Free Proton Mail Alternatives With Real Free Tiers

Proton Mail's free plan is deliberately narrow. One address, roughly 1 GB of storage, a low daily send cap, no custom domain, and no IMAP or SMTP without paying for Proton Bridge. That is not a mistake — it is the shape of a free plan designed to sell the paid one. The question is which alternatives leave you with a wider free tier without giving up the privacy posture that made you look at Proton in the first place.

This page compares eight options on the dimensions that actually bite when you try to live inside a free plan: storage, aliases, custom-domain support and whether you can use a normal desktop or mobile client instead of only the vendor's webmail.

We build AI Emaily. It appears once on this page, in its honest position — a paid client that runs on top of Gmail, Outlook or IMAP with a 7-day trial rather than a free tier. If your requirement is genuinely $0, skip that section; the free options come first and get the space.

Which free Proton Mail alternatives are worth using?#

Short version, before the detail. Match the option to the axis Proton's free tier squeezes you on hardest, then read that section.

• Closest structural swap: Tuta Mail's free tier — end-to-end encrypted mailbox, 1 GB, webmail plus native apps, no custom domain at $0.
• Free with OpenPGP and slightly more room: Mailfence — Belgium-hosted, 500 MB inbox plus 500 MB documents, three aliases, no custom domain at $0.
• Most storage and a custom domain: Zoho Mail's Free Forever plan — 5 GB per user, custom domain over webmail only, no IMAP or POP at $0.
• Free with your hardware: iCloud Mail — 5 GB shared with the rest of iCloud, standard IMAP access, custom domain requires paid iCloud+.
• Free and community operated: Disroot — donation-funded, roughly 1 GB, Rainloop-style webmail, custom domain paid.
• Free aliases in front of any inbox: SimpleLogin's free tier — ten aliases, one destination mailbox, unlimited forwarding bandwidth.
• Free as part of a browser account: Vivaldi Mail — bundled with a Vivaldi account, storage capped at the account tier.
• Free but gated by application: Riseup — activist-focused, invitation and endorsement required, donation-funded.

How Proton's free plan boxes you in#

Before comparing alternatives, name the specific limits that make people look elsewhere. Proton has expanded free storage over time, but the shape is unchanged: one address, low daily sends, no custom domain, three folders, three labels, and no protocol access outside Proton's own clients unless you pay for Bridge. Check the current numbers on Proton's own page — they move — but the shape is what forces the upgrade.

That shape matters because most alternatives are stronger on some of those dimensions and weaker on others. Nothing on this list beats Proton on every axis. What some of them do is give you the axis you were losing on.

How we compared, and what we did not do#

The criteria are the four axes Proton's free plan is narrowest on, plus one that matters more than it looks: whether the vendor publishes a coherent way of paying for the service, because a free tier funded by a business model you cannot identify is a different kind of risk from one funded by paying customers.

This is a read of vendor documentation and live pricing pages in August 2026, not a lab benchmark. We did not run all eight tools in parallel for a month, so nothing is presented as a hands-on performance test. Where a claim depends on a specific storage number or feature toggle, the vendor's own page is the source of truth.

• Storage at $0 — the number that decides how long the free tier lasts before archive management becomes a chore.
• Aliases at $0 — how many separate sending addresses the free tier permits, and whether they need a custom domain.
• Custom domain at $0 — the sharpest paywall in private email; most free tiers do not include it.
• Client access — whether the free tier speaks IMAP, POP and SMTP to normal desktop and mobile clients, or restricts you to the vendor's webmail.
• Funding model — donations, paid tiers, browser account, hardware bundle. This predicts which limit moves and when.

Free Proton Mail alternatives at a glance#

Use this to shortlist two options, not to pick a winner. Rows are grouped by the dimension each one wins on rather than by rank.

1. Tuta Mail — the closest structural swap for Proton free#

Tuta is the option most people mean when they ask which free encrypted email provider is closest to Proton. It is a purpose-built end-to-end encrypted mailbox operated from Germany, with its own webmail and native apps on iOS, Android, macOS, Windows and Linux. Subject lines and metadata are encrypted, not only bodies — a defensible technical claim that Proton does not fully match.

The free tier gives you 1 GB of storage, one email address on a Tuta domain, one calendar and search that is client-side because the server cannot read the mail. It is honest about the trade: no IMAP, no POP and no SMTP even on paid tiers, because standard protocols would break the encryption model. If you want a normal client to speak to the mailbox, Tuta is not it, and it does not pretend otherwise.

