Software Alternatives, Accelerators & Startups

ProtonMail Extension

Unofficial webextension for ProtonMail.

Best ProtonMail Extension Alternatives & Competitors in 2025

The best ProtonMail Extension alternatives based on verified products, community votes, reviews and other factors.
Latest update:

  1. Unofficial desktop app for ProtonMail and Tutanota end-to-end encrypted email providers

    /electronmail-alternatives
  2. Mailvelope open source project. OpenPGP in your browser.

    /mailvelope-alternatives
  3. The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

    Visit website paid $19.5 / Monthly (Pro)

    Visit website
  4. Android Privacy Guard (APG) is a free and open source application for ...

    /apg-alternatives
  5. Secure email with absolutely no compromises. Get your free encrypted email account today.

    freemium €5.0 / Monthly (user - 5 GB)

    /protonmail-alternatives
  6. GPGMail is an open source plugin for Apple Mail.

    /gpgmail-alternatives
  7. Security extension to Mozilla Thunderbird and SeaMonkey

    /enigmail-alternatives
  8. Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

    /thunderbird-alternatives
  9. Get your encrypted mailbox for free.

    Open Source

    /tutanota-alternatives
  10. Multi-Account Zoho client for Mac.

    /mailbox-for-zoho-alternatives
  11. Zoho Mail is a secure, encrypted, and enterprise-ready email solution, a suite of apps tailor-made for your organization's needs.

    freemium $1.0 / Monthly (per user)

    /zoho-mail-alternatives
  12. Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

    /gmail-alternatives
  13. Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

    /microsoft-outlook-alternatives
  14. Convenient End-to-End Encryption for E-Mail

    /autocrypt-alternatives
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