Growth · alternatives · 2026

24 alternatives to Tutanota

Encrypted email & calendar

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Tutanota launched in 2019; newer entries below may have overtaken it.

1
Tutanota▲6
Encrypted. open-source email & calendar service
2019 · tuta.com · its alternatives →
2
Tutanota▲5
Secure email for everybody
2019 · tuta.com · its alternatives →
3
Exchange end-to-end encrypted emails with anybody▲8
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. - tutao/tutanota
2014 · github.com · its alternatives →
4
Tutanota▲2
Get your encrypted mailbox for free.
2015 · tuta.com · its alternatives →
5
Turtl – A secure, encrypted Evernote alternative▲236
The safe way to remember everything. Take all your important data with you.
2016 · turtl.it · its alternatives →
6
Secure Calendar▲75
Privacy respecting calendar
2019 · securecalendar.online · its alternatives →
7
OI Calendar▲78
Encrypted, decentralized alternative to Google calendar
2019 · cal.openintents.org · its alternatives →
8
We’ve created Tutanota, an encrypted email App (GPLv3)▲5
Tuta guarantees your data stays private for free & without ads. Quantum-resistant encryption makes Tuta the best secure technology solution to protect your privacy.
2014 · tutanota.com · its alternatives →
9
Calendar Signatures by Warmly▲305
LinkedIn insights right in your calendar, 100% free
2021 · getnametags.com · its alternatives →
10
Dash▲122
Private, encrypted OSS notes app
2025 · dashnote.io · its alternatives →
11
Calendly for Chrome▲250
Schedule meetings without leaving your inbox
2018 · calendly.com · its alternatives →
12
ProtonMail▲199
End-to-end encrypted email - now on iOS & Android
2016 · proton.me · its alternatives →
13
Criptext▲83
Encrypt, track, and recall your emails
2015 · its alternatives →
14
Hop Encrypted Email▲132
Completely private chat email, w/ encrypted email messaging
2017 · spikenow.com · its alternatives →
15
Tusk▲128
A refined open-source desktop app for Evernote 🐘
2019 · github.com · its alternatives →
16
Astro 3.0▲264
Intelligent inbox and calendar for iOS, Android, Mac & Slack
2018 · its alternatives →
17
ProtonMail▲144
Encrypted email, made simple. Now open to everybody.
2015 · proton.me · its alternatives →
18
EmailPK ▲69
Instant encrypted email
2014 · diafygi.github.io · its alternatives →
19
Calendly 2.0▲197
Easily schedule meetings without the back-and-forth emails
2021 · calendly.com · its alternatives →
20
Turtl▲131
Your open source private space (Evernote alternative) 🐢
2017 · turtlapp.com · its alternatives →
21TP
TutaCrypt, post-quantum encryption protocols for securing emails [pdf]▲15
Hi HN, we are the developers from Tuta (formerly Tutanota), the German end-to-end encrypted email provider, and we recently released the world's first post-quantum encryption for email. We have included a full technical write-up of the cryptography involved in these changes and we have released it for open public review. This document specifies TutaCrypt, a protocol designed for hybrid email encryption in Tuta Mail. The protocol combines a classical Elliptic-Curve-Diffie-Hellman key exchange with a post-quantum KEM. The goal is to replace the usage of RSA in Tuta Mail. In the remainder of…
2024 · tuta.com · its alternatives →
22
Secure Swiss Data Encrypted Mobile App▲69
Fully encrypted email app, hosted exclusively in Switzerland
2017 · swissfinancestartups.com · its alternatives →
23
M for iOS▲126
Email app with automatic encryption
2015 · mynigma.org · its alternatives →
24EI
EmailPK – Instant encrypted email▲53
2014 · diafygi.github.io · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →