diff --git a/packages-exp/auth-exp/src/core/util/browser.test.ts b/packages-exp/auth-exp/src/core/util/browser.test.ts
new file mode 100644
index 00000000000..8a99a13a49a
--- /dev/null
+++ b/packages-exp/auth-exp/src/core/util/browser.test.ts
@@ -0,0 +1,99 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { expect } from 'chai';
+import { getBrowserName, BrowserName } from './browser';
+
+describe('getBrowserName', () => {
+  it('should recognize Opera', () => {
+    const userAgent =
+      'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36 OPR/36.0.2130.74';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.OPERA);
+  });
+
+  it('should recognize IE', () => {
+    const userAgent =
+      'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.IE);
+  });
+
+  it('should recognize Edge', () => {
+    const userAgent =
+      'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.EDGE);
+  });
+
+  it('should recognize Firefox', () => {
+    const userAgent =
+      'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.FIREFOX);
+  });
+
+  it('should recognize Silk', () => {
+    const userAgent =
+      'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Silk/44.1.54 like Chrome/44.0.2403.63 Safari/537.36';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.SILK);
+  });
+
+  it('should recognize Safari', () => {
+    const userAgent =
+      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11-4) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.SAFARI);
+  });
+
+  it('should recognize Chrome', () => {
+    const userAgent =
+      'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.CHROME);
+  });
+
+  it('should recognize Android', () => {
+    const userAgent =
+      'Mozilla/5.0 (Linux; U; Android 4.0.3; ko-kr; LG-L160L Build/IML74K) AppleWebkit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.ANDROID);
+  });
+
+  it('should recognize Blackberry', () => {
+    const userAgent =
+      'Mozilla/5.0 (BlackBerry; U; BlackBerry 9900; en) AppleWebKit/534.11+ (KHTML, like Gecko) Version/7.1.0.346 Mobile Safari/534.11+';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.BLACKBERRY);
+  });
+
+  it('should recognize IE Mobile', () => {
+    const userAgent =
+      'Mozilla/5.0 (compatible; MSIE 10.0; Windows Phone 8.0;Trident/6.0; IEMobile/10.0; ARM; Touch; NOKIA; Lumia 920)';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.IEMOBILE);
+  });
+
+  it('should recognize WebOS', () => {
+    const userAgent =
+      'Mozilla/5.0 (webOS/1.3; U; en-US) AppleWebKit/525.27.1 (KHTML, like Gecko) Version/1.0 Safari/525.27.1 Desktop/1.0';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.WEBOS);
+  });
+
+  it('should recognize an unlisted browser', () => {
+    const userAgent =
+      'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Awesome/2.0.012';
+    expect(getBrowserName(userAgent)).to.eq('Awesome');
+  });
+
+  it('should default to Other', () => {
+    const userAgent =
+      'Mozilla/5.0 (iPhone; CPU iPhone OS 8_2 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Mobile/12D508 [FBAN/FBIOS;FBAV/27.0.0.10.12;FBBV/8291884;FBDV/iPhone7,1;FBMD/iPhone;FBSN/iPhone OS;FBSV/8.2;FBSS/3; FBCR/vodafoneIE;FBID/phone;FBLC/en_US;FBOP/5]';
+    expect(getBrowserName(userAgent)).to.eq(BrowserName.OTHER);
+  });
+});
diff --git a/packages-exp/auth-exp/src/core/util/browser.ts b/packages-exp/auth-exp/src/core/util/browser.ts
new file mode 100644
index 00000000000..5020f00a447
--- /dev/null
+++ b/packages-exp/auth-exp/src/core/util/browser.ts
@@ -0,0 +1,84 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Enums for Browser name.
+ */
+export enum BrowserName {
+  ANDROID = 'Android',
+  BLACKBERRY = 'Blackberry',
+  EDGE = 'Edge',
+  FIREFOX = 'Firefox',
+  IE = 'IE',
+  IEMOBILE = 'IEMobile',
+  OPERA = 'Opera',
+  OTHER = 'Other',
+  CHROME = 'Chrome',
+  SAFARI = 'Safari',
+  SILK = 'Silk',
+  WEBOS = 'Webos'
+}
+
+/**
+ * Determine the browser for the purposes of reporting usage to the API
+ */
+export function getBrowserName(userAgent: string): BrowserName | string {
+  const ua = userAgent.toLowerCase();
+  if (ua.includes('opera/') || ua.includes('opr/') || ua.includes('opios/')) {
+    return BrowserName.OPERA;
+  } else if (ua.includes('iemobile')) {
+    // Windows phone IEMobile browser.
