BlueMail alternatives · Email
Open-source alternatives to BlueMail
BlueMail is not described as open source on its own site. 39 of the 125 other email apps in this directory are open source, according to their own sites.
BlueMail has a free plan. Paid plans start at $35.99 per year (Plus, shown as $3 per month billed annually). 33 of them are free or have a free plan.
39 tools · Listings checked up to Nov 13, 2026 · Where the facts come from
The 12 closest to BlueMail
- Free
Thunderbird
Free, open-source email app for Windows, macOS, Linux and Android
- Thunderbird is free. BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only BlueMail lists an iOS app.
- Thunderbird is open source, according to its own site.
- BlueMail is end-to-end encrypted, according to its own site.
- Free plan · from $7.49 one-time
FairEmail
Open source, privacy-oriented email client for Android
- FairEmail starts at $7.49 one-time (pro features, US Google Play in-app purchase). BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only BlueMail lists iOS, macOS, Windows and Linux apps.
- FairEmail is open source, according to its own site.
- FairEmail can be bought with a one-time purchase.
- Free
K-9 Mail
Open source email client for Android, now moving to Thunderbird
- K-9 Mail is free. BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only BlueMail lists iOS, macOS, Windows and Linux apps.
- K-9 Mail is open source, according to its own site.
- BlueMail is end-to-end encrypted, according to its own site.
- Free plan
Wino Mail
Free, open source mail and calendar app for Windows
- Only BlueMail lists iOS, Android, macOS and Linux apps.
- Wino Mail is open source, according to its own site.
- BlueMail is end-to-end encrypted, according to its own site.
- Wino Mail also covers tasks.
- Free plan · from $3.99/mo
Proton Mail
End-to-end encrypted email service based in Switzerland
- Proton Mail starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only Proton Mail lists a web app.
- Proton Mail is open source, according to its own site.
- BlueMail also covers templates and inbox filtering.
- Free plan · from €3/mo
Tuta Mail
End-to-end encrypted email and calendar from Germany
- Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only Tuta Mail lists a web app.
- Tuta Mail is open source, according to its own site.
- BlueMail also covers templates and inbox filtering.
- From €1/mo
Posteo
Ad-free, green-powered email from Berlin for €1 a month
- Posteo starts at €1 per month, prepaid (minimum top-up €12). BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- BlueMail has a free plan. Posteo does not.
- Only Posteo lists a web app.
- Only BlueMail lists iOS, Android, macOS, Windows and Linux apps.
- Free trial · from $18/mo
Inbox Zero
Open source AI email assistant for Gmail and Outlook
- Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- BlueMail has a free plan. Inbox Zero does not, though it has a free trial.
- Only Inbox Zero lists a web app.
- Only Inbox Zero lists a browser extension.
- Free plan · from $20/mo
Zero Mail
Open-source AI email client that connects your existing inboxes
- Zero Mail starts at $20 per month (billing basis not shown). BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only Zero Mail lists a web app.
- Only BlueMail lists iOS, Android, macOS, Windows and Linux apps.
- Zero Mail is open source and self-hostable, according to its own site.
- Paid
Open-Xchange
OX App Suite email platform sold to providers and governments
- BlueMail has a free plan. Open-Xchange does not.
- Only Open-Xchange lists a web app.
- Only BlueMail lists iOS, Android, macOS, Windows and Linux apps.
- Open-Xchange is open source and self-hostable, according to its own site.
- Free plan · from $8/mo
Mailspring
Open-source desktop email client for Mac, Windows and Linux
- Mailspring starts at $8 per month, or $85 per year (Mailspring Pro). BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually).
- Only BlueMail lists iOS and Android apps.
- Mailspring is open source, according to its own site.
- BlueMail is end-to-end encrypted, according to its own site.
- Paid
Zimbra
Self-hosted email, calendar and file sharing for organizations
- BlueMail has a free plan. Zimbra does not.
- Only Zimbra lists a web app.
- Zimbra is open source and self-hostable, according to its own site.
- BlueMail is end-to-end encrypted, according to its own site.
Common questions
Is there an open-source alternative to BlueMail?
Yes. Thunderbird, FairEmail, K-9 Mail, Wino Mail, Proton Mail, Tuta Mail, Posteo, Inbox Zero and 31 more are open source, according to their own sites.
Is BlueMail open source?
BlueMail is not described as open source on its own site. The listing was checked on Oct 5, 2026 against the pages it cites.
Which of these email apps are free?
Thunderbird, FairEmail, K-9 Mail, Wino Mail, Proton Mail, Tuta Mail, Zero Mail, Mailspring and 25 more are free or have a free plan.
When was this checked?
Each listing shows its own date. On this page they run from Oct 4, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to BlueMail: the alternatives its listing names first, then the tools that share the most features with it.