83o3WyH59e8MgXsxEQVcarkUOpEYrubB0urwnN10yQ364rsiByU11nZlqWYZm05i/of7io4mzihBtQ==}
     engines: {node: '>=8'}
@@ -2147,6 +2153,9 @@ packages:
     resolution: {integrity: sha512-ISWac8drv4ZGfwKl5slpHG9OwPNty4jOWPRIhBpxOoD+hqITiwuipOQ2bNthAzwA3B4fIjO4Nln74N0S9byq8A==}
     engines: {node: '>= 0.4'}
 
+  is-standalone-pwa@0.1.1:
+    resolution: {integrity: sha512-9Cbovsa52vNQCjdXOzeQq5CnCbAcRk05aU62K20WO372NrTv0NxibLFCK6lQ4/iZEFdEA3p3t2VNOn8AJ53F5g==}
+
   is-string@1.1.1:
     resolution: {integrity: sha512-BtEeSsoaQjlSPBemMQIrY1MY0uM6vnS1g5fmufYOtnxLGUZM2178PKbhsk7Ffv58IX+ZtcvoGwccYsh0PglkAA==}
     engines: {node: '>= 0.4'}
@@ -3081,6 +3090,13 @@ packages:
     engines: {node: '>=14.17'}
     hasBin: true
 
+  ua-is-frozen@0.1.2:
+    resolution: {integrity: sha512-RwKDW2p3iyWn4UbaxpP2+VxwqXh0jpvdxsYpZ5j/MLLiQOfbsV5shpgQiw93+KMYQPcteeMQ289MaAFzs3G9pw==}
+
+  ua-parser-js@2.0.10:
+    resolution: {integrity: sha512-t+3Ktbq0Ies2vaSezfOaWiolH4OigQIO1dk+1xDpOydB1COVPocVYOrEV5rqZ0kFY9XYG1v9LutCyMgYBpABcw==}
+    hasBin: true
+
   ufo@1.6.4:
     resolution: {integrity: sha512-JFNbkD1Svwe0KvGi8GOeLcP4kAWQ609twvCdcHxq1oSL8svv39ZuSvajcD8B+5D0eL4+s1Is2D/O6KN3qcTeRA==}
 
@@ -4689,6 +4705,8 @@ snapshots:
 
   destr@2.0.5: {}
 
+  detect-europe-js@0.1.2: {}
+
   detect-libc@2.1.2: {}
 
   dexie@4.4.3: {}
@@ -5365,6 +5383,8 @@ snapshots:
     dependencies:
       call-bound: 1.0.4
 
+  is-standalone-pwa@0.1.1: {}
+
   is-string@1.1.1:
     dependencies:
       call-bound: 1.0.4
@@ -6359,6 +6379,14 @@ snapshots:
 
   typescript@5.9.3: {}
 
+  ua-is-frozen@0.1.2: {}
+
+  ua-parser-js@2.0.10:
+    dependencies:
+      detect-europe-js: 0.1.2
+      is-standalone-pwa: 0.1.1
+      ua-is-frozen: 0.1.2
+
   ufo@1.6.4: {}
 
