Zoho Mail alternatives · Email
Open-source alternatives to Zoho Mail
Zoho Mail is not described as open source on its own site. 16 of the 73 other email apps in this directory are open source, according to their own sites.
Zoho Mail has a free plan. Paid plans start at $1 per user / month, billed annually (Mail Lite, 5 GB). 13 of them are free or have a free plan.
16 tools · Listings checked up to Nov 12, 2026 · Where the facts come from
The 12 closest to Zoho Mail
- 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. Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Proton Mail is open source and end-to-end encrypted, according to its own site.
- Zoho Mail also covers tasks.
- Free plan
Wino Mail
Free, open source mail and calendar app for Windows
- Only Zoho Mail lists a web app.
- Only Zoho Mail lists macOS, Linux, iOS and Android apps.
- Wino Mail is open source, according to its own site.
- Wino Mail also covers templates.
- Free
Thunderbird
Free, open-source email app for Windows, macOS, Linux and Android
- Thunderbird is free. Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Only Zoho Mail lists a web app.
- Only Zoho Mail lists an iOS app.
- Thunderbird is open source, according to its own site.
- 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). Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Tuta Mail is open source and end-to-end encrypted, according to its own site.
- Zoho Mail also covers tasks.
- Paid
Zimbra
Self-hosted email, calendar and file sharing for organizations
- Zoho Mail has a free plan. Zimbra does not.
- Zimbra is open source and self-hostable, according to its own site.
- 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). Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Zoho Mail has a free plan. Posteo does not.
- Only Zoho Mail lists macOS, Windows, Linux, iOS and Android apps.
- Posteo is open source and 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). Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Only Zoho Mail lists a web app.
- Only Zoho Mail lists macOS, Windows, Linux and iOS apps.
- FairEmail is open source and end-to-end encrypted, according to its own site.
- 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). Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Zoho Mail has a free plan. Inbox Zero does not, though it has a free trial.
- Only Inbox Zero lists a browser extension.
- Only Zoho Mail lists a Linux app.
- 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). Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Only Zoho Mail lists macOS, Windows, Linux, iOS and Android apps.
- Zero Mail is open source and self-hostable, according to its own site.
- Zero Mail also covers inbox filtering.
- Free
Evolution
GNOME's free mail, calendar and address book app
- Evolution is free. Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Only Zoho Mail lists a web app.
- Only Zoho Mail lists macOS, Windows, iOS and Android apps.
- Evolution is open source, according to its own site.
- Free
Betterbird
A fork of Thunderbird with extra features and bug fixes
- Betterbird is free. Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Only Zoho Mail lists a web app.
- Only Zoho Mail lists iOS and Android apps.
- Betterbird is open source, 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). Zoho Mail starts at $1 per user / month, billed annually (Mail Lite, 5 GB).
- Only Zoho Mail lists a web app.
- Only Zoho Mail lists iOS and Android apps.
- Mailspring is open source, according to its own site.
Common questions
Is there an open-source alternative to Zoho Mail?
Yes. Proton Mail, Wino Mail, Thunderbird, Tuta Mail, Zimbra, Posteo, FairEmail, Inbox Zero and 8 more are open source, according to their own sites.
Is Zoho Mail open source?
Zoho Mail 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?
Proton Mail, Wino Mail, Thunderbird, Tuta Mail, FairEmail, Zero Mail, Evolution, Betterbird and 5 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 12, 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 Zoho Mail: the alternatives its listing names first, then the tools that share the most features with it.