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GeminiiOS Undocumented Google User Agent

10/29/25
Source: Search Engine Roundtable by barry@rustybrick.com (Barry Schwartz). Read the original article

TL;DR Summary of Discovery of the Undocumented Google GeminiiOS User Agent

There is an undocumented Google user agent called GeminiiOS, linked to the Gemini app on iPhones. This user agent appears when users click source links within the app, opening pages inside its embedded WebView browser. It was first spotted by analyzing access logs and is not officially documented by Google. Understanding this user agent helps clarify traffic sources from the Gemini iOS app.

Optimixed’s Overview: Unveiling the GeminiiOS User Agent and Its Impact on Mobile Traffic Analysis

Background on GeminiiOS User Agent

Recently, a previously undocumented user agent string named GeminiiOS was identified. It is associated with Google’s Gemini app on iPhones and appears when users open links inside the app’s internal browser.

Details of the Discovery

  • Origin: Spotted by a researcher analyzing web server access logs.
  • Function: Represents visits coming from the embedded WebView inside the Gemini app on iOS devices.
  • User Agent Example: 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

Implications for SEO and Analytics

Understanding the GeminiiOS user agent is important for webmasters and analysts tracking traffic sources, as it identifies visits coming uniquely from the Gemini app’s in-app browser. This helps in:

  • Accurately segmenting mobile traffic from Gemini iOS users.
  • Adjusting marketing and SEO strategies based on app-driven visits.
  • Improving user experience by recognizing the context of access.

Overall, acknowledging this user agent enhances clarity in mobile traffic analysis and aids in better understanding how users interact with content via the Gemini app on iPhones.

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