You can cancel your Pro subscription anytime from Settings → Billing → Manage Billing. Cancellation takes effect at the end of your current billing period — you keep full Pro access until then, with no early cutoff.
There are no cancellation fees, and no long-term commitment — plans are billed month-to-month.
Cancelling downgrades your account to the Free plan; it does not delete your data. Your customers, maintenance schedules, and history stay exactly as they were. If you're over the Free plan's limits when you downgrade, nothing existing is removed — you just won't be able to add more until you're back under the limit or resubscribe.
No refunds are provided for partial billing periods.