"While Natzir was analyzing his access logs, he found an undocumented user agent string "GeminiiOS" that didn't appear anywhere in Google's or public documentation. After he did some digging, he was able to confirm that it corresponds to visits generated from the WebView embedded inside the Gemini app on iOS. The example user agent Nazir sent me was: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 GoogleWv/1.0 (WKWebView) GeminiiOS/1.2025.4170000"
"This means that when a user is using Google's Gemini app on their iPhone and clicks on a source or link, the page opens within the app's internal browser is identified under the user agent of GeminiiOS. He shared this on X: He even sent me a screenshot of what the web view looks like for this site when this user agent is used: So if you see it, that is what it likely is. Forum discussion at X."
An undocumented user agent string 'GeminiiOS' appeared in server access logs and did not match Google's public documentation. Analysis confirmed that the user agent corresponds to visits generated from the WebView embedded inside the Gemini iOS app. When a user clicks a source or link in the Gemini iOS app, the linked page opens within the app's internal browser and is reported under the GeminiiOS user agent. The example user agent includes GeminiiOS/1.2025.4170000 alongside WKWebView and GoogleWv identifiers. A screenshot of the in-app web view and related discussion were shared on X.
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