Plans bought on the website (1kr.uk) come with a 14-day money-back guarantee. If a plan isn't right for you, ask for a refund within 14 days of buying it and you get your money back in full; no reason needed.
How to ask: write to support@1kr.uk from your account's e-mail address, within 14 days, and say which plan. The refund goes back to the payment method you used, through our reseller; it usually shows within a few working days, depending on your bank. On Billing, the subscription then shows as "refunded" and the app goes back to the free plan (or to Starter shared from your other app).
Bought on iPhone (App Store): Apple handles those payments, so refunds follow Apple's rules. Ask Apple at reportaproblem.apple.com, or in the iPhone's Settings → Apple ID → Purchase History.
Just want to stop paying? Cancelling (see "Managing or cancelling a subscription") stops the next payment; the plan runs until the end of the period you paid for.
Starter on your own AI key is free, so there's nothing to refund; your AI provider bills its own usage.