Best Open Source Password Managers

What Makes a Password Manager "Best"

Ranking password managers requires evaluating several dimensions simultaneously. Encryption strength and security architecture form the baseline, since any tool in this category must implement zero-knowledge encryption properly or it is disqualified immediately. Beyond that baseline, the factors that separate good from great are platform coverage, usability, sync reliability, sharing features, extensibility, and the health of the open source community behind the project.

An active open source community matters more than people realize. It means bugs get patched quickly, features keep pace with evolving standards like passkeys and FIDO2, and the project is unlikely to be abandoned. All five managers on this list have active GitHub repositories with regular commits, responsive issue trackers, and established contributor bases.

Bitwarden: Best Overall

Bitwarden occupies the top position because it delivers the broadest feature set with the least friction. It has native apps for Windows, macOS, Linux, iOS, and Android, plus browser extensions for Chrome, Firefox, Safari, Edge, and Brave. The web vault provides access from any browser without installing anything. Every one of these clients is open source and published on GitHub.

The free tier is genuinely comprehensive. It includes unlimited passwords on unlimited devices, a password generator, secure notes, credit card and identity storage, and basic two-factor authentication via authenticator apps. Most individual users will never need to upgrade. The premium tier at roughly ten dollars per year adds advanced 2FA with YubiKey and FIDO2, 1 GB of encrypted file attachments, vault health reports that flag weak and reused passwords, emergency access that lets a trusted contact request vault access after a waiting period, and a built-in TOTP authenticator.

Bitwarden's server code is also open source under the AGPL license, which means organizations can self-host using Docker. The official self-hosted deployment requires more resources than Vaultwarden but includes full feature parity with the cloud service, including SSO, SCIM provisioning, and enterprise policies. Bitwarden commissions annual third-party security audits from firms like Cure53 and publishes the full reports, giving users concrete evidence of its security posture rather than just promises.

The passkey support introduced in recent versions allows Bitwarden to act as a FIDO2 authenticator, storing and autofilling passkeys for websites that support them. This positions Bitwarden for the ongoing transition away from traditional passwords.

KeePassXC: Best for Offline Control

KeePassXC is the choice for users who want zero cloud dependency and total control over their vault file. It stores everything in a single KDBX-format encrypted file on your local filesystem. There is no account to create, no server to trust, and no subscription to pay. The software is completely free and always will be.

The encryption is robust. KeePassXC supports AES-256 and ChaCha20 for vault encryption, with Argon2d or Argon2id for key derivation. Users can configure the memory cost, parallelism, and iteration count for Argon2 to match their hardware, making brute-force attacks on the vault file extraordinarily expensive. An independent security audit in 2023 by researcher Zaur Molotnikov confirmed the soundness of KeePassXC's cryptographic implementation.

For developers, KeePassXC includes SSH agent integration that serves SSH keys directly from the vault. You unlock your KeePassXC database, and your SSH keys become available to your terminal session without ever being stored as files on disk. The browser integration works through a companion extension for Chrome and Firefox, communicating with the desktop app over a local socket to fill login forms.

The trade-off is that sync is your responsibility. Many KeePassXC users sync their vault file across devices using Syncthing, Nextcloud, Dropbox, or Google Drive. Because the file is encrypted before it reaches any cloud service, the sync provider never sees your passwords. On mobile, you need a separate KeePass-compatible app since KeePassXC itself is desktop-only. Strongbox on iOS and KeePassDX on Android are the strongest options, both supporting the KDBX 4 format with Argon2 key derivation.

Vaultwarden: Best for Self-Hosting

Vaultwarden is an unofficial, community-developed reimplementation of the Bitwarden server API, written in Rust. It is designed to be lightweight enough to run on hardware that would struggle with the official Bitwarden server. At idle, Vaultwarden consumes under 50 MB of RAM and minimal CPU. It runs comfortably on a Raspberry Pi, a cheap VPS with 512 MB of RAM, or alongside other services on a home server without competing for resources.

Despite its small footprint, Vaultwarden provides near-complete compatibility with the Bitwarden ecosystem. All official Bitwarden client apps, browser extensions, and the web vault work with Vaultwarden out of the box. Users get access to features that Bitwarden reserves for its premium tier, including file attachments, emergency access, and organization support, all at no cost. The admin panel provides a web interface for server management, user administration, and configuration without touching config files.

Vaultwarden uses SQLite by default, so the entire database lives in a single file. No separate database server is required. Backups are as simple as copying the data directory. For users who need something more robust, PostgreSQL and MySQL are also supported. The deployment process is streamlined around Docker: pull the image, set a few environment variables, configure a reverse proxy for HTTPS, and the server is ready.

The project is actively maintained with regular releases that track Bitwarden's API changes. The GitHub repository has a large, engaged community that reports bugs, contributes fixes, and helps new users with deployment questions. While Vaultwarden is not officially affiliated with Bitwarden, the two projects coexist without conflict, and many users start with Vaultwarden before eventually migrating to the official server if they need enterprise features like SSO.

Passbolt: Best for Teams

Passbolt approaches password management from a team-first perspective. Instead of the individual vault model used by most managers, Passbolt is built around sharing credentials with fine-grained access controls. Each secret can be shared with specific users or groups at one of three permission levels: view-only, can update, or full control with reshare rights. This prevents the common problem of shared vaults where everyone can see everything.

The encryption model uses OpenPGP, providing end-to-end encryption where the server never sees plaintext secrets. Each user has their own GPG key pair, and shared secrets are encrypted individually for each recipient. This means compromising the server yields only encrypted data, and revoking a user's access is cryptographically enforced rather than relying on access control lists alone.

The community edition is free and self-hostable, covering core credential sharing, browser extensions for Chrome and Firefox, user management, and activity logs. The Pro edition adds SSO with Microsoft Entra ID, Google Workspace, and OpenID Connect, along with LDAP directory sync, MFA enforcement policies, and mobile apps. Passbolt has been audited by Cure53 multiple times, with reports published publicly, and the 2026 audit covered both the API and the browser extension.

For teams that need compliance documentation, Passbolt's audit log tracks every access, share, update, and deletion with timestamps and user identification. These logs can be exported to external monitoring systems for integration with your existing security information and event management (SIEM) infrastructure.

Proton Pass: Best for Privacy-Focused Users

Proton Pass comes from the same team behind ProtonMail, ProtonVPN, and Proton Drive. It is open source, end-to-end encrypted, and designed to integrate with the broader Proton privacy ecosystem. The standout feature is the built-in email alias generator, which creates unique forwarding addresses for each account you create. If a service gets breached or starts sending spam, you disable that specific alias without affecting your real email address.

The free tier includes unlimited passwords, unlimited aliases, and apps for iOS, Android, and browser extensions. The Plus plan adds integrated 2FA, secure sharing, multiple vaults, and dark web monitoring. Proton Pass uses a custom encryption protocol based on the Signal protocol, with all cryptographic operations happening on your device before any data reaches Proton's servers.

Proton Pass is newer than the other options on this list, having launched in 2023, so its feature set is still maturing. It does not yet offer a desktop app or self-hosting option. However, for users already paying for Proton Unlimited, the password manager is included at no additional cost, making it a natural choice for anyone committed to the Proton ecosystem.

Quick Comparison