Custom domain is paid. Aliases are paid. Support for multiple calendars is paid. What you keep at $0 is a genuinely private mailbox, indistinguishable from Proton free on the encryption axis, sometimes narrower on storage than a promotional Proton tier and sometimes wider — check the current numbers on Tuta's own page before assuming.

The honest concession: if your workflow depends on a normal desktop mail client — Thunderbird, Apple Mail, Outlook — Tuta will not fit and Proton with Bridge (paid) will. On every other axis this is the closest one-to-one swap.

2. Mailfence — Belgium-hosted, OpenPGP-native#

Mailfence is operated by a small Belgian company that has been running the service since 2013. It uses OpenPGP for end-to-end encryption rather than a proprietary scheme, so keys are interoperable with any other PGP user — a real advantage if you already exchange encrypted mail with people who are not on Mailfence.

The free tier gives 500 MB of mailbox storage and 500 MB of document storage, up to three aliases on a Mailfence domain, and the standard suite of contacts, calendar and documents. Custom domain is paid. IMAP, POP and SMTP are on paid tiers only, so a free Mailfence account is a webmail-plus-mobile-app experience.

Where Mailfence beats a lot of the field is jurisdiction and OpenPGP interoperability. Belgian data-protection law is strict, and PGP keys you generate here work anywhere else PGP does. Where it loses is storage — 500 MB is tighter than most alternatives on this list, and it fills faster than you expect once you start attaching things.

3. Zoho Mail Free Forever — 5 GB per user, custom domain over webmail#

Zoho is the outlier on this list. It is not a privacy-marketed email provider; it is a business mail suite whose free tier happens to be more generous on storage and custom-domain support than every private-mail alternative here. If your requirement is a free plan you can host your own domain on, Zoho is often the only realistic answer.

Free Forever gives 5 GB per user, up to five users on a single custom domain, plus webmail, calendar and a mobile app. The catch that people miss is protocol access: the free tier is webmail and mobile-app only, so IMAP, POP and SMTP require a paid plan. That means you cannot use Thunderbird, Apple Mail or Outlook against a free Zoho mailbox — a real limit for anyone whose muscle memory lives in a desktop client.

Encryption is at-rest and in-transit, not end-to-end. Zoho is a hosted business inbox with disclosed key management; if end-to-end is a hard requirement, Tuta or Mailfence remains the better fit. If a custom domain is the hard requirement and encryption posture is a soft one, Zoho wins the free tier outright.

4. iCloud Mail — 5 GB shared with the rest of your Apple storage#

If you already own an Apple ID, you already have iCloud Mail. It gets 5 GB of storage, but that pool is shared with photos, backups and iCloud Drive — most people already use most of it before they think about mail. Three @icloud.com aliases are included, so you can compartmentalise sign-ups without a paid tier.

The reason iCloud belongs on a free private-email roundup is protocol support. Unlike Tuta and free Zoho, iCloud Mail speaks full IMAP and SMTP to any standard client with an app-specific password — Thunderbird, Apple Mail, Outlook, Mimestream, or any AI-native client that supports IMAP. That is the single feature that makes it more flexible than most encrypted alternatives at $0.

The honest limits. It is not end-to-end encrypted by default; Advanced Data Protection is opt-in and does not cover mail in the same way it covers other iCloud data. Custom domain requires iCloud+, which is paid. And Apple's incentive structure is to sell you more iCloud storage rather than a mail-specific tier, so this is only ever a free option for as long as your total iCloud footprint fits inside 5 GB.

5. Disroot — donation-funded, community operated#

Disroot is a Netherlands-based collective running a stack of libre services — mail, XMPP chat, Nextcloud file storage, forge, pads — funded entirely by donations. A free Disroot account gets you roughly 1 GB of mailbox storage, standard IMAP, POP and SMTP, and a webmail interface built on Rainloop.

The trade is one of funding model rather than features. Disroot is not selling you a free tier to convert you to a paid one; it is asking you to donate if you can afford to. Storage grows on request for donating users, and custom-domain hosting is a paid add-on rather than a plan upgrade. The privacy posture is transparent, the code is open source where it can be, and the whole operation is documented.

The risk is proportional to the model. A donation-funded service is only as durable as its donors, and small operators do occasionally close. Keep a local export of anything you cannot afford to lose — good advice on any mail service, doubly good here.

6. SimpleLogin — free aliases in front of any inbox#

SimpleLogin is not a mailbox; it is an alias layer that sits in front of one. Its free tier gives you ten aliases forwarding to one destination inbox, with unlimited forwarding bandwidth. Every sign-up gets a unique address, so a leak from one service only exposes that one address, and you can disable it without touching anything else.

