Can I open-source Proton Unlimited?
KINDA · partial or early alternativesKinda. Vaultwarden and Passbolt cover the core of Proton Unlimited, but they're early or partial — expect gaps like calendar-provider edge cases and timezone correctness and audited cryptography and incident response.
Proton Unlimited: Security subscriptions buy professional operations, audits, response capacity, redundancy, and accountability when something goes wrong.
xcalendar-provider edge cases and timezone correctness
xaudited cryptography and incident response
xglobal network or redundant storage infrastructure
xidentity, credit, or broker-removal operations
xrecovery guarantees and regulated trust
These projects already replace it, free.
VVaultwardenLightweight Bitwarden-compatible password server — the official apps work with your own backend.open source↗KKeycloakBattle-tested identity and access management server with SSO, OIDC/SAML, federation, and admin consoleopen source↗PPassboltTeam password manager built for collaboration with granular sharing and audit logs.open source↗What each one is, in full: Vaultwarden · Keycloak · Passbolt
no votes, no pay-to-list · just what's real
Proton Unlimited pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| proton free | $0/user | $0/user | 1 user; 1 email address; 1 GB storage initially, expandable to 5 GB by completing account actions; limited VPN and Pass |
| proton unlimited | $12.99/user | $9.99/user | 1 user; 500 GB storage; 15 email addresses; 3 custom domains; 10 VPN connections; up to 50 password vaults |
free tier1 user; 1 email address; 1 GB initial storage (up to 5 GB after account actions); limited VPN and password-manager access
billingmonthly + annual; annual Unlimited is $9.99/month equivalent
hidden costsTaxes can be added; storage, addresses and users above the included personal limits require a different Proton plan, and discounted acquisition offers can renew at the then-current standard rate
price historyProton Unlimited monthly plan: $11.99 → $12.99 (2023-07)
verified 2026-08-14 · source ↗
Can I open-source Proton Unlimited?
Kinda. Vaultwarden covers the core of Proton Unlimited, but there are real gaps: calendar-provider edge cases and timezone correctness, audited cryptography and incident response. Read the honest list above before committing.
How much does Proton Unlimited cost?
Proton Unlimited costs about $12.99/month (Unlimited, checked 2026-07-31), which is $155.88 per year.
What do I lose by replacing Proton Unlimited?
Honestly: calendar-provider edge cases and timezone correctness; audited cryptography and incident response; global network or redundant storage infrastructure; identity, credit, or broker-removal operations; recovery guarantees and regulated trust. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Proton Unlimited?
Yes: Vaultwarden (Lightweight Bitwarden-compatible password server — the official apps work with your own backend.) Keycloak (Battle-tested identity and access management server with SSO, OIDC/SAML, federation, and admin console) Passbolt (Team password manager built for collaboration with granular sharing and audit logs.)