Microsoft Edge user agent strings

On every platform Edge 155 also sends Sec-CH-UA: "Microsoft Edge";v="155", "Chromium";v="155", "Not(A:Brand";v="24". When a site asks for the full version (Sec-CH-UA-Full-Version-List), the Microsoft Edge entry carries Edge's own build number (155.0.4283.62), which is not Chrome's build number at the same major.

The Windows string and its brand list match what we measured on Edge 153; the other platforms follow Chromium's frozen platform tokens, which Edge does not change, and Microsoft's documented EdgA format on Android.

Because the brand list is computed from the major version, Chrome 155 and Edge 155 put their brands in the same order. The Chrome user agent page explains the algorithm and has a generator that also produces Edge's headers for any version.

Android: Edge uses Chromium's reduced Android string, Linux; Android 10; K, whatever the device, and adds EdgA/155.0.0.0. The real Android version and the model are in Sec-CH-UA-Platform-Version and Sec-CH-UA-Model, sent only when a site asks. See Android user agents.

iPhone and iPad: Edge runs on Apple's WebKit, sends no Client Hints, and marks its string with EdgiOS/ and the app version (currently 155.4283.61 on the App Store). We have not verified the rest of the current EdgiOS string on a device, so it is not in the table; the other iOS browsers are on the iPhone user agent page.

• In the string: Edg/, EdgA/ or EdgiOS/. A string with only Chrome/ is Chrome or another Chromium browser; Edge/ with no a is the legacy EdgeHTML browser.
• In the headers: "Microsoft Edge" in Sec-CH-UA. A string that says Edg/ with a brand list that says Google Chrome, or no brand list at all over HTTPS, did not come from Edge.
• Not the engine: Edge and Chrome of the same major share the Blink engine, so feature tests cannot separate them. Microsoft itself recommends checking for the Chromium brand when what you care about is the engine.

Compare with the base it is built on: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Safari/537.36 is Chrome 155 on Windows.