via PayPal

1. Log in at www.paypal.com.
2. Click the Settings icon next to "Log out."
3. Select Preapproved Payments under "Payment settings."
4. Select iGenApps Inc
5. Click Cancel Subscription button.

via Stripe (Card provider)

Contact us.

via Apple

In Settings.

1. Tap iTunes & App Store.
2. Tap your Apple ID along the top.
3. Tap View Apple ID and login.
4. Under Subscriptions, tap Manage.
5. Tap on Apper / iGenApps.
6. Turn off Automatic Renewal.
7. Tap Done.

via Google

1. Open the Play Store app
2. Find Apper
3. Cancel Subscription