Proton Mail vs Tuta vs StartMail (2026): Which Encrypted Email Service Wins?

Affiliate disclosure: Some of the links below are affiliate links. We earn a commission when you sign up through them. This doesn't change your price and doesn't affect our rankings — see our full disclaimer for how we handle vendor relationships.

Three different services, three different priorities. Proton Mail is the polished all-rounder with a real ecosystem behind it. Tuta is the no-compromises encryption purist. StartMail is the IMAP-first power-user pick. We set up an account on each, ran two weeks of real correspondence through them, migrated a Gmail archive into each, and pulled the gloves off. Here's the honest breakdown — and how to pick the one that's actually right for you.

How we tested

We signed up for the paid mid-tier plan on each service (Proton Mail Plus, Tuta Revolutionary, StartMail Personal), connected a custom domain to each, ran two weeks of two-way correspondence through them with both other-Proton and outside (Gmail, Outlook, Fastmail) recipients, and ran each service's official Gmail import tool against the same 4,200-message Gmail mailbox to time the migration and inspect what came across cleanly.

We don't take placement fees and we don't accept "review accounts" with strings attached. The Proton Mail link above and below this article is an affiliate link via Commission Junction; the Tuta and StartMail links are non-affiliate. The ranking would be the same either way — we wrote the verdict before checking the commission rates.

Pricing & plans (2026)

All three providers price in tiers that scale with storage, custom domains, and aliases. The headline rates below are the cheapest legitimate per-month price for each plan length, in USD where the provider quotes USD or USD-equivalent of EUR rates as of May 2026.

Two things worth flagging on price. First, Tuta is meaningfully cheaper than the other two on the headline rate and ships more storage at that price — the catch is the lack of native IMAP. If you live in a desktop email client (Apple Mail, Thunderbird, Outlook), that's a hard limitation. Second, Proton Mail's 1 GB free tier is enough for a real personal account if you treat it as a "where I sign up for things" address, and converts smoothly to Plus when you outgrow it.

Best value right now: if you want the broadest ecosystem and the smoothest upgrade path, Proton Mail Plus at $4.99/mo wins. If you want pure encryption at the lowest price, Tuta Revolutionary is the cheaper pick. If you need IMAP and unlimited domains, StartMail is the only one that ships both.

Encryption model & what's actually private

All three services advertise "encrypted email," but the technical model is meaningfully different across them, and the differences matter for the threat models people actually have.

Proton Mail uses OpenPGP. When you send mail to another Proton Mail user, the message body and attachments are end-to-end encrypted with the recipient's public key — Proton's servers cannot read it. When you send mail to a non-Proton recipient, you have two options: standard SMTP delivery (TLS in transit, not end-to-end), or "Send to outside" which wraps the message in a Proton-hosted page that the recipient unlocks with a password you share out-of-band. Inbound mail from outside addresses is encrypted at rest after it lands in your inbox, but it arrives in the clear and Proton holds it briefly before encryption. Subject lines are stored in the clear on older accounts; newer accounts encrypt them.

Tuta uses its own AES-128 + RSA-2048 hybrid scheme rather than OpenPGP. The big functional difference: Tuta encrypts subject lines and contact-list metadata as well as message bodies, and does so consistently across all account ages. Mail sent between two Tuta users is fully end-to-end encrypted including subject; mail sent to outside recipients can be sent as encrypted (recipient unlocks with a shared password) or as standard SMTP. Inbound mail from outside addresses gets the same "encrypted at rest after a brief plaintext window" treatment as Proton.

StartMail uses PGP for messages between StartMail users and offers a "send encrypted" option for outbound mail to non-StartMail recipients (recipient unlocks with a shared password, similar to Proton's outside flow). The mailbox itself is encrypted at rest using a key derived from your account password. Subject lines on inbound external mail are stored in the clear. StartMail's encryption story is the most conservative of the three: solid, standards-based, but not differentiated.

What this means in practice: if your threat model is "a server-side breach should reveal as little as possible," Tuta is the most defensible. If your threat model is "I want to interoperate with the existing PGP-using world," Proton Mail wins because OpenPGP is a real interop standard. If your threat model is mainly "I don't want Google or Microsoft scanning my mail for ad targeting," all three solve that problem equivalently and other criteria (domains, IMAP, ecosystem) should drive your pick.

Jurisdiction & legal posture

Where the company is incorporated determines which law-enforcement requests it has to comply with and what data-retention obligations apply.

• Proton Mail — Switzerland. Outside the EU; not a member of 5/9/14 Eyes intelligence-sharing agreements. Swiss law requires a court order from a Swiss judge for any data disclosure, and the law has a "necessary in a democratic society" proportionality test that has historically been a high bar. Proton publishes a transparency report.
• Tuta — Germany. EU member, subject to GDPR (which is a privacy positive) and to German telecommunications law (which has historically included data-retention obligations that have been litigated repeatedly — currently no general data retention applies to email-only providers in Germany as of 2026, but the legal landscape moves). Tuta publishes a transparency report and has fought multiple legal challenges over decryption assistance.
• StartMail — Netherlands. EU member, GDPR. Dutch law is generally privacy-friendly but the Netherlands is a member of 9 Eyes intelligence-sharing.

