Questions worth asking first

What happens when I reach a limit?

That one feature pauses and everything else keeps working. Run out of submissions and you can still read problems, use the assistant and take quests — the judge comes back at midnight. Nothing is deleted and nothing is charged.

Is the Free plan a trial?

No. It is free indefinitely, with no card and no expiry. You get the whole problem library, the daily challenge, streaks, ranking and your full solve history, plus 3 judged submissions a day and one generated problem a month.

Can I cancel, and what happens if I do?

Cancel from your settings in two clicks. Pro stays active until the end of the month you have already paid for, then the account moves to Free. Your problems, lists and history stay exactly as they are.

Can I pay for a single month?

Yes. Turn off "Renew every month" before checkout and you are charged once, for one month. You can switch renewal back on at any point from your settings.

What counts against the AI token allowance?

Only your conversations with the CodeMaster assistant inside a problem. Generating problems and having a submission judged do not spend it — those have their own limits.