   unbox-primitive@1.1.0:
diff --git a/src/utils/browser-detect.ts b/src/utils/browser-detect.ts
index 84693f84..3e814c2e 100644
--- a/src/utils/browser-detect.ts
+++ b/src/utils/browser-detect.ts
@@ -1,26 +1,142 @@
+import { UAParser } from "ua-parser-js";
+
+export type InAppBrowserName =
+  | "facebook"
+  | "instagram"
+  | "wechat"
+  | "weibo"
+  | "qq"
+  | "line"
+  | "tiktok"
+  | "webview"
+  | "unknown";
+
+export interface BrowserInfo {
+  name: string;
+  version: string;
+  major: string;
+  engineName: string;
+  engineVersion: string;
+  isInAppBrowser: boolean;
+  inAppBrowserName: InAppBrowserName | null;
+  userAgent: string;
+}
+
 /**
  * 浏览器 / WebView 检测
+ *
+ * 只放浏览器相关能力。OS / 设备 / 平台检测请使用 `PlatformDetector`。
  */
-export const BrowserDetector = {
+export class BrowserDetector {
+  private constructor() {}
+
+  static getBrowserInfo(ua: string | null = null): BrowserInfo {
+    const userAgent = BrowserDetector.getUserAgent(ua);
+    const result = new UAParser(userAgent).getResult();
+    const inAppBrowserName = BrowserDetector.getInAppBrowserName(userAgent);
+
+    return {
+      name: result.browser.name ?? "",
+      version: result.browser.version ?? "",
+      major: result.browser.major ?? "",
+      engineName: result.engine.name ?? "",
+      engineVersion: result.engine.version ?? "",
+      isInAppBrowser: inAppBrowserName !== null,
+      inAppBrowserName,
+      userAgent,
+    };
+  }
+
+  static getBrowserName(ua: string | null = null): string {
+    return BrowserDetector.getBrowserInfo(ua).name;
+  }
+
+  static getBrowserVersion(ua: string | null = null): string {
+    return BrowserDetector.getBrowserInfo(ua).version;
+  }
+
+  static isChrome(ua: string | null = null): boolean {
+    return /Chrome|CriOS/i.test(BrowserDetector.getBrowserName(ua));
+  }
+
+  static isSafari(ua: string | null = null): boolean {
+    return /Safari/i.test(BrowserDetector.getBrowserName(ua));
+  }
+
+  static isEdge(ua: string | null = null): boolean {
+    return /Edge/i.test(BrowserDetector.getBrowserName(ua));
+  }
+
   /** 当前是否在 Facebook 内嵌浏览器 */
-  isFacebookInAppBrowser(ua: string | null = null): boolean {
-    if (typeof navigator === "undefined" && !ua) return false;
-    const userAgent = ua ?? (typeof navigator !== "undefined" ? navigator.userAgent : "");
-    return /FBAN|FBAV|Instagram/i.test(userAgent);
-  },
+  static isFacebookInAppBrowser(ua: string | null = null): boolean {
+    return /FBAN|FBAV|FB_IAB|FB4A|FBIOS/i.test(BrowserDetector.getUserAgent(ua));
+  }
+
+  /** 当前是否在 Instagram 内嵌浏览器 */
+  static isInstagramInAppBrowser(ua: string | null = null): boolean {
+    return /Instagram/i.test(BrowserDetector.getUserAgent(ua));
+  }
 
   /** 当前是否在微信内嵌浏览器 */
-  isWeChatInAppBrowser(ua: string | null = null): boolean {
-    if (typeof navigator === "undefined" && !ua) return false;
-    const userAgent = ua ?? (typeof navigator !== "undefined" ? navigator.userAgent : "");
-    return /MicroMessenger/i.test(userAgent);
-  },
+  static isWeChatInAppBrowser(ua: string | null = null): boolean {
+    return /MicroMessenger/i.test(BrowserDetector.getUserAgent(ua));
+  }
+
+  /** 当前是否在微博内嵌浏览器 */
+  static isWeiboInAppBrowser(ua: string | null = null): boolean {
+    return /Weibo/i.test(BrowserDetector.getUserAgent(ua));
+  }
+
+  /** 当前是否在 QQ 内嵌浏览器 */
+  static isQQInAppBrowser(ua: string | null = null): boolean {
+    return /QQ\//i.test(BrowserDetector.getUserAgent(ua));
+  }
+
+  /** 当前是否在 Line 内嵌浏览器 */
+  static isLineInAppBrowser(ua: string | null = null): boolean {
+    return /Line\//i.test(BrowserDetector.getUserAgent(ua));
+  }
+
+  /** 当前是否在 TikTok 内嵌浏览器 */
+  static isTikTokInAppBrowser(ua: string | null = null): boolean {
+    return /BytedanceWebview|TikTok|Musical_ly/i.test(
+      BrowserDetector.getUserAgent(ua),
+    );
+  }
 
   /** 当前是否在 WebView（不通用；仅作 best-effort 判断） */
-  isInAppBrowser(ua: string | null = null): boolean {
-    if (typeof navigator === "undefined" && !ua) return false;
-    const userAgent = ua ?? (typeof navigator !== "undefined" ? navigator.userAgent : "");
-    return /WebView|; wv\)|FBAN|FBAV|MicroMessenger|Instagram|Line\//i.test(userAgent);
-  },
+  static isWebView(ua: string | null = null): boolean {
+    const userAgent = BrowserDetector.getUserAgent(ua);
+    return (
+      /WebView|; wv\)/i.test(userAgent) ||
+      (/iPhone|iPad|iPod/i.test(userAgent) &&
+        /AppleWebKit/i.test(userAgent) &&
+        !/Safari/i.test(userAgent))
+    );
+  }
 
