Short version: nothing about you leaves your browser. There are no accounts, no sign-in and no server storing anything about you. There is no tracking, no analytics and no advertising anywhere on this site.
Your progress — which chart cells you have mastered, your accuracy heatmap, your counting streaks, your settings — is written to your own browser’s local storage and is never sent anywhere. It saves itself after every graded hand, and it is still there when you close the tab, quit the browser or restart the machine.
The trade-off is worth stating plainly: because the only copy is in this browser, clearing your browsing data deletes it, and it does not follow you to another device. Nobody — including us — has a copy to restore, because no copy was ever made.
There is no sign-in on this site, nothing to register for, and no server storing anything about you. No email address, no name, no identifier — there is no account record to hold any of it in.
Optional sign-in to sync progress between devices is built and may be switched on later. If it is, this page will describe exactly what it stores before it is offered to anyone, and it will stay optional — the trainer will always work without it.
Clear your browsing data for this site, or use your browser’s "clear site data" control. That is the whole procedure, because that is the only place anything is kept. There is nothing to email us about and no account to close.
The pages are served from Cloudflare, which as a matter of running any website sees the requests for them. Your progress is not there — it is in your browser, and it is never uploaded.
If what is stored ever changes, this page changes with it, and the change is visible in the site’s public commit history rather than announced by a banner nobody reads.
Back to the trainer No account needed, and none asked for.
There are no accounts. Nothing to register for and nothing to sign in to. Every drill works immediately and your progress saves itself in your own browser.
In your browser local storage, automatically, after every graded hand. It survives closing the tab, quitting the browser and restarting your computer. Because that is the only copy, clearing your browsing data deletes it and it does not transfer to another device.
No. There is no analytics of any kind, no advertising, and no cookies at all. The site also loads no third-party scripts, which its Content-Security-Policy enforces.
Clear your browsing data for this site. That is the entire procedure, because your browser is the only place anything is stored. There is no account to close and nobody to email.