If jurisdiction is the deciding factor for you, Proton Mail's Swiss base is the strongest of the three. Tuta's German base is fine for most users but more legally turbulent over time. StartMail's Dutch base is the weakest of the three on raw jurisdiction, though still better than US-based mail.

Features: domains, aliases, calendar, storage

The encryption model is necessary but not sufficient — the day-to-day usability of the service is what determines whether you'll actually move to it.

The pattern here is the ecosystem story. Proton has built a privacy suite around the mailbox — mail + calendar + drive + VPN + password manager are all under one Proton Account, and the bundled Proton Pass password manager is now competitive with the dedicated players. Tuta has stayed deliberately focused on mail + calendar. StartMail is mail-only but pays that focus back in IMAP and unlimited domains.

Migrating from Gmail or Outlook

The single biggest barrier to switching email providers is moving years of accumulated mail and contacts. We tested each service's official import path against the same 4,200-message Gmail mailbox.

• Proton Mail's Easy Switch ran end-to-end in 22 minutes. Imported all 4,200 messages with folder structure preserved, brought across the Gmail contact list, and (on Plus and above) pulled in Google Calendar events as well. Easy Switch handles Gmail, Yahoo, Outlook, and IMAP-based providers in a single guided flow.
• Tuta's import required the desktop app and ran for 38 minutes. Folder structure was preserved but contacts had to be exported from Gmail as a CSV and re-imported separately. Calendar import is in beta as of May 2026 and worked but lost some recurring-event metadata.
• StartMail's import uses standard IMAP-to-IMAP transfer through the StartMail web UI. The fastest of the three at 18 minutes for the same mailbox, but you have to enable IMAP in Gmail first and use a Google App Password — a step Proton's Easy Switch handles for you. Contacts and calendar were not imported (StartMail doesn't have a calendar product).

If migration friction is what's been keeping you on Gmail, Proton Mail's Easy Switch is the deciding factor. It's the only one of the three that turns a one-day project into a 20-minute one.

Apps, IMAP & ecosystem

All three have official iOS and Android apps and official desktop apps for macOS, Windows, and Linux. The apps are competent across the board — none of them are best-in-class for desktop email management compared to native clients, but they're all usable as your primary mail interface.

The big ecosystem fork is IMAP. Proton Mail requires a paid plan and the separate Proton Mail Bridge app to use IMAP/SMTP with a desktop client like Apple Mail or Thunderbird. Tuta does not support IMAP at all — you use Tuta only through Tuta's apps. StartMail supports IMAP/SMTP natively on every paid plan with no bridge required. If you live in Apple Mail or Thunderbird, StartMail is the lowest-friction choice; if you're willing to use the Proton apps, Proton's iOS/Android experience is the most polished.

Final verdict by use case

Start with Proton Mail (free or Plus) →

Frequently asked questions

Is Proton Mail really end-to-end encrypted?

Between two Proton Mail users, yes — the message body and attachments are end-to-end encrypted with OpenPGP using the recipient's public key. Mail to non-Proton recipients can be sent as a "Send to outside" encrypted package (recipient unlocks via a browser with a password you share separately) or as standard TLS-in-transit SMTP, which is not end-to-end. This is a limitation of how SMTP works between providers, not specific to Proton.

What's the difference between Proton Mail and Tuta?

Encryption model and ecosystem. Proton uses OpenPGP and bundles a full privacy suite (VPN, Calendar, Drive, Pass) under one account. Tuta uses its own AES-based scheme that encrypts subject lines as well as bodies, runs cheaper, and is deliberately mail-only.

Is StartMail worth the price?

It's the right pick for power users who need IMAP, unlimited custom domains, or unlimited disposable aliases. It's not the value pick — Tuta is cheaper and Proton bundles more — but it's the most flexible for technical users running multiple projects.

Can I keep my Gmail address?

Yes — all three services let you forward your Gmail to your new encrypted address while you transition. Proton Mail's Easy Switch sets up forwarding automatically; Tuta and StartMail require you to set forwarding in Gmail manually.

Do these work with iPhone Mail / Apple Mail?

StartMail works natively via IMAP. Proton Mail works in Apple Mail through the Proton Mail Bridge app on macOS (paid plan required) and through its own iOS app. Tuta works only through its own apps — no Apple Mail integration.

The bottom line

For 80% of people switching away from Gmail, the answer is Proton Mail. The Easy Switch migration tool is the deciding factor — it removes the single biggest reason people stay on Gmail despite knowing they shouldn't. The Proton ecosystem (VPN, Calendar, Drive, Pass) is the second deciding factor. The free plan is enough to test it without committing.

Pick Tuta if you've read this far and you specifically care about encrypted subject lines and minimal server-side metadata — that's a real differentiator and Tuta is the only one of the three that does it consistently. Pick StartMail if you live in Apple Mail or Thunderbird and need native IMAP without a bridge app, or if you run multiple projects on separate custom domains.

Start with Proton Mail Free →