Manage your subscription where you bought it.
Bought on the web
Settings > Subscription > Manage subscription opens a secure Stripe page where you can update your card, see invoices, or cancel.
Bought on iPhone
Go to your Apple subscriptions (or Settings > your name > Subscriptions on your iPhone) and choose KeepSaiQ.
Bought on Android
Open the app and choose More > Plan & billing > Manage in Google Play, or go to Google Play > Payments & subscriptions > Subscriptions.
When does it end?
Cancel any time. You keep your plan until the end of the period you've paid for. Your family's memories are never deleted because a subscription ends.