Settings > iTunes & App Store > Choose your Apple ID > Subscriptions > Plann > Cancel Subscription
To find out more on viewing, changing or cancelling Apple subscriptions, visit the Apple support page.
Google Play Store > Account > My Subscriptions > Plann > Manage > Cancel Subscription
To find out more on viewing, changing or cancelling Google Subscriptions, visit the Google support page.
As an app, Plann is technically a product of each App Store and the app only subscriptions are managed directly through them.
Plann can not cancel your active paid subscription or restore a cancelled subscription that has been purchased through one of the App Stores. Please contact your respective providers or visit their support page above for more help.