Several tips help to develop a GDPR compliant mobile app:
 Be extra cautious while collecting user data
 Ask for permissions and explicit consent
 Mention how you will use the collected user data
 Encrypt data to avoid unauthorized access
 Use two-factor authentication steps
 Inform and educate your users
 Delete any additional information that is not required
 Delete data of users who opt-out
 Review SDKs and third-party services you collaborate with