# 1 Best Open-Source Alternatives to Proton Mail in 2026

By Noah — last updated & pricing verified September 15, 2026.

> 1 of the 5 Proton Mail alternatives we list qualify for this filter. The [full list](https://findalternative.to/proton-mail) is the canonical page.

| Alternative | Best for | Price | Details |
| --- | --- | --- | --- |
| Tuta | privacy-conscious individuals and organizations, including journalists, healthcare providers, and nonprofits, who want end-to-end encrypted email and calendar with open-source, auditable clients | Free tier · paid from $3.25/mo | https://findalternative.to/tuta/about |

All 5 alternatives to Proton Mail: https://findalternative.to/proton-mail

---

Markdown mirror of https://findalternative.to/proton-mail/open-source — findalternative.to, honestly ranked software alternatives. AI info: https://findalternative.to/ai