Every plan runs the same Stockfish, locally, in your browser. The only difference is how many positions you can analyze per day.
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Each position the extension analyzes on Chess.com or Lichess counts once, whether you press Analyze or Continuous analysis runs it for you. Full-game reviews, puzzles and the Mistake Trainer on this site don't count.
Every day at midnight UTC. The extension's on-board panel shows how many you have left after each analysis, and your account page shows today's usage.
Analysis pauses until the reset. Nothing else changes: your reviews, puzzles and progress stay available. Upgrading takes effect as soon as checkout completes, so you can keep going straight away.
Make sure you signed in here with the same Google account the extension uses (you can see it in the extension's popup). Plans belong to the account, not the browser.
Yes, any time from your account page via Manage billing. Cancelling keeps your paid limit until the end of the period you've paid for, then you drop to Free.
No. Stockfish runs entirely inside your browser. The only thing the server sees is a counter of how many positions you've analyzed today.
