Tuta (Tutanota) vs Mailbox.org
Both are alternatives to Gmail. Here's how they stack up — verified facts, no spin.
Also searched as Mailbox.org vs Tuta (Tutanota) — same comparison, one verdict.
Tuta (Tutanota) is open source (GPL-3.0) and Mailbox.org is not (Proprietary) — so the real question is whether you want to own the email & secure mail stack or rent it.
Tuta (Tutanota)
The cheapest end-to-end encrypted mail — quantum-safe by default.
Tuta (formerly Tutanota) is an open-source, end-to-end encrypted email provider based in Germany under GDPR. It's the budget privacy pick: a free tier with full E2E encryption, and it uniquely encrypts the subject line too. In 2026 it became the first major provider to ship quantum-safe encryption (TutaCrypt, Kyber-1024) to all users by default. The trade-off versus Proton is that it doesn't support OpenPGP, so encrypted mail to outside contacts uses password-protected messages instead.
Mailbox.org
German privacy-focused mail with a full office suite — standards-based.
Mailbox.org is a German, privacy-respecting email host for people who want a professional, standards-based inbox (IMAP/SMTP, custom domains) with an integrated office suite and calendar, powered by 100% renewable energy. It offers PGP encryption and an encrypted-mailbox option, but it's a commercial, closed service rather than open-source — the honest “privacy-friendly and full-featured, without encryption-first constraints” pick.
Side by side
6 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Tuta (Tutanota) | Mailbox.org | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 80 | 50 |
| Open source | Yes | No |
| Self-hostable | No | No |
| Local-first data | No | No |
| License | GPL-3.0 | Proprietary |
| Pricing | Free (1GB, E2E encrypted); Revolutionary ~€3/mo; Legend ~€8/mo | From about €1/month (Light) up to office and business tiers; custom domains supported |
Tuta (Tutanota) edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Gmail? Is Gmail free? What it actually costs →
Tuta (Tutanota)
Strengths
- +Open-source, E2E encrypted — including subject lines
- +Quantum-safe encryption for all users by default
- +Cheapest encrypted-mail paid tiers; German/EU privacy law
- +Free tier includes an encrypted calendar
Trade-offs
- −No OpenPGP or IMAP (uses its own encrypted protocol)
- −Fewer ecosystem extras than Proton
- −Search is client-side by design — an encryption trade-off
Mailbox.org
Strengths
- +Cheap, standards-based (IMAP/SMTP), custom domains
- +German/EU privacy law; PGP support and an encrypted-mailbox option
- +Integrated calendar, contacts, and office suite
Trade-offs
- −Closed-source, commercial service
- −Not end-to-end by default (PGP is opt-in)
- −Interface is more utilitarian than polished
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Tuta (Tutanota)
if you want the source and the option to fork it, and open-source, E2E encrypted — including subject lines.
Choose Mailbox.org
if cheap, standards-based (IMAP/SMTP), custom domains.
Neither, yet
if both carry a real cost you should weigh first — no OpenPGP or IMAP (uses its own encrypted protocol), and closed-source, commercial service. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
Tuta (Tutanota) vs Mailbox.org — common questions
Is Tuta (Tutanota) a better fit than Mailbox.org for email & secure mail?
It depends on what you are optimising for, and the honest split is this: Tuta (Tutanota) scores 80 to Mailbox.org's 50 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Mailbox.org earns its place on a different axis — cheap, standards-based (IMAP/SMTP), custom domains. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Neither of these is local-first by default, so plan the exit at the point you adopt rather than later. Export what matters on a schedule instead of trusting you can retrieve it on demand — that is the most common way a email & secure mail migration turns into a project instead of an afternoon.
Is Tuta (Tutanota) free?
Tuta (Tutanota): Free (1GB, E2E encrypted); Revolutionary ~€3/mo; Legend ~€8/mo. The other side of this comparison, Mailbox.org, is priced as From about €1/month (Light) up to office and business tiers; custom domains supported. "Free" here means no licence fee — if you self-host it you still pay for the server, and the running cost row above is our honest estimate of that.
Are Tuta (Tutanota) and Mailbox.org both alternatives to Gmail?
Yes — both appear in our Gmail comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Gmail and now choosing between the two replacements, which is a narrower and much easier question.
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Facts verified 2026-07-14. Licenses and pricing change — spotted something out of date? That's a correction we want.