Growth · alternatives · 2026

24 alternatives to ASTIS Mail

Encrypt Gmail/M365 mail, calendar & attachments

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   BMail▲93

   Encrypt emails and attachments

   2024 · chromewebstore.google.com · its alternatives →

2. 2
   Mailvelope▲61

   End-to-end email encryption for webmail

   2021 · mailvelope.com · its alternatives →

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

   Manage sales and customer relationships directly inside Gmail. Streak is the CRM your team will actually use—integrated, smart, and loved by 750,000+ users.

   2013 · streak.com · its alternatives →

4. 4
   ProtonMail▲199

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

   2016 · proton.me · its alternatives →

5. 5
   Sealit▲509

   Simple data security to get compliant & stay productive

   2023 · its alternatives →

6. 6
   Secure Swiss Data Encrypted Mobile App▲69

   Fully encrypted email app, hosted exclusively in Switzerland

   2017 · swissfinancestartups.com · its alternatives →

7. 7
   Hansel by Seedling▲106

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

   Aug 2026 · github.com · its alternatives →

8. 8
   Beeble▲314

   The safest platform to exchange emails and store files

   2024 · beeble.com · its alternatives →

9. 9
   WunderMail for Gmail▲145

   The missing native desktop client for Gmail on Windows 10.

   2018 · its alternatives →

10. 10
    Mailflow▲267

    Run your business from Gmail

    2020 · getmailflow.com · its alternatives →

11. 11
    I made a Chrome extension to clean up your Gmail inbox locally▲96

    Hi everyone, My motivation for building this was to address the trouble of mass unsubscribing from unwanted emails and deleting bulk emails while ensuring privacy and control over the process. With this Chrome extension, emails are not sent to any external servers. All calls to the Gmail API happen locally on your device. Feedback and suggestions are welcome!

    2024 · inboxpurge.com · its alternatives →

12. 12
    Misakey 1.0▲112

    Send encrypted documents & messages to anyone

    2020 · its alternatives →

13. 13
    Send/Share Files by Couchdrop▲135

    Send encrypted file links instead of email attachments

    Oct 2025 · couchdrop.io · its alternatives →

14. 14
    End to End Encryption File Sharing▲90

    Securely share sensitive files

    2022 · comply.strac.io · its alternatives →

15. 15
    AstraCrypt▲65

    Store your files in a secure encrypted container

    2022 · play.google.com · its alternatives →

16. 16
    Skiff Mail▲165

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

    2022 · skiff.com · its alternatives →

17. 17
    Easily send encrypted email from your existing email▲22

    Download Virtru Email Protection for Google Chrome and Microsoft Outlook to start sending encrypted emails and attachments.

    2014 · virtru.com · its alternatives →

18. 18
    Skizzle▲89

    End-to-end encrypted attachments in Gmail

    2021 · its alternatives →

19. 19
    ProtonMail▲82

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

    2014 · proton.me · its alternatives →

20. 20
    Secure Calendar▲75

    Privacy respecting calendar

    2019 · securecalendar.online · its alternatives →

21. 21
    Dark Mail▲62

    Truly Encrypted Email That Even Encrypts the Metadata

    2014 · its alternatives →

22. 22
    Jumble▲88

    E-mail encryption plugin for Chrome

    2014 · its alternatives →

23. 23
    OI Calendar▲78

    Encrypted, decentralized alternative to Google calendar

    2019 · cal.openintents.org · its alternatives →

24. 24
    Aster Mail▲1

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

    Apr 2026 · astermail.org · its alternatives →

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 →