Best Site for Open Source Password Manager
Summary
The best open-source password manager is Bitwarden — fully audited open-source codebase, generous free tier, cross-platform, with optional self-hosting. KeePassXC is the strongest fully-local choice with no cloud at all, useful when sync is not needed or handled manually. Vaultwarden is the community Rust reimplementation of the Bitwarden server, ideal for self-hosting with lower resource use than the official server. Proton Pass is the newest entrant from Proton with an honest open-source posture and integrated email-alias features for users already on Proton. 1Password and LastPass do not qualify here — 1Password is closed source despite a public vault format, and LastPass has both closed source and a major 2022 breach disqualifying it.
Top 5 at a glance
| # | Site | Best for | Price |
|---|---|---|---|
| 1 | Bitwarden | Audited open-source cloud password manager with free tier and self-host option | Free for personal use, Premium ~$10/year, Families ~$40/year |
| 2 | KeePassXC | Fully-local open-source vault with no cloud at all | Free, open source |
| 3 | Vaultwarden | Lightweight self-hosted Bitwarden-compatible server | Free, open source |
| 4 | Proton Pass | Open-source password manager bundled with Proton email and VPN | Free tier, Pass Plus around $4/month, included in Proton Unlimited |
| 5 | Padloc | Smaller open-source alternative with end-to-end encryption and a clean UX | Free tier, paid family plan |
Detailed rankings
Bitwarden
Audited open-source cloud password manager with free tier and self-host option
The default open-source password manager in 2026. Free tier is enough for most users; Premium is worth it to support the project.
Pros
- Open source under GPL/BSL (server) and GPL (clients)
- Independent security audits published periodically
- Cross-platform: Windows, macOS, Linux, iOS, Android, browser extensions
- Self-host option using the official Bitwarden server stack
- Generous free tier including unlimited devices and password sync
- Bitwarden Send for ephemeral secret sharing
Cons
- Some server components moved to Bitwarden License (BSL) — verify if license matters to your use
- Premium needed for TOTP storage and emergency access — debatable feature placement
- Self-hosting the official stack is heavier than Vaultwarden for small setups
- Has had outages — sync interruption locks you out of new passwords briefly
Price: Free for personal use, Premium ~$10/year, Families ~$40/year
Sources: bitwarden.com, github.com
KeePassXC
Fully-local open-source vault with no cloud at all
The right pick when you reject cloud sync entirely. Pair with Syncthing for multi-device sync without any third party.
Pros
- Truly local — vault is a file on your disk, no server involved
- GPL-licensed, audited, mature codebase
- Cross-platform desktop (Windows, macOS, Linux)
- Browser-extension support via keepassxc-browser
- Keyfile + password combination for stronger unlocking
- YubiKey HMAC-SHA1 challenge support
Cons
- No native mobile app — pair with KeePassDX (Android) or Strongbox (iOS) which are separate projects
- Sync is on you — Syncthing, your own WebDAV, or cloud storage
- User must remember to back up the .kdbx file
- Browser-extension setup has more friction than Bitwarden
Price: Free, open source
Sources: keepassxc.org
Vaultwarden
Lightweight self-hosted Bitwarden-compatible server
The right pick when you self-host. Use the official Bitwarden clients and point them to your Vaultwarden instance.
Pros
- Rust reimplementation of the Bitwarden server API — works with all official Bitwarden clients
- Far lower resource footprint than the official server — runs on a $5 VPS
- GPL-3 licensed
- Active maintenance
- Same features available through clients without paying for Bitwarden Premium (TOTP, emergency access, etc.)
Cons
- Not officially endorsed by Bitwarden — community project
- You are responsible for backups, TLS, and updates
- If your server fails, you lose access until restored from backup
- Setup requires comfort with Docker and reverse proxies
Price: Free, open source
Sources: github.com
Proton Pass
Open-source password manager bundled with Proton email and VPN
The right pick when you already pay for Proton and want one provider for mail, VPN, drive, and passwords.
Pros
- Open source on iOS, Android, web, and browser extension
- Built-in email aliases via SimpleLogin (Proton acquired in 2022)
- End-to-end encryption with Proton's established crypto
- Strong cohesion if you already pay for Proton Mail or VPN
- Swiss-jurisdiction operator
Cons
- Newer than Bitwarden — shorter audit history
- Free tier is more limited than Bitwarden Free on item types
- Closer integration with the Proton ecosystem means lock-in pressure
- TOTP storage on free tier limited
Price: Free tier, Pass Plus around $4/month, included in Proton Unlimited
Sources: proton.me
Padloc
Smaller open-source alternative with end-to-end encryption and a clean UX
The right pick when you want a simpler open-source alternative and accept the smaller-project risk. Bitwarden remains a safer default for most users.
Pros
- Open source under AGPL
- Self-host option with Docker
- Clean modern UX
- End-to-end encryption with audited cryptography
Cons
- Much smaller user base than Bitwarden — less network effect
- Browser-extension experience trails Bitwarden
- Mobile app maturity lags behind the bigger players
- Future viability less certain than Bitwarden or KeePassXC
Price: Free tier, paid family plan
Sources: padloc.app
How we chose
- Source openness — code public, license OSI-approved, reproducible build where possible.
- Security audits — third-party audits published.
- Cross-platform reality — desktop, mobile, browser extensions actually working.
- Self-host option for users who do not trust any provider.
- Honesty about closed-source competitors — 1Password and LastPass excluded.
- Master-password threat model — emphasis on memorable + long, not 'use a password manager and reuse passwords'.
Frequently asked questions
Why exclude 1Password?
1Password is closed source. The vault file format is documented and the security architecture is detailed publicly, but the client and server source code are proprietary. That excludes it from an open-source ranking. 1Password is well-respected on the security side; it is just not the right answer to the open-source question.
Why exclude LastPass?
LastPass is closed source and suffered a major breach in 2022 where encrypted vaults and substantial metadata were exfiltrated. Even users with strong master passwords were exposed to offline attacks against the exfiltrated vaults. The combination of closed source and a serious unrecovered breach disqualifies it.
Is Bitwarden still open source under the BSL change?
Bitwarden moved parts of its server code to the Business Source License (BSL) in 2024 for some components — the clients remain GPL. The BSL is source-available rather than strictly open-source under the OSI definition. For typical end users, code is still publicly viewable and modifiable; for commercial competitors offering Bitwarden as a service, the BSL imposes restrictions. Vaultwarden remains fully GPL.
Should I use the password manager's TOTP feature?
It is debated. Convenience side: one app, autofill. Security side: TOTP plus password in the same vault means a compromise of the vault undoes both factors. The more security-conscious choice is a separate TOTP app (Aegis on Android, Raivo or 2FAS on iOS) or a hardware key (YubiKey, SoloKey). For most users the convenience win is fine; for high-value accounts (email, banking, exchange) keep TOTP separate.
What is the realistic master-password strength?
Six random dictionary words from a 7,776-word list (Diceware) gives roughly 77 bits of entropy — enough to resist offline cracking even against a leaked vault. Avoid 'password123' patterns. The master password is the single failure point — make it long, memorable, and unique to the vault.