Cancelling a subscription and losing access are not the same event, and confusing them is the most common billing complaint in this category.
On Google Play and the App Store, cancelling a subscription stops the next charge. It does not refund the period you already paid for, and it does not lock you out immediately — you keep access until the end of the current billing period, then it lapses.
This confuses people in both directions. Some cancel straight after subscribing, assuming they have undone the purchase, and are surprised to find they still have access. Others delay cancelling because they do not want to lose access today, and get charged again. If you know you do not want to renew, cancel immediately: you lose nothing.
If you subscribed inside an Android app, the subscription lives in Google Play, not in the app: Play Store → Subscriptions → the app → Cancel. Uninstalling does not cancel anything, and a subscription can happily keep charging on a phone with no app installed. For Evia, subscriptions bought through the Android app are managed in Google Play the same way.
If you subscribed on a website with a card, cancellation happens on that site or through the billing provider’s portal, not through any store. Check which of the two applies before you go hunting in the wrong place.
Some apps offer a free trial that requires a card up front and converts to a paid subscription automatically unless you cancel first. Kindroid documents exactly this: a three-day premium trial that requires a payment method on file and auto-converts unless cancelled. That is a legitimate and common arrangement, but it means the trial is only free if you act.
If you start one, set a reminder for the day before it converts. This is the single most common source of a charge people describe as unexpected.
What the billing period actually is — weekly plans are common in this category and a weekly price looks much smaller than the monthly equivalent it works out to. Whether the plan you are buying includes the specific feature you want, since photo or video generation is often metered separately by credits or tokens even on a paid tier. And how to cancel, which you should know before you need it.
If a price is not visible before signup, that is worth pausing over; several apps in this category publish nothing until you have an account.