Open Source Kotlin Password Managers

Lightweight vault and password manager for Android, KeePassDX allows editing encrypted data in a single file in KeePass format and filling in the forms in a secure way. Keep your password safe in a secure place, KeePassDX stores your database in a single encrypted file and can be copied and moved wherever you want. KeePassDX is compatible with other KeePass products, the format is standardized and allows for increased interoperability. KeePassDX is created by the community and the code is completely open, it allows better security and better management of your needs.

PassVault is a secure, offline password manager for Android built with Kotlin and modern security practices. It's a lightweight password manager that allows users to securely store and view credentials on their device. All data is stored locally and sensitive information is encrypted using the Android Keystore system. The application does not require internet permissions, ensuring user data never leaves the device.

2FAS Pass Android is the open-source Android implementation of the 2FAS password-protected authenticator and secure vault project, which blends two-factor authentication (2FA) token generation with a secure vault for managing verification codes and potentially other sensitive credentials. While specific repo details vary by the community project, in the broader 2FAS ecosystem the Android clients are designed to generate TOTP (time-based one-time passwords) and HOTP codes for users’ accounts, helping them meet modern multi-factor authentication needs through a simple, private user interface that works offline and without needing an account. The app supports scanning QR codes to add new authentication tokens, allows local encrypted storage of secrets, and can restore tokens from backups or synced devices. 2FAS focuses on privacy and simplicity—tokens aren’t sent to third parties, metadata isn’t stored externally, and users can secure the app with biometrics or passcodes.

Proton Pass for Android is the official Android client for Proton’s secure password manager and digital credentials vault, designed to help users safely store, autofill, and organize passwords, secure notes, payment details, and other sensitive information directly on their Android devices. Built as a fully native Android application, it provides a polished user experience with Material Design patterns and makes encryption and decryption seamless by handling all sensitive data locally on the device, ensuring that plain text never leaves user control. The app integrates with Android’s autofill system so users can quickly fill login forms across apps and browsers with a tap while maintaining strong password hygiene and avoiding reused or weak passwords. It also supports biometric unlock (fingerprint or face) for convenience and strong session security, along with multi-device sync when users log into their Proton account, keeping vault data consistent across platforms.