-};
+  /** 当前是否在应用内浏览器 */
+  static isInAppBrowser(ua: string | null = null): boolean {
+    return BrowserDetector.getInAppBrowserName(ua) !== null;
+  }
+
+  static getInAppBrowserName(
+    ua: string | null = null,
+  ): InAppBrowserName | null {
+    if (BrowserDetector.isFacebookInAppBrowser(ua)) return "facebook";
+    if (BrowserDetector.isInstagramInAppBrowser(ua)) return "instagram";
+    if (BrowserDetector.isWeChatInAppBrowser(ua)) return "wechat";
+    if (BrowserDetector.isWeiboInAppBrowser(ua)) return "weibo";
+    if (BrowserDetector.isQQInAppBrowser(ua)) return "qq";
+    if (BrowserDetector.isLineInAppBrowser(ua)) return "line";
+    if (BrowserDetector.isTikTokInAppBrowser(ua)) return "tiktok";
+    if (BrowserDetector.isWebView(ua)) return "webview";
+    return null;
+  }
+
+  private static getUserAgent(ua: string | null = null): string {
+    if (ua) return ua;
+    if (typeof navigator === "undefined") return "";
+    return navigator.userAgent;
+  }
+}
diff --git a/src/utils/platform-detect.ts b/src/utils/platform-detect.ts
new file mode 100644
index 00000000..d512377d
--- /dev/null
+++ b/src/utils/platform-detect.ts
@@ -0,0 +1,98 @@
+import { UAParser } from "ua-parser-js";
+
+export type PlatformName = "ios" | "android" | "desktop" | "unknown";
+
+export interface PlatformInfo {
+  platform: PlatformName;
+  osName: string;
+  osVersion: string;
+  deviceType: string;
+  deviceVendor: string;
+  deviceModel: string;
+  cpuArchitecture: string;
+  isMobile: boolean;
+  isTablet: boolean;
+  isDesktop: boolean;
+  isIOS: boolean;
+  isAndroid: boolean;
+  userAgent: string;
+}
+
+/**
+ * 平台 / OS / 设备检测
+ *
+ * 与浏览器内核、内置浏览器判断解耦；浏览器相关能力请使用 `BrowserDetector`。
+ */
+export class PlatformDetector {
+  private constructor() {}
+
+  static getPlatformInfo(ua: string | null = null): PlatformInfo {
+    const userAgent = PlatformDetector.getUserAgent(ua);
+    const result = new UAParser(userAgent).getResult();
+    const osName = result.os.name ?? "";
+    const deviceType = result.device.type ?? "";
+    const isIOS = PlatformDetector.isIOS(userAgent);
+    const isAndroid = PlatformDetector.isAndroid(userAgent);
+    const isTablet = deviceType === "tablet" || PlatformDetector.isIPadOS();
+    const isMobile = deviceType === "mobile" || isTablet;
+
+    return {
+      platform: PlatformDetector.getPlatform(userAgent),
+      osName,
+      osVersion: result.os.version ?? "",
+      deviceType,
+      deviceVendor: result.device.vendor ?? "",
+      deviceModel: result.device.model ?? "",
+      cpuArchitecture: result.cpu.architecture ?? "",
+      isMobile,
+      isTablet,
+      isDesktop: !isMobile,
+      isIOS,
+      isAndroid,
+      userAgent,
+    };
+  }
+
+  static getPlatform(ua: string | null = null): PlatformName {
+    const userAgent = PlatformDetector.getUserAgent(ua);
+    if (PlatformDetector.isIOS(userAgent)) return "ios";
+    if (PlatformDetector.isAndroid(userAgent)) return "android";
+    if (userAgent.length > 0) return "desktop";
+    return "unknown";
+  }
+
+  static isIOS(ua: string | null = null): boolean {
+    const userAgent = PlatformDetector.getUserAgent(ua);
+    const osName = new UAParser(userAgent).getOS().name ?? "";
+    return /iOS/i.test(osName) || PlatformDetector.isIPadOS();
+  }
+
+  static isAndroid(ua: string | null = null): boolean {
+    const userAgent = PlatformDetector.getUserAgent(ua);
+    const osName = new UAParser(userAgent).getOS().name ?? "";
