Open the app → click Upgrade in the left sidebar → click "Manage subscription". This opens our payment partner's billing portal where you can cancel, change your card, or switch tiers.
Cancelling stops future charges. You keep access until the end of the period you've already paid for. After that you drop back to Free. If you separately own Pro ($19.99 lifetime), that stays.
Switching between AI Focus and AI Focus Max happens inside the app, from Usage on the AI Focus page. Moving up happens straight away, with the difference charged today; moving down happens at your next renewal, with no refund.
On the AI Focus free trial? Cancel it from Usage on the AI Focus page. You keep the trial until its end date and nothing is charged.