SecureAuth: Offline 2FA

KingSmile Studios

About this app

SecureAuth is a privacy-first, fully offline two-factor authentication (2FA) app and password vault. No cloud. No accounts. No telemetry. No ads. Every secret stays on your device — the app doesn't even request internet permission.

TWO-FACTOR AUTHENTICATION
• TOTP (RFC 6238), HOTP (RFC 4226) and Steam Guard tokens
• SHA-1 / SHA-256 / SHA-512, 4–8 digits, 15–60s periods
• Add accounts by QR scan, from an image, or manually
• Show any account as a QR code to move it to another device
• Live search, drag-to-reorder, next-code preview

PASSWORD VAULT & AUTOFILL
• Store passwords and passkeys in an encrypted local vault
• System-wide autofill via Android Credential Manager
• Biometric-gated access to your credentials

SERIOUS SECURITY
• Argon2id password hashing (Password Hashing Competition winner)
• AES-256 encrypted local database
• Brute-force protection with exponential-backoff lockout
• Optional data wipe after repeated failed attempts
• Auto-lock on inactivity, clipboard auto-clear
• Screenshot blocking & app-switcher privacy
• Clock-tamper detection and a security audit log

BACKUPS YOU CONTROL
• AES-256-GCM + Argon2id encrypted backup files
• Plain JSON export for interoperability
• Import from encrypted or plain backups — all offline

13 LANGUAGES
English, Türkçe, Deutsch, Español, Français, Português, Русский, العربية, Azərbaycanca, 日本語, 한국어, 中文 and more.

100% open source. Your secrets belong to you — SecureAuth just keeps them safe.