Highly secure and easy to use OTP client written in C/GTK3 that supports both TOTP and HOTP and has the following features:

• integration with the OS' secret service provider via libsecret
• support both TOTP and HOTP
• support setting custom digits (between 4 and 10 inclusive)
• support setting a custom period (between 10 and 120 seconds inclusive)
• support SHA1, SHA256 and SHA512 algorithms
• support for Steam codes
• import and export encrypted/plain andOTP backup
• import and export encrypted/plain Aegis backup
• import and export plain FreeOTPPlus backup (key URI format only)
• import of Google's migration QR codes
• local database is encrypted using AES256-GCM (PBKDF2 with SHA512 and 100k iterations) and, while decrypted, it's stored in a secure memory area allocated by GCrypt.