+    return /Android/i.test(osName) || /Android/i.test(userAgent);
+  }
+
+  static isMobile(ua: string | null = null): boolean {
+    return PlatformDetector.getPlatformInfo(ua).isMobile;
+  }
+
+  static isTablet(ua: string | null = null): boolean {
+    return PlatformDetector.getPlatformInfo(ua).isTablet;
+  }
+
+  static isDesktop(ua: string | null = null): boolean {
+    return PlatformDetector.getPlatformInfo(ua).isDesktop;
+  }
+
+  private static getUserAgent(ua: string | null = null): string {
+    if (ua) return ua;
+    if (typeof navigator === "undefined") return "";
+    return navigator.userAgent;
+  }
+
+  private static isIPadOS(): boolean {
+    if (typeof navigator === "undefined") return false;
+    return navigator.platform === "MacIntel" && (navigator.maxTouchPoints ?? 0) > 1;
+  }
+}
diff --git a/src/utils/url-launcher-util.ts b/src/utils/url-launcher-util.ts
new file mode 100644
index 00000000..fe15843e
--- /dev/null
+++ b/src/utils/url-launcher-util.ts
@@ -0,0 +1,84 @@
+import { PlatformDetector } from "./platform-detect";
+
+/**
+ * URL 打开工具类
+ *
+ * 对齐 Flutter 端 `lib/utils/url_launcher_util.dart`：
+ * - Android: 使用 Chrome Intent URL 尝试跳出应用内浏览器
+ * - iOS: 使用 Safari URL scheme 尝试跳出应用内浏览器
+ * - 其他平台: 使用普通新窗口打开，失败时回退到当前页跳转
+ */
+export type UrlQueryParams = Record<string, string>;
+
+export class UrlLauncherUtil {
+  private constructor() {}
+
+  static openUrlWithExternalBrowser(
+    url: string,
+    options: { queryParams?: UrlQueryParams } = {},
+  ): void {
+    if (typeof window === "undefined") return;
+
+    const finalUrl = UrlLauncherUtil.appendQueryParams(
+      UrlLauncherUtil.toAbsoluteUrl(url),
+      options.queryParams,
+    );
+
+    if (PlatformDetector.isAndroid()) {
+      window.location.href = UrlLauncherUtil.buildIntentUrl(finalUrl);
+      return;
+    }
+
+    if (PlatformDetector.isIOS()) {
+      window.location.href = UrlLauncherUtil.buildSafariUrl(finalUrl);
+      return;
+    }
+
+    UrlLauncherUtil.openUrl(finalUrl);
+  }
+
+  static openUrl(url: string): void {
+    if (typeof window === "undefined") return;
+
+    const finalUrl = UrlLauncherUtil.toAbsoluteUrl(url);
+    const opened = window.open(finalUrl, "_blank", "noopener,noreferrer");
+    if (!opened) {
+      window.location.href = finalUrl;
+    }
+  }
+
+  static appendQueryParams(
+    url: string,
+    queryParams?: UrlQueryParams,
+  ): string {
+    if (!queryParams || Object.keys(queryParams).length === 0) return url;
+
+    const uri = new URL(url, UrlLauncherUtil.getBaseUrl());
+    for (const [key, value] of Object.entries(queryParams)) {
+      uri.searchParams.set(key, value);
+    }
+    return uri.toString();
+  }
+
+  static buildIntentUrl(url: string): string {
+    const uri = new URL(url, UrlLauncherUtil.getBaseUrl());
+    const scheme = uri.protocol.replace(":", "") || "https";
+    const path = `${uri.pathname}${uri.search}`;
+    return `intent://${uri.host}${path}#Intent;scheme=${scheme};package=com.android.chrome;end`;
+  }
+
+  static buildSafariUrl(url: string): string {
+    const uri = new URL(url, UrlLauncherUtil.getBaseUrl());
+    const path = `${uri.pathname}${uri.search}`;
+    return `x-safari-https://${uri.host}${path}`;
+  }
+
+  private static toAbsoluteUrl(url: string): string {
+    return new URL(url, UrlLauncherUtil.getBaseUrl()).toString();
+  }
+
+  private static getBaseUrl(): string {
+    if (typeof window !== "undefined") return window.location.origin;
+    return "https://cozsweet.com";
+  }
+}