PIN Keeper (com.PinKeeper) on Google Play
PIN Keeper - store your PIN numbers anywhere in secure.Key features:► 4x4 pattern key► strong encryption using AES (Advanced Encryption Standard)► secure memory protection at runtime► open source code► partial data storage► up to 5 slots free storage► no ads and usage limitationsPremium features:► crossplatform device synchronization► up to 31 slots storage► changing pattern key► safe deleting dataWarning! Please enable application data sync for your Google account.