# Proton Mail review

A Swiss, end-to-end encrypted email service with zero-access encryption and open-source clients, free for 1 GB or from $3.99/month billed annually for 15 GB and custom domains.

By Noah — last updated & pricing verified September 15, 2026.

> **Proton Mail** is an end-to-end and zero-access encrypted email service from Proton AG, a Swiss company, built so that neither third parties nor Proton itself can read stored messages.

It starts with a free plan (1 GB storage, 1 address) and scales through Mail Plus (15 GB, 10 aliases, 1 custom domain) to Proton Unlimited, which pools 500 GB of storage across Mail, Drive, and Calendar and bundles in Proton VPN and Pass. A Family plan extends Unlimited to up to 6 people with shared storage. The client apps — web, desktop (via the Bridge app for IMAP access), iOS, and Android — are open source and independently security-audited, and Proton publishes its infrastructure under Swiss data-protection law rather than US or EU jurisdiction. Proton Mail competes less on feature parity with Gmail or Outlook and more on the guarantee that Proton cannot decrypt a user's inbox even under legal compulsion.

## Facts

- Website: https://proton.me
- Pricing: Free tier · paid from $3.99/mo
- License: Open core
- Platforms: web, windows, macos, linux, ios, android
- Best for: 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
- Standout feature: 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.
- Biggest weakness: 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.
- Third-party ratings: Capterra 4.5/5 (122 reviews)
- Categories: [Email Providers & Clients](https://findalternative.to/categories/email-providers)

## Pricing snapshot

| Plan | Price | Notes |
| --- | --- | --- |
| Proton Free | $0/mo | 1 GB storage (expandable to 1.5 GB via onboarding tasks), 1 email address, end-to-end encryption, basic calendar. |
| Mail Plus | $3.99/mo | Billed annually (~$47.88/year); $4.99/month if billed monthly. 15 GB storage, 10 hide-my-email aliases, 1 custom domain, priority support. |
| Proton Unlimited | $9.99/mo | Billed annually (~$119.88/year); $12.99/month if billed monthly. 500 GB pooled storage across Mail, Drive, Calendar, plus Proton VPN and Pass. |
| Proton Family | $19.99/mo | Billed annually; up to 6 members sharing 3 TB total storage and all Unlimited features. |

## Pros and cons

- Pro: Zero-access encryption means Proton cannot read message content on any paid plan.
- Pro: Open-source, independently audited client apps across web, desktop, iOS, and Android.
- Pro: No phone number required to sign up, and Swiss jurisdiction outside US/EU data-sharing agreements.
- Pro: Bridge app connects Proton Mail to standard IMAP clients like Outlook or Apple Mail on Mail Plus and up.
- Con: Free tier is limited to 1 GB storage and a single email address.
- Con: Higher tiers bundle VPN, Drive, and Pass, which raises the effective price for users who only want email.
- Con: Custom domain support starts at just 1 domain on Mail Plus, fewer than some business-focused competitors.

## AI summary

- Proton Mail's free plan includes 1 GB of storage and 1 email address.
- Mail Plus starts around $3.99/month billed annually (15 GB storage, 1 custom domain, 10 aliases).
- Proton Unlimited bundles Mail, VPN, Drive, Pass, and Calendar with 500 GB of pooled storage.
- Proton Mail holds a 4.5/5 rating from 122 reviews on Capterra.
- Proton Mail's client apps are open source and independently security-audited, available on web, Windows, macOS, Linux, iOS, and Android.
- Best for: privacy-conscious individuals and small teams who want end-to-end encrypted email with open-source, audited clients
- Pricing: Free for 1 GB; Mail Plus from $3.99/month billed annually (15 GB); Proton Unlimited from $9.99/month billed annually (500 GB plus VPN, Drive, Pass).
- Top alternatives: Gmail, Outlook, Fastmail, Tuta, Zoho Mail
- Limitation: Free tier storage is limited to 1 GB and one address.
- Limitation: Bundled VPN/Drive/Pass features raise the effective cost for email-only users.
- Limitation: Only 1 custom domain on the entry paid tier.

## Alternatives

5 vetted alternatives to Proton Mail: https://findalternative.to/proton-mail — top picks: Gmail, Outlook, Fastmail

## Comparisons

- https://findalternative.to/compare/gmail-vs-proton-mail
- https://findalternative.to/compare/google-workspace-vs-proton-mail
- https://findalternative.to/compare/outlook-vs-proton-mail

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