Privacy policy

Last updated: 23 October 2026

Deal Radar (radar.4xs.dev and the Deal Radar browser extension) is run by Pavel Kotyza, 4xs.dev. Contact: kotyza@gmail.com

Free mode: nothing leaves your browser

Without the paid plan, the extension works on its own: your watches, the listings it finds, your alerts and votes are kept only in your browser's extension storage. It loads the marketplaces' public search pages from your browser (without sending their cookies) and shows matches as browser notifications. Nothing is sent to radar.4xs.dev, and you have no account there. The one exception is the extension's Plan tab: when you open it, it asks radar.4xs.dev whether you are logged in and have a plan, and after you log in there, the extension asks the same every 5 minutes (for up to 30 days) so it can switch to the plan by itself. These requests carry only your radar.4xs.dev login cookie — no watches, listings or alerts.

What we store with the paid plan (after you log in with Telegram)

• Your Telegram account: user ID, name and username, received when you log in with Telegram. Used to identify your account and to send you alerts.
• Your watches: keywords, price limits, currency, selected sources and areas.
• Listings found by the server or your extension: title, price, link, source, time. Listings from Facebook groups are linked only to your account and are never shown to other users.
• The names and IDs of the Facebook groups you choose to let Deal Radar search.
• Your alerts and your Good/Junk votes, your plan (watches, paid until) and your Ko-fi payments (paid on Ko-fi; we receive the amount, your DR-code, name and the e-mail you use on Ko-fi, never card details).
• A session cookie for radar.4xs.dev.

What the extension does not do

• It does not read or send your Facebook login, cookies, messages, profile or browsing history.
• It only loads the search pages for your watches (some in one pinned tab). With the paid plan it sends the listings it finds to your Deal Radar account; in the free mode it keeps them in your browser.
• Its settings stay in your browser's extension storage.

Sharing

We do not sell your data. Data is processed by Cloudflare (hosting and database) and Telegram (message delivery). Nothing else is shared.

Retention and deletion

Data is kept while your account exists. Listings that never led to an alert are deleted after 30 days, expired logins right away. Write to kotyza@gmail.com to delete your account and all its data. Uninstalling the extension removes its local settings.