Posteo alternatives · Email
Posteo alternatives with a Windows app
The Posteo listing does not include a Windows app. 30 of the 73 other email apps in this directory list a Windows app.
Posteo is a paid product, starting at €1 per month, prepaid (minimum top-up €12). 19 of them are free or have a free plan.
30 tools · Listings checked up to Nov 12, 2026 · Where the facts come from
The 12 closest to Posteo
- 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). Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Tuta Mail has a free plan. Posteo does not.
- Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
- Posteo also covers notes.
- 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. Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Proton Mail has a free plan. Posteo does not.
- Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
- Posteo also covers notes.
- Free
Thunderbird
Free, open-source email app for Windows, macOS, Linux and Android
- Thunderbird is free. Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Thunderbird has a free plan. Posteo does not.
- Only Thunderbird lists Windows, macOS, Linux and Android apps.
- Only Posteo lists a web app.
- Free plan · from $36/yr
Canary Mail
AI email client with PGP encryption for Mac, iOS, Windows, Android
- Canary Mail starts at $36 per year (Growth), shown as $3 per month billed yearly. Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Canary Mail has a free plan. Posteo does not.
- Only Canary Mail lists macOS, iOS, Windows and Android apps.
- Only Posteo lists a web app.
- Free plan · from $49.95/yr
eM Client
Desktop email client for Windows and Mac with calendar and chat
- eM Client starts at $49.95 per year (Personal subscription, up to 3 devices). Posteo starts at €1 per month, prepaid (minimum top-up €12).
- eM Client has a free plan. Posteo does not.
- Only eM Client lists Windows, macOS, iOS and Android apps.
- Only Posteo lists a web app.
- Free plan · from $35.99/yr
BlueMail
Cross-platform email client with a unified inbox and built-in AI
- BlueMail starts at $35.99 per year (Plus, shown as $3 per month billed annually). Posteo starts at €1 per month, prepaid (minimum top-up €12).
- BlueMail has a free plan. Posteo does not.
- Only BlueMail lists iOS, Android, macOS, Windows and Linux apps.
- Only Posteo lists a web app.
- Free plan
Wino Mail
Free, open source mail and calendar app for Windows
- Wino Mail has a free plan. Posteo does not.
- Only Wino Mail lists a Windows app.
- Only Posteo lists a web app.
- Posteo is end-to-end encrypted, according to its own site.
- Paid
Zimbra
Self-hosted email, calendar and file sharing for organizations
- Only Zimbra lists Windows, macOS, Linux, iOS and Android apps.
- Zimbra is self-hostable, according to its own site.
- Posteo is end-to-end encrypted, according to its own site.
- Zimbra also covers tasks.
- Free
Betterbird
A fork of Thunderbird with extra features and bug fixes
- Betterbird is free. Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Betterbird has a free plan. Posteo does not.
- Only Betterbird lists Windows, macOS and Linux apps.
- Only Posteo lists a web app.
- From $25/mo
Superhuman Mail
Keyboard-driven email client for Gmail and Outlook with built-in AI
- Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly). Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Only Superhuman Mail lists macOS, Windows, iOS and Android apps.
- Only Superhuman Mail lists a browser extension.
- Posteo is open source and end-to-end encrypted, according to its own site.
- Free plan · from $8.25/mo
Spark Mail
Email client with a unified smart inbox, AI tools and team features
- Spark Mail starts at $8.25 per user / month, billed annually ($99 / year). Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Spark Mail has a free plan. Posteo does not.
- Only Spark Mail lists macOS, Windows, iOS and Android apps.
- Only Posteo lists a web app.
- Free trial · from $99/yr
HEY
Email service and calendar with sender screening, from 37signals
- HEY starts at $99 per year (HEY for You, annual billing only). Posteo starts at €1 per month, prepaid (minimum top-up €12).
- Only HEY lists macOS, Windows, Linux, iOS and Android apps.
- Posteo is open source and end-to-end encrypted, according to its own site.
- HEY also covers templates.
Common questions
Which Posteo alternatives have a Windows app?
Tuta Mail, Proton Mail, Thunderbird, Canary Mail, eM Client, BlueMail, Wino Mail, Zimbra and 22 more list a Windows app.
Does Posteo have a Windows app?
The Posteo listing does not include a Windows app. It lists Web.
Which of these email apps are free?
Tuta Mail, Proton Mail, Thunderbird, