Yandex Browser user agent
Yandex Browser is a Chromium-based desktop and mobile browser developed by Yandex and widely used in Russia and neighbouring markets. Its user agent follows the standard Chrome structure with an added YaBrowser product token. It is a human browser and is distinct from the YandexBot search crawler.
What this means
Yandex Browser is built on Chromium, so it renders like Chrome and carries a Chrome-shaped user agent: Mozilla/5.0, a platform token, AppleWebKit and Chrome version markers, and Safari for compatibility. It adds a YaBrowser product token with its own version.
It is most common in Russia, Belarus, Kazakhstan, and other CIS markets, where Yandex is a major search and services provider. Seeing meaningful YaBrowser share usually reflects an audience in those regions.
Browser vs crawler
Do not confuse Yandex Browser (a human application) with YandexBot, the crawler for the Yandex search engine. The crawler self-identifies with its own token and a Yandex URL and should be treated as search-bot traffic; the browser is a human visit.
Match the human browser on the YaBrowser token and the crawler on its documented crawler token. Conflating them inflates either bot or human counts.
- Engine: Chromium (Chrome-pattern user agent)
- Distinguishing token: YaBrowser plus version
- Separate entity: YandexBot search crawler (not this page)
Regional context
Because Yandex Browser concentrates in specific markets, its share is a useful signal when you are evaluating whether content reaches Russian-speaking audiences. Pair it with the Accept-Language header rather than guessing language from the browser alone.
As with all Chromium browsers, prefer Client Hints for forward-compatible detection, since legacy user-agent detail is being reduced.
How it appears in analytics and logs
A Chrome-pattern user agent containing a YaBrowser token is a human using Yandex Browser. This is unrelated to YandexBot, which is the search crawler that self-identifies with a different token and a Yandex URL.
Diagnostic use case
Identify Yandex Browser visitors when analysing traffic from Russian-speaking regions, and avoid confusing the human browser with Yandex's search crawler.
What WebmasterID can help detect
WebmasterID classifies Yandex Browser as a human browser, keeping it separate from the YandexBot crawler in the bot-intelligence view, so search-engine crawl activity is not confused with human sessions from Yandex's browser.
Common mistakes
- Treating Yandex Browser (YaBrowser) traffic as the YandexBot crawler.
- Inferring exact location from the browser; it indicates a coarse market at best.
- Blocking the human browser when intending to control the search crawler.
Privacy and accuracy notes
Yandex Browser is recognised only from the user-agent token. WebmasterID treats the browser family and any coarse region as context, never as exact location or a personal identifier.
Related pages
- Chrome user agent and its quirks
Chrome's user-agent string is full of historical artefacts: it claims AppleWebKit and Safari for compatibility even though Chrome uses the Blink engine. Google has also reduced the detail Chrome exposes in the UA, moving fine-grained information into User-Agent Client Hints. This page explains the pattern and the quirks.
- Accept-Language vs user agent
Accept-Language and User-Agent are different HTTP headers that answer different questions. Accept-Language expresses the visitor's preferred languages and locales; User-Agent identifies the client software and platform. Mixing them up leads to wrong localisation and brittle detection. Both are client-supplied claims and can be absent or altered.
- Brave browser user agent
Brave is a privacy-focused Chromium browser that, by design, does not advertise itself in the user-agent string. It mirrors Chrome's user agent so sites cannot single Brave users out and to avoid breaking UA-sniffing sites. This page explains why Brave is hard to detect from the UA and why that is intentional.
- Bot intelligence
Deterministic separation of search crawlers from human browsers.
Sources and verification notes
- Yandex Browser — official siteChromium-based browser; YaBrowser product token in the UA.
Last reviewed 2026-06-24. Facts are checked against primary/official sources where available; uncertain specifics are marked “Data not yet verified” rather than guessed.