Alternatives

Products that do what Aster Mail does

Quantum-safe, private end-to-end encrypted, zero access mail

1. 1
   BMail▲93

   Encrypt emails and attachments

   2024

2. 2FE
   Forward Email – Open-Source Quantum Safe Encrypted Email Service▲35

   2023 · forwardemail.net

3. 3EE
   Easy Email Encryption inside Gmail (Alpha, Open-Source)▲170

   2013 · streak.com

4. 4
   ProtonMail▲199

   End-to-end encrypted email - now on iOS & Android

   2016

5. 5
   Hansel by Seedling▲106

   Your email, your server, your keys so you're not locked out

   21d ago · github.com

6. 6
   ASTIS Mail▲12

   Encrypt Gmail/M365 mail, calendar & attachments

   Jun 2026 · mail.astis.io

7. 7
   Secria▲22

   Post-quantum secure email, private by design

   2025

8. 8
   Skiff Mail▲165

   Private, end-to-end encrypted, open-source mail

   2022

9. 9ET
   End-to-end encrypted email, based in Switzerland▲45

   2014 · protonmail.ch

10. 10TP
    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

11. 11
    ProtonMail▲82

    End-to-end encrypted email, based in Switzerland.

    2014

12. 12
    Beeble▲314

    The safest platform to exchange emails and store files

    2024

13. 13
    Atomic Mail Agentic▲268

    Let your agents read, send, and react to email autonomously

    Jun 2026 · atomicmail.ai

14. 14
    ProtonMail▲144

    Encrypted email, made simple. Now open to everybody.

    2015

15. 15
    Just Mail▲64

    Secured email platform based on distributed storage network

    2014

16. 16EE
    Encrypted emails based on Signal protocol with post-quantum algorithms▲10

    Hi HN, we have recently completed a research project on how to encrypt emails with post-quantum secure algorithms as well as Forward Secrecy. We'd love to hear your feedback and discuss technical issues. The paper can be found here: https://eprint.iacr.org/2021/875

    2021

17. 17
    Hop Encrypted Email▲132

    Completely private chat email, w/ encrypted email messaging

    2017

18. 18EI
    EmailPK – Instant encrypted email▲53

    2014 · diafygi.github.io

19. 19
    Inky 3▲160

    Send encrypted emails using your current email provider

    2016

20. 20
    Jumble▲88

    E-mail encryption plugin for Chrome

    2014

21. 21QO
    Qrkey – Offline private key backup on paper▲76

    2025 · github.com

22. 22
    Misakey 1.0▲112

    Send encrypted documents & messages to anyone

    2020

23. 23GC
    gpgsend.com - encrypted emails from your browser.▲26

    2011 · gpgsend.com

24. 24IA
    InstantCryptor – AES256 Encryption for Dropbox and Google Drive▲35

    2015 · instantcryptor.com

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