Proton Mail vs mailbox.org: which is better? Comparison 2026
By our public methodology Proton Mail scores 80 out of 100 and mailbox.org scores 70. Below: the factors and facts where they differ, each fact with its source.
Score breakdown
| Proton Mail | mailbox.org | |
|---|---|---|
| Privacy & security | 100 | 86 |
| Price | 51 | 28 |
| Features | 86 | 88 |
| Transparency & track record | 73 | 73 |
Pros and cons
Proton Mail
- End-to-end encryption is built in
- You can use your own domain ([email protected])
- Security checked by an independent audit or certification
- Free plan available
mailbox.org
- End-to-end encryption is built in
- You can use your own domain ([email protected])
- Security checked by an independent audit or certification
- Works with standard mail apps via IMAP/SMTP
- No free plan
Facts side by side
| Fact | Proton Mail | mailbox.org |
|---|---|---|
| Built-in end-to-end encryption | Yes proton.me | Yes mailbox.org |
| Independent audit or security certification | Yes proton.me | Yes mailbox.org |
| Open source apps | Yes proton.me | Not verified |
| Hardware key sign-in (FIDO2/U2F/YubiKey) | Yes proton.me | Yes kb.mailbox.org |
| Cheapest paid plan per month (monthly billing) | $4.99 proton.me | $4.49 mailbox.org |
| Free plan | Yes proton.me | No mailbox.org |
| Mail storage on the free plan (GB) | 0.5 proton.me | 0 mailbox.org |
| Your own domain | Yes proton.me | Yes mailbox.org |
| Mail storage on the cheapest paid plan (GB) | 15 proton.me | 20 mailbox.org |
| IMAP/SMTP access | Yes proton.me | Yes mailbox.org |
| Aliases and extra addresses | Yes proton.me | Yes mailbox.org |
| Founded | 2014 proton.me | 2014 mailbox.org |
| Transparency report | Yes proton.me | Yes mailbox.org |
| Company headquarters | Switzerland proton.me | Not verified |
| Where mail is stored | Switzerland proton.me | Germany mailbox.org |
| Company | Proton AG proton.me | Heinlein Group mailbox.org |
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