Proton Mail costs $25/mo.
These cost $0.
2 free alternatives to Proton Mail, checked for license, recent activity and real adoption. Each one tells you the catch, so you can switch with your eyes open.
The top-rated free, open-source replacement for Proton Mail is Tuta (Open Source Open Source). Switching a 5-person team saves up to $1,500/year compared to Proton Mail's $25/mo subscription.
The catch: Community-driven open source project without dedicated enterprise SLAs.
Proton Mail vs Free Alternatives
Quick side-by-side comparison · $0/mo vs $25/mo
| Alternative | Type | License | Where It Runs | Stars | Head-to-Head |
|---|---|---|---|---|---|
| Tuta | open source | Open Source | Local | ★ 8.1k | Proton Mail vs Tuta → |
| Twake Mail | open source | Open Source | Local | ★ 666 | Proton Mail vs Twake Mail → |
The picks
2 open source · ranked by fit
- 01
Tuta
open sourceOpen SourceLocal8.1knov 2026Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking.
The catch vs Proton MailCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/tutao/tutanota or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
- 02
Twake Mail
open sourceOpen SourceLocal666nov 2026Open source professional email solution with PGP encryption, JMAP protocol, AI-powered responses, and advanced antispam protection. Control your data privately.
The catch vs Proton MailCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/linagora/tmail-flutter or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
Proton Mail Head-to-Head Comparisons (2027)
Side-by-side trade-off breakdowns · 2 free alternatives
Frequently Asked Questions
Direct answers · Proton Mail open-source replacements
What is the best free alternative to Proton Mail?+
The top free alternative to Proton Mail is Tuta (open source, Open Source). Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking. Other popular Proton Mail replacements include Twake Mail.
How much does switching from Proton Mail to a free alternative save?+
Proton Mail starts at $25/month per seat ($300/year). Switching a 5-person team to a free alternative like Tuta saves $1,500 per year in software subscription fees.
Should I vibe-code or build my own Proton Mail clone from scratch?+
Our build verdict for Proton Mail is NO (use a free alternative, save the tokens). Instead of paying recurring SaaS fees for Proton Mail or rebuilding it from scratch, deploy one of the 2 battle-tested open-source alternatives like Tuta.
What is the catch when switching from Proton Mail to Tuta?+
Community-driven open source project without dedicated enterprise SLAs.