It belongs on a Proton alternatives page for a specific reason. SimpleLogin was acquired by Proton in 2022 and is now part of the Proton group, but its free tier continues to be operated as a standalone service and works in front of any mailbox — Gmail, Outlook, iCloud, Tuta, Mailfence, whatever you already use.

The honest scope: SimpleLogin does not replace a mailbox. If Proton free is failing you because of the storage cap or the send limit, SimpleLogin will not help — you still need the mailbox those aliases forward to. If it is failing you because you want alias hygiene without paying for it, this is the cleanest free tier available.

7. Vivaldi Mail — a client bundled with a browser account#

Vivaldi is the Norwegian browser company, and Vivaldi Mail is a full IMAP mail client bundled with a free Vivaldi account. It is not a hosted mailbox — it sits on top of accounts you already have at Gmail, Outlook, Fastmail, iCloud or any IMAP provider — but the client itself is a serious desktop mail application with feeds and calendar integrated.

This belongs on the list because a lot of people who ask about free Proton alternatives actually want a free mail client, not a free mail provider. Vivaldi Mail is a well-supported one, funded by the browser's search and partnership revenue rather than by a mail subscription, with no user tracking as company policy.

It is not encrypted mail at $0 in the Proton sense — the encryption is only as strong as the underlying provider. What it gives you is a private-by-policy client to connect several free mailboxes into one window without paying anyone.

8. Riseup — free, invitation-based, activist-focused#

Riseup has run donation-funded email since 1999 for people working on liberatory social change. Accounts get roughly 1 GB of storage with standard IMAP, POP and SMTP access, and the service has one of the longest continuous operational records of any free private mail provider.

Two catches shape whether it fits you. Registration requires either an invite code from an existing user or an application explaining what you plan to use the account for — Riseup is not a general-purpose signup. And the political framing is explicit; the terms of service ask you to act in the spirit of the mission.

If you fit the audience it is written for, Riseup is one of the most durable free private mailboxes available. If you do not, use one of the other seven options; the invite process is not a gate you should attempt to bluff.

Where AI Emaily fits — and where it does not#

This is the honest paid-alternative section, so read it with that in mind. We build AI Emaily, and it is not a free Proton Mail alternative — there is no permanent free tier, only a 7-day free trial on the Pro plan (card required, $0 if you cancel before day seven). If your requirement is genuinely $0 forever, one of the eight options above is the answer, not this one.

AI Emaily is a client that runs on top of Gmail, Microsoft 365 and Outlook, or any standard IMAP mailbox — including the free Zoho, iCloud and Mailfence tiers above, once they are on a paid tier that exposes IMAP. It does not replace your provider. It reads the mailbox you already have and adds an agent that triages, drafts and closes loops with approval before send, an undo window on every action, and an audit trail of what the agent did.

Where we lose against the free list, plainly. You cannot use AI Emaily with a Tuta or free Zoho mailbox, because neither exposes standard IMAP. You cannot use it at $0 permanently; the trial ends and the plan bills. And we do not encrypt the mailbox itself — we run on top of yours, so your provider's encryption model is your encryption model.

Where the model is different, and why it may still matter. We do not train on your mail. OAuth tokens and any bring-your-own model keys are envelope-encrypted. The AI actions the agent takes are gated by an approval step in Copilot mode. If you outgrow one of the free tiers above and want an agent layer rather than another mailbox, the trial and pricing are on our pricing page and the comparison against Proton lives at the linked compare page.

How to choose for your situation#

Match your row and start with one option. Trying six free private mailboxes at once is how people end up back on Gmail two weeks later because none of the migrations finished.

The verdict#

Tuta Mail is the closest structural swap for Proton free — same encryption posture, similar storage, honest limits on protocol access. Mailfence is the better fit if you need OpenPGP interoperability with people already on PGP, at the cost of tighter storage. Zoho Mail Free Forever is the only realistic free tier if a custom domain is non-negotiable, at the cost of no IMAP.

iCloud Mail is the underrated pick for anyone who already owns an Apple ID and can live inside a shared 5 GB — it is the one free tier here with full IMAP and SMTP. Disroot and Riseup are the community-run choices if the funding model matters to you. SimpleLogin belongs on the list because it solves the specific problem of aliases without touching the mailbox.

We build AI Emaily and it is not on the free list because it does not offer a permanent free tier. If your requirement is $0 forever, pick one of the eight options above. If you are on a paid mailbox and want an agent layer that respects approval before send, the 7-day trial is on the pricing page.