+    return BrowserName.IEMOBILE;
+  } else if (ua.includes('msie') || ua.includes('trident/')) {
+    return BrowserName.IE;
+  } else if (ua.includes('edge/')) {
+    return BrowserName.EDGE;
+  } else if (ua.includes('firefox/')) {
+    return BrowserName.FIREFOX;
+  } else if (ua.includes('silk/')) {
+    return BrowserName.SILK;
+  } else if (ua.includes('blackberry')) {
+    // Blackberry browser.
+    return BrowserName.BLACKBERRY;
+  } else if (ua.includes('webos')) {
+    // WebOS default browser.
+    return BrowserName.WEBOS;
+  } else if (
+    ua.includes('safari/') &&
+    !ua.includes('chrome/') &&
+    !ua.includes('crios/') &&
+    !ua.includes('android')
+  ) {
+    return BrowserName.SAFARI;
+  } else if (
+    (ua.includes('chrome/') || ua.includes('crios/')) &&
+    !ua.includes('edge/')
+  ) {
+    return BrowserName.CHROME;
+  } else if (ua.includes('android')) {
+    // Android stock browser.
+    return BrowserName.ANDROID;
+  } else {
+    // Most modern browsers have name/version at end of user agent string.
+    const re = /([a-zA-Z\d\.]+)\/[a-zA-Z\d\.]*$/;
+    const matches = userAgent.match(re);
+    if (matches?.length === 2) {
+      return matches[1];
+    }
+  }
+  return BrowserName.OTHER;
+}
diff --git a/packages-exp/auth-exp/src/core/util/version.test.ts b/packages-exp/auth-exp/src/core/util/version.test.ts
new file mode 100644
index 00000000000..eea1c2ffe55
--- /dev/null
+++ b/packages-exp/auth-exp/src/core/util/version.test.ts
@@ -0,0 +1,46 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { SDK_VERSION } from '@firebase/app-exp';
+import { expect } from 'chai';
+import { ClientPlatform, getClientVersion } from './version';
+
+describe('getClientVersion', () => {
+  context('browser', () => {
+    it('should set the correct version', () => {
+      expect(getClientVersion(ClientPlatform.BROWSER)).to.eq(
+        `Chrome/JsCore/${SDK_VERSION}/FirebaseCore-web`
+      );
+    });
+  });
+
+  context('worker', () => {
+    it('should set the correct version', () => {
+      expect(getClientVersion(ClientPlatform.WORKER)).to.eq(
+        `Chrome-Worker/JsCore/${SDK_VERSION}/FirebaseCore-web`
+      );
+    });
+  });
+
+  context('React Native', () => {
+    it('should set the correct version', () => {
+      expect(getClientVersion(ClientPlatform.REACT_NATIVE)).to.eq(
+        `ReactNative/JsCore/${SDK_VERSION}/FirebaseCore-web`
+      );
+    });
+  });
+});
diff --git a/packages-exp/auth-exp/src/core/util/version.ts b/packages-exp/auth-exp/src/core/util/version.ts
new file mode 100644
index 00000000000..470213e764f
--- /dev/null
+++ b/packages-exp/auth-exp/src/core/util/version.ts
@@ -0,0 +1,61 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { SDK_VERSION } from '@firebase/app-exp';
+import { getBrowserName } from './browser';
+import { getUA } from '@firebase/util';
+
+const CLIENT_IMPLEMENTATION = 'JsCore';
+
+export enum ClientPlatform {
+  BROWSER = 'Browser',
+  NODE = 'Node',
+  REACT_NATIVE = 'ReactNative',
+  WORKER = 'Worker'
+}
+
+enum ClientFramework {
+  // No other framework used.
+  DEFAULT = 'FirebaseCore-web',
+  // Firebase Auth used with FirebaseUI-web.
+  // TODO: Pass this in when used in conjunction with FirebaseUI
+  FIREBASEUI = 'FirebaseUI-web'
+}
+
+/*
+ * Determine the SDK version string
+ *
+ * TODO: This should be set on the Auth object during initialization
+ */
+export function getClientVersion(clientPlatform: ClientPlatform): string {
+  let reportedPlatform: string;
+  switch (clientPlatform) {
+    case ClientPlatform.BROWSER:
+      // In a browser environment, report the browser name.
+      reportedPlatform = getBrowserName(getUA());
+      break;
+    case ClientPlatform.WORKER:
+      // Technically a worker runs from a browser but we need to differentiate a
+      // worker from a browser.
+      // For example: Chrome-Worker/JsCore/4.9.1/FirebaseCore-web.
+      reportedPlatform = `${getBrowserName(getUA())}-${clientPlatform}`;
+      break;
+    default:
+      reportedPlatform = clientPlatform;
+  }
+  return `${reportedPlatform}/${CLIENT_IMPLEMENTATION}/${SDK_VERSION}/${ClientFramework.DEFAULT}`;
+}