Temporary files installed by Yandex Metrica

Yandex Metrica provides depersonalized information about your site's traffic. The available statistics include the number of users, traffic sources, and user behavior on site pages. In order to count the site’s users, Yandex Metrica uses anonymous browser identifiers that are stored in cookies or in localStorage properties. These cookies and properties are set on the top-level domain such as .example.com.

Name	Type	Period of validity	Description	Domain where it is set
`_ym_metrika_enabled`	Analytical	60 minutes	Checks whether other Yandex Metrica cookies are installed correctly	The domain where the tag is installed
`_ym_isad`		2 days	Used to determine if a visitor has ad blockers
`_ym_uid`		1 year	Used for identifying site users
`_ym_d`			Saves the date of the user’s first site session
`_ym_ucs`			Source for `_ym_uid`. It appears if you enable server-side cookie resetting
`gdpr`	Technical	Up to 2 years	Used for identifying users who fall under the General Data Protection Regulation (GDPR) jurisdiction
`_ym_debug`	Technical	Until the session ends	Indicates that debug mode is active
`_ym_visorc_*`	Analytical	30 minutes	Allows Session Replay to function correctly
`_ym_hostIndex`	Analytical	1 day	Limits the number of requests
`_ym_sup_debug`	Technical	1 day	Used for debugging Yandex Metrica tags
`is_gdpr`	Technical	Up to 2 years	Used for identifying users who fall under the General Data Protection Regulation (GDPR) jurisdiction	All Yandex Metrica domains
`is_gdpr_b`	Technical	Up to 2 years	Used for identifying users who fall under the General Data Protection Regulation (GDPR) jurisdiction
`yabs-sid`	Technical	Within the browser session	Session ID
`i`	Technical	1 year	Used for identifying site users
`yandexuid`		1 year (in some countries, the period may be longer)
`yuidss`		1 year (in some countries, the period may be longer)
`ymex`	Analytical	1 year	Stores auxiliary information for Yandex Metrica operation: IDs' creation time and alternative values.
`usst`	Analytical	1 year	Stores auxiliary information for syncing site user IDs between different Yandex domains

localStorage

These properties are set on the domain where the Yandex Metrica tag is embedded.

Name	Description
`_ym<tag ID>_lastHit`	Used for specifying the time in order to get an accurate bounce rate
`_ym<tag ID>_lsid`	Used for identifying site users
`_ym<tag ID>_reqNum`	Used for determining the ordinal number of the request from the Yandex Metrica tag in the browser
`_ym_hide_phones`	Allows hiding phone numbers
`_ym_retryReqs`	Contains requests that the tag couldn’t send to the server
`_ym_uid`	Used for identifying site users
`zz`	Used for identifying site users

sessionStorage

Name	Type	Description	Domain where it is set
`_ym_debugger_state`	Technical	Used for debugging Yandex Metrica tags	The domain where the tag is installed
`_ym_turbo_uid`	Technical	Distinguishes between users on Turbo pages	The domain where the tag is installed

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Please note: Our support team will never initiate a call to you. Do not follow any instructions of people who call you and introduce themselves as the Yandex Metrica support team.

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Data transfer restrictions

IDs in Yandex Metrica (ClientID and UserID)