Atomic Blend vs Proton
Two privacy-first suites — one you can read the source of and host yourself.
Proton built its reputation on encrypted email and a growing set of privacy apps. Atomic Blend takes the same privacy-first stance and adds two things Proton does not offer: a fully open-source backend you can audit, and the ability to self-host the entire suite on your own infrastructure.
Both encrypt your data end to end. The real difference is control: with Atomic Blend, nothing about how your data is handled is a black box, and you are never locked into our servers.
| Atomic Blend | Proton | |
|---|---|---|
| End-to-end encrypted | ||
| Open sourceProton open-sources its apps, not its backend. | ||
| Self-hostable | ||
| All-in-one (mail · calendar · tasks · notes) | ||
| No per-seat pricing | ||
| Export & own your data |
Why people switch from Proton
Self-host the whole stack
Proton is cloud-only. Atomic Blend can run entirely on your own servers under AGPLv3 — no vendor, no lock-in.
A fully open backend
Proton open-sources its apps but not its server. With Atomic Blend you can read and audit every line, including the backend.
Flat, honest pricing
A flat €2/mo service fee plus metered storage — no per-seat pricing tiers.
Where Proton is still the better choice
- A more mature product with a longer track record and larger team.
- Established apps with broad platform coverage and polish.
- A well-known brand with audited cryptography.
Comparison reflects publicly documented features as of 2026. Names are trademarks of their respective owners.