Fastmail Pty Ltd
Fastmail
Independent, ad-free paid email hosting with its own apps and custom domains.
Price, checked Oct 26, 2026From $3/user/moTry Fastmail free
Fastmail vs Proton Mail
Pricing, platforms and features side by side, where the two differ, and who each one suits.
Fastmail pricing and alternatives
Proton AG
Proton Mail
End-to-end encrypted email from Switzerland-based Proton, with a free plan.
Price, checked Oct 26, 2026Free plan · paid from $3.99/user/moTry Proton Mail free
Side by side
| Feature | Fastmail | Proton Mail |
|---|---|---|
| Price | From $3/user/mo | Free plan · paid from $3.99/user/mo |
| Accounts | Gmail, iCloud, Any IMAP | – |
| AI features | – | Yes |
| Shared inbox | Yes | – |
| Works on | Mac, Windows, Linux, iPhone, Android, Web | Mac, Windows, Linux, iPhone, Android, Web |
Rows where the two differ come first. Prices from each vendor's pricing page.
Where only one fits
- FastmailGmailiCloudSomething else
- must-haves
- FastmailShared team inbox
- Proton MailAI replies and summaries
- price
- Proton MailFree
Ranked in our guides
| Guide | Fastmail | Proton Mail |
|---|---|---|
| Best email apps for Mac | – | #10 |
| Best AI email apps | – | #9 |
We don't test apps ourselves. Features and prices come from each vendor's own site; guide ranks follow what independent reviewers recommend.