How to restore your purchase

You can restore your previous purchase by following these steps. 

Restore purchase bought with iTunes

1. Make sure you are logged in with the iTunes account you used to buy a tuning package or subscription. Check information from Apple support about signing in with an Apple ID. If you used a different account, you need to re-install GuitarTuna after logging in with the correct iTunes account. 
2. Open GuitarTuna and select the Settings button in the bottom right corner.
3. Scroll down to the Subscription section and tap Restore Purchases button. 

Restore purchase bought with Google Play

1. Make sure you are logged in with the Google Play account you used to buy a tuning package or subscription. Check information from Google Play support on how to use accounts in Google Play store. If you used a different account, you need to re-install GuitarTuna after logging in with the correct Google Play account. 
2. Open GuitarTuna and select the Settings button in the bottom right corner.
3. Scroll down to the Subscription section and tap Restore Purchases button. 

If the restore didn't work, try to clear the app cache and data by doing the following:

1. Open your device's Settings app. 
2. Tap App & Notifications/App management → See all apps/App list.
3. Scroll down and select GuitarTuna from the list.
4. Tap Storage/Storage usage → Clear cache.
5. Next tap Clear data.

Once you clear data and cache, try to restore the purchase again. 

Note: cross-platform transfers (e.g. Android → iOS or iOS → Android) are not possible.