ProtonMail is an end-to-end encrypted email service based in Switzerland, offering protected emails, contacts, and calendar features. It uses zero-knowledge encryption, meaning even ProtonMail staff cannot access user data, and includes secure messaging between ProtonMail users.
| Pricing from | Free (limited), CHF 4.99/month (Mail Plus) |
| Best for | Professionals requiring encrypted email communications with external contacts and privacy-first cloud storage. |
| Website | protonmail.com |
Strengths and trade-offs
- End-to-end encryption for external recipients via public key infrastructure
- Includes encrypted calendar and contact storage
- Encrypted email to non-ProtonMail users requires separate password sharing
- Free tier offers limited storage and features
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