Mozilla Thunderbird vs Proton Mail
No leader: the top candidate Mozilla Thunderbird has only 0.27 confidence (low), below the 0.35 needed to declare a winner. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
Capabilities
Feature-by-feature on the axes that matter for email clients. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
Mozilla Thunderbird
Thunderbird consolidates email, calendars, and contacts from multiple accounts into one interface. It runs on Windows, Mac, and Linux, is funded by user donations, and prioritizes privacy by never collecting personal data or serving advertisements.
Proton Mail
An email platform that uses end-to-end encryption to protect message contents from server access. Funded by subscribers rather than data exploitation, it provides privacy-focused communication for individuals and businesses with features like password-protected emails, alias generation, and team management tools.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Proton Mail
- Essential-
- Unlimited logins, notes, and credit cards
- Browser, mobile, and desktop apps
- Secure vault, item and link sharing
- Built-in 2FA authenticator
- Dark Web Monitoring
- +2 more
- Plus-
- SSO and SCIM
- Access to Proton Sentinel
- File storage up to 100 MB
- SIEM integration
- Command line interface (CLI)
- +1 more
- Workspace Standard-
- 1 TB storage per user
- 15 custom email domains
- Secure personal and shared calendar
- Cloud storage and sharing
- User permissions and access management
- +1 more
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
Mozilla Thunderbird
Not documented yet.
Proton Mail
- Gmail
- Outlook
- Yahoo
- Apple Mail
- Thunderbird
- Okta
- Microsoft Entra ID
- ADFS
- Edugain
- SimpleLogin
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.