Cookies and preferences

Updated 1 October 2026. The application uses one cookie for the language you choose.

Language cookie

jost_locale contains only ru or en. It is created when you manually switch language, lasts up to 180 days and is limited to this host and the entire site path. It uses Secure on HTTPS and SameSite=Lax. The cookie contains no user identifier, IP address or browsing history. It remembers the language preference you requested.

Managing your choice

The RU / EN switch changes the preference. The button below deletes the cookie; the next visit to the root address will choose language by country, then browser language. You can also remove the cookie in browser settings. If cookies are blocked, the switch still opens the selected version, but the choice may not survive between visits.

Other preferences

RUB / USD selection and demo actions exist only in the open page’s memory. The application does not use localStorage, sessionStorage, advertising or analytics cookies. The public site does not load Vercel Analytics or Speed Insights scripts. Hosting infrastructure and external Telegram have their own data handling terms: Vercel, Telegram. Cookies on external services after you follow a link are not cookies set by this application.