5 Best Alternatives to Proton Mail for iOS in 2026
By Noahlast updated
All 5 Proton Mail alternatives
Compared: Proton Mail alternatives that run on iOS
| Alternative | Best for | Standout | Biggest weakness | Learning curve | Price |
|---|---|---|---|---|---|
| Proton Mailreference | privacy-conscious individuals, journalists, and small teams who want end-to-end encrypted email with open-source, independently audited clients rather than a mainstream provider that can technically read stored mail | Zero-access encryption paired with open-source, independently audited client apps, so Proton itself cannot decrypt a Mail Plus or Unlimited inbox even under legal compulsion. | The free tier caps storage at just 1 GB and one address, and the higher-value Unlimited and Family tiers bundle VPN, Drive, and Pass features that email-only switchers may not need, pushing the effective per-mailbox cost above single-purpose providers like Fastmail. | Low | Free tier · paid from $3.99/mo |
| Gmail | individuals who want a free, reliable, spam-filtered inbox with strong search, and businesses wanting professional email bundled with Google's collaboration suite | Search-driven inbox management with strong spam filtering and tabbed auto-categorization, tightly integrated with Google Meet, Chat, Calendar, and Drive from the same interface. | Free personal accounts show ads in the inbox and rely on automatic tab categorization that can bury important emails in Promotions or Updates; storage is shared across Gmail, Drive, and Photos rather than dedicated to email, so heavy attachment use eats into the same 15GB quota as everything else. | Low | Free tier · paid from $7/mo |
| Outlook | individuals who want a free, ad-supported webmail and calendar client, with the option to upgrade to an ad-free inbox, larger storage, and Copilot AI through a Microsoft 365 subscription | Unified email, calendar, contacts, and (on Microsoft 365 plans) Copilot AI drafting in one interface, tightly integrated with Word, Excel, and Teams rather than functioning as a standalone mail app. | The standalone, low-cost Outlook.com Premium subscription was discontinued for new users in 2017, so removing ads and getting 100GB of storage now requires a full Microsoft 365 subscription starting at $9.99/month rather than a cheaper email-only upgrade; reviewers also report slowdowns and sync issues with large inboxes and unreliable attachment search. | Low | Free tier · paid from $9.99/mo |
| Fastmail | privacy-conscious individuals and small businesses who want custom-domain email with no ads or content scanning and don't mind paying from day one | Unlimited masked email aliases for signing up to services without exposing a real address, combined with full custom-domain support and standards-based IMAP/CalDAV/CardDAV access on every plan, including the cheapest tier. | No free tier at all — every account requires payment after the 30-day trial — and search and spam filtering are generally considered weaker than Gmail's, since Fastmail doesn't have Google-scale machine learning behind its spam engine. | Low | From $4/mo |
| Tuta | privacy-conscious individuals and organizations, including journalists, healthcare providers, and nonprofits, who want end-to-end encrypted email and calendar with open-source, auditable clients | Post-quantum end-to-end encryption (TutaCrypt) covering both email and calendar by default, with fully open-source client apps auditable on GitHub. | No PGP or S-MIME support for encrypted mail to external, non-Tuta recipients, and no IMAP/SMTP access, so mailboxes only work through Tuta's own apps and webmail. | Low | Free tier · paid from $3.25/mo |
| Zoho Mail | small businesses and startups that want ad-free, custom-domain email without Google Workspace or Microsoft 365 per-seat pricing | A genuinely usable free tier (5 users, 5GB each, one custom domain, no credit card) alongside paid plans that bundle email with a full office suite (WorkDrive, Writer, Sheet, Show, Cliq) at a fraction of Google Workspace's or Microsoft 365's per-seat cost. | The free plan doesn't include IMAP/POP/ActiveSync access, so free users are limited to Zoho's own web and mobile apps rather than a third-party mail client, and the paid Mail-only tiers require annual billing with no month-to-month option. | Low | Free tier · paid from $1/mo |
Proton Mail
Gmail
Outlook
Fastmail
Tuta
Zoho Mail1.Gmail — best Proton Mail alternative for individuals who want a free, reliable, spam-filtered inbox with strong search, and businesses wanting professional email bundled with Google's collaboration suite
Gmail is the best Proton Mail alternative for anyone who wants a free, high-storage inbox without managing encryption keys, since Gmail's free tier includes 15GB of storage shared across Gmail, Drive, and Photos, 15 times more than Proton Mail's free 1GB plan. Gmail holds a 4.8/5 rating from 13,516 Capterra reviews, over 100 times the review volume behind Proton Mail's own 4.5/5 score from 122 reviews. Gmail's spam filtering and search operators are widely regarded as best-in-class, and its tabbed inbox (Primary, Promotions, Social) automatically sorts incoming mail, a triage feature Proton Mail's client does not build in. Business use runs through Google Workspace starting around $7/user/month for a custom domain, comparable to Proton Mail's own $3.99/month Mail Plus tier for 15GB and a custom domain. Proton Mail is still the better choice for anyone who wants zero-access encryption on their inbox: Gmail's free accounts show ads and Google can technically access stored message content for ad personalization and other purposes, while Proton Mail's zero-access encryption means Proton itself cannot read a Mail Plus or Unlimited inbox even under legal compulsion.
Compared to Proton Mail: 15GB free storage vs Proton Mail's 1GB free tier, 100x the review volume, but no zero-access encryption and ad-supported free accounts
Wins:15GB of free storage shared across Gmail, Drive, and Photos, versus Proton Mail's free 1GB plan · 4.8/5 rating from 13,516 Capterra reviews, over 100 times Proton Mail's 122-review sample · Tabbed inbox automatically categorizes incoming mail, a triage feature Proton Mail's client doesn't build in
Loses:No zero-access encryption; message content is not end-to-end encrypted the way Proton Mail's paid tiers are · Free accounts show ads in the inbox, unlike Proton Mail's ad-free interface at every tier · Requires a signed-in Google account tied to broader ad personalization, a tracking model Proton Mail's Swiss-jurisdiction, no-phone-number signup avoids
Pros
- Free tier is genuinely capable, with strong spam filtering and powerful search operators.
- Tight integration with Google Meet, Chat, Calendar, and Drive inside the same interface.
- Business (Workspace) tiers add a custom domain and admin controls without switching providers.
- Broad platform support with reliable offline access and cross-device sync.
Cons
- Free accounts show ads, and the automatic tab system (Promotions, Social, Updates) can bury important messages.
- 15GB free storage is shared across Gmail, Drive, and Photos rather than dedicated to email alone.
- Some advanced settings and filters are not intuitive to configure for less technical users.
- Business pricing tiers beyond Starter require checking Google's site directly, as exact per-tier pricing isn't always shown plainly.
Pricing: Free tier · paid from $7/mo — Free (15GB) vs Proton Mail's free (1GB); Google Workspace Business Starter ~$7/user/month vs Proton Mail's Mail Plus at $3.99/month
2.Outlook — best Proton Mail alternative for individuals who want a free, ad-supported webmail and calendar client, with the option to upgrade to an ad-free inbox, larger storage, and Copilot AI through a Microsoft 365 subscription
Outlook is the best Proton Mail alternative for users who already pay for or want Word, Excel, and Teams alongside their inbox, since premium, ad-free Outlook with 100GB of mailbox storage and Copilot AI drafting comes bundled into a Microsoft 365 subscription rather than sold as email alone. Outlook holds a 4.5/5 rating from 2,501 Capterra reviews, over 20 times the review volume behind Proton Mail's own 122 reviews. Outlook's free tier is ad-supported but requires no subscription, while removing ads and gaining 100GB storage requires Microsoft 365 Personal at $9.99/month, more expensive than Proton Mail's Mail Plus tier at $3.99/month for 15GB. Outlook integrates natively with Word, Excel, PowerPoint, and Teams, an office-suite bundle Proton Mail's Unlimited plan does not match, since Proton bundles VPN, Drive, and Pass instead. Proton Mail is still the better choice for anyone who wants zero-access encryption or doesn't need an Office subscription: Outlook's standalone, low-cost Premium subscription was discontinued for new users in 2017, so ad removal now requires the full $9.99/month Microsoft 365 plan rather than an email-only upgrade, and reviewers report slowdowns and sync issues with large mailboxes.
Compared to Proton Mail: bundled with Word, Excel, and Teams via Microsoft 365, 20x the Capterra review volume, but $9.99/month for ad-free vs Proton Mail's $3.99/month Mail Plus and no zero-access encryption
Wins:Bundled with the full Word, Excel, PowerPoint, and Teams suite through Microsoft 365, unlike Proton Mail's VPN/Drive/Pass bundle · 4.5/5 rating from 2,501 Capterra reviews, over 20 times Proton Mail's 122-review sample · Free tier requires no subscription at all, offering a usable webmail client with calendar and contacts
Loses:No zero-access encryption; Outlook cannot guarantee the same inability to read stored messages that Proton Mail's paid tiers offer · Ad-free access and 100GB storage require a $9.99/month Microsoft 365 subscription, above Proton Mail's $3.99/month Mail Plus for 15GB · Reviewers report performance slowdowns and sync issues with large mailboxes, plus unreliable attachment search
Pros
- Free tier is a fully usable webmail client with calendar and contacts, no subscription required.
- Premium features (ad-free, 100GB mailbox, Copilot) are bundled into a Microsoft 365 subscription rather than sold separately.
- Deep integration with Word, Excel, PowerPoint, and Teams for Microsoft 365 subscribers.
- Broad platform support across web, Windows, macOS, iOS, and Android.
Cons
- Ads appear throughout the free tier.
- Ad-free and expanded-storage upgrades require a full Microsoft 365 subscription, not a low-cost Outlook-only add-on.
- Reviewers report performance slowdowns and sync issues with large mailboxes.
- Attachment search can be unreliable, according to user reviews.
Pricing: Free tier · paid from $9.99/mo — Free (ad-supported) vs Proton Mail's free (1GB); Microsoft 365 Personal $9.99/month (ad-free, 100GB) vs Proton Mail's Mail Plus at $3.99/month (15GB) (verified undefined NaN, NaN)
3.Fastmail — best Proton Mail alternative for privacy-conscious individuals and small businesses who want custom-domain email with no ads or content scanning and don't mind paying from day one
Fastmail is the best Proton Mail alternative for users who want a provider that has never run an ad-supported free tier at all, since Fastmail runs entirely on paid plans starting at $6/month ($5/month billed annually) with no ads and no scanning of email content for advertising, a business model closer to Proton Mail's own paid-first approach than Gmail's or Outlook's free tiers. Fastmail's Individual plan includes 60GB of combined mail, calendar, and contacts storage, four times Proton Mail's Mail Plus tier at 15GB, though Fastmail's $6/month price is above Proton Mail's $3.99/month Mail Plus. Both providers support custom domains and masked or hide-my-email aliases on every plan. Fastmail holds a 4.9/5 rating, the highest of any alternative here, though from only 11 Capterra reviews, a far thinner sample than Proton Mail's own 122 reviews. Proton Mail is still the better choice for anyone who wants a free tier or zero-access encryption: Fastmail has no free tier at all, every account requires payment after a 30-day trial, and Fastmail's search and spam filtering are generally considered weaker than Gmail's, since Fastmail doesn't have Google-scale machine learning behind its spam engine, nor does it offer Proton Mail's zero-access encryption guarantee.
Compared to Proton Mail: 60GB storage vs Proton Mail's 15GB Mail Plus, no ads or content scanning at any tier, but no free plan and no zero-access encryption
Wins:60GB of combined mail, calendar, and contacts storage on the Individual plan, four times Proton Mail's 15GB Mail Plus tier · No ads and no scanning of email content for advertising at any tier, including the cheapest plan · Standards-based IMAP/CalDAV/CardDAV access works with any email client, avoiding vendor lock-in
Loses:No free tier at all; every account requires payment after a 30-day trial, unlike Proton Mail's free 1GB plan · No zero-access encryption; Fastmail cannot guarantee the same inability to read stored messages that Proton Mail's paid tiers offer · Search and spam filtering are generally considered weaker than Gmail's machine-learning-driven systems
Pros
- No ads and no scanning of email content for advertising, unlike free webmail providers.
- Custom domain support and unlimited masked email aliases included on every plan, even the cheapest.
- Standards-based IMAP/CalDAV/CardDAV access works with any email client, avoiding vendor lock-in.
- Business Professional tier includes a legal-compliance email retention archive.
Cons
- No free tier; every plan requires payment after the 30-day trial ends.
- Spam filtering and search are generally weaker than Gmail's machine-learning-driven systems.
- No AI-assisted writing or summarization features that Gmail and Outlook now offer.
- Base Individual plan's 60GB storage is smaller than Gmail's free 15GB-plus-cheap-upgrade model once photos and attachments accumulate.
Pricing: From $4/mo — $6/month Individual (60GB) vs Proton Mail's $3.99/month Mail Plus (15GB); no free tier vs Proton Mail's free 1GB plan (verified undefined NaN, NaN)
4.Tuta — best Proton Mail alternative for privacy-conscious individuals and organizations, including journalists, healthcare providers, and nonprofits, who want end-to-end encrypted email and calendar with open-source, auditable clients
Tuta is the best Proton Mail alternative for users who want encryption that extends to the calendar as well as email, since Tuta encrypts both using TutaCrypt, a post-quantum cryptography scheme designed to resist decryption by future quantum computers, a scope Proton Mail's own end-to-end encryption does not extend to calendar entries in the same way. Both providers ship fully open-source, independently audited client apps and offer a free tier capped at 1GB of storage, matching each other at the entry level. Tuta's paid Revolutionary plan costs roughly $3.25/month (about €3, discounted on annual billing), below Proton Mail's Mail Plus at $3.99/month, though Tuta's Revolutionary tier includes only 20GB of storage versus Proton Mail's 15GB Mail Plus at a similar price point. Tuta has no external ratings on record in our listing data to compare against Proton Mail's 4.5/5 score from 122 Capterra reviews. Proton Mail is still the better choice for anyone who needs to connect a third-party email client or send encrypted mail to non-Proton recipients: Tuta does not support IMAP or SMTP at all, so its mailboxes only work through Tuta's own apps, and Tuta has no PGP or S-MIME support for encrypting messages to external recipients, while Proton Mail's Bridge app connects Mail Plus and Unlimited accounts to standard IMAP clients like Outlook.
Compared to Proton Mail: post-quantum TutaCrypt encryption covering both email and calendar, cheaper Revolutionary tier at $3.25/month, but no IMAP/SMTP or PGP support for external clients
Wins:Post-quantum TutaCrypt encryption applies to both email and calendar, a scope Proton Mail's encryption doesn't extend to calendar entries the same way · Revolutionary tier costs about $3.25/month, below Proton Mail's $3.99/month Mail Plus · Fully open-source clients (GPL-3.0) with F-Droid and direct APK distribution outside the Play Store
Loses:No IMAP or SMTP support at all, so mailboxes only work through Tuta's own apps, unlike Proton Mail's Bridge app for standard clients · No PGP or S-MIME support for encrypted messages to non-Tuta recipients, a gap Proton Mail's broader interoperability doesn't have to the same degree · No external ratings on record in our listing data, versus Proton Mail's 4.5/5 score from 122 Capterra reviews
Pros
- Post-quantum end-to-end encryption (TutaCrypt) applied to both email and calendar, not just message bodies.
- Fully open-source clients (GPL-3.0) available for independent security audit, plus F-Droid and direct APK downloads outside the Play Store.
- Revolutionary and Legend plans include unlimited calendars and labels, with custom domain support starting at the Revolutionary tier.
- Ad-free, with no tracking or behavioral advertising built into the business model.
Cons
- No PGP or S-MIME support for encrypted messages to non-Tuta recipients.
- No IMAP or SMTP access, so Tuta inboxes can only be used through Tuta's own apps and webmail, not third-party clients like Outlook or Thunderbird.
- Free tier is capped at 1GB storage with no custom domain or extra email aliases.
Pricing: Free tier · paid from $3.25/mo — Free (1GB) matches Proton Mail's free tier; Revolutionary ~$3.25/month (20GB) vs Proton Mail's Mail Plus at $3.99/month (15GB)
5.Zoho Mail — best Proton Mail alternative for small businesses and startups that want ad-free, custom-domain email without Google Workspace or Microsoft 365 per-seat pricing
Zoho Mail is the best Proton Mail alternative for small teams that want a free, ad-free, custom-domain inbox for more than one person, since Zoho Mail's free plan covers up to 5 users at 5GB each with one custom domain and no credit card required, while Proton Mail's free plan is limited to a single address and 1GB. Zoho Mail's paid Mail Lite tier costs just $1/user/month billed annually, well below Proton Mail's $3.99/month Mail Plus, though Mail Lite's 10GB storage is smaller than Mail Plus's 15GB. Zoho Mail holds a 4.5/5 rating from 1,067 Capterra reviews, nearly 9 times the review volume behind Proton Mail's own 122 reviews. Zoho also bundles Mail into Workplace plans starting at $3/user/month with WorkDrive, Writer, Sheet, and Show, a fuller office suite than Proton Mail's Unlimited plan, which bundles VPN, Drive, and Pass instead. Proton Mail is still the better choice for anyone who wants zero-access encryption or IMAP access on a free plan: Zoho Mail's free tier doesn't include IMAP/POP/ActiveSync access, limiting free users to Zoho's own apps, and Zoho Mail has no end-to-end or zero-access encryption the way Proton Mail's paid tiers guarantee.
Compared to Proton Mail: a free tier for up to 5 users vs Proton Mail's single-address 1GB free plan, cheaper $1/user/month Mail Lite, but no zero-access encryption and no IMAP on the free tier
Wins:Free plan covers up to 5 users at 5GB storage each with a custom domain, versus Proton Mail's single-address, 1GB free plan · Mail Lite costs $1/user/month billed annually, well below Proton Mail's $3.99/month Mail Plus · 4.5/5 rating from 1,067 Capterra reviews, nearly 9 times Proton Mail's 122-review sample
Loses:No zero-access encryption; Zoho cannot guarantee the same inability to read stored messages that Proton Mail's paid tiers offer · Free tier doesn't include IMAP/POP/ActiveSync access, limiting users to Zoho's own web and mobile apps · Mail-only paid tiers (Lite, Premium) require annual billing with no monthly option, unlike Proton Mail's monthly-or-annual choice
Pros
- Free plan covers up to 5 users with 5GB storage each and no credit card required.
- Paid plans are substantially cheaper per seat than Google Workspace or Microsoft 365 for comparable mailbox storage.
- Workplace plans bundle a full office suite (WorkDrive, Writer, Sheet, Show, Cliq) rather than email alone.
- S/MIME encryption, e-Discovery, and data loss prevention are available on Premium and above.
Cons
- Free tier doesn't include IMAP/POP/ActiveSync, limiting access to Zoho's own apps.
- Mail-only plans (Lite, Premium) require annual billing with no monthly option.
- Smaller ecosystem of third-party integrations than Google Workspace or Microsoft 365.
- Exact current pricing wasn't readable from Zoho's JavaScript-rendered pricing page; figures above reflect Zoho's documented historical pricing structure and should be re-verified before publishing.
Pricing: Free tier · paid from $1/mo — Free (5 users, 5GB each) vs Proton Mail's free (1 user, 1GB); Mail Lite $1/user/month vs Proton Mail's Mail Plus at $3.99/month