# tutao/tutanota

Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.

Repository: https://github.com/tutao/tutanota
Canonical: https://ross.abutalabs.com/products/tutanota
Homepage: https://tuta.com
Language: TypeScript
License: GPL-3.0
License Family: copyleft
Topics: javascript, mithril, encryption, email, tutanota, security, privacy
Last push: 2026-08-26T17:26:44+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 4419, "days_push": 7, "days_rel": 8, "gap_med": 0, "n_releases_24m": 510}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7874, forks 637 (observed 2026-08-28T04:10:08.512557+00:00)

## What it is
Tuta Mail (formerly Tutanota) is an open-source, end-to-end encrypted email service with integrated encrypted calendar and contacts, available as web, desktop, and mobile apps. It focuses on privacy with zero-knowledge design and post-quantum cryptography.

## Use cases
- send end-to-end encrypted emails to anyone
- private email account without tracking or ads
- encrypted calendar and contact sync across devices
- privacy-focused alternative to Gmail
- use custom domain with secure email hosting
- access email offline on mobile and desktop

## When to choose
- you need encrypted email and calendar with strong privacy guarantees
- you want a free or paid ad-free email service with apps on all platforms
- you need post-quantum, zero-knowledge encryption for communications

## When to avoid
- you need full IMAP/SMTP interoperability with standard email clients
- you require self-hosting of the mail server
- you need large attachment sizes or very high storage on the free tier

## Facets
- artifact type: application
- maturity: active
- function: email, cryptography, security, privacy, self-hosted
- domain: privacy, email, security, cross-platform
- platform: cross-platform
- tags: end-to-end-encryption, email-client, calendar, zero-knowledge, post-quantum-cryptography, email-service, web-server, android, ios, desktop, javascript

## Member repositories
- tutao/tutanota (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:08.512557+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:33:44.006931+00:00, confidence not recorded.
  - readme: https://github.com/tutao/tutanota (fetched 2026-08-28T04:10:08.512557+00:00, sha 19f1d51de86f)
  - homepage: https://tuta.com (fetched 2026-08-29T08:30:31.426739+00:00, sha 4f3a5f4e45b7)
  - site_page: https://tuta.com/pricing (fetched 2026-08-29T08:30:31.436309+00:00, sha 413292b5925a)
- Data as of 2026-08-30T08:39:29.467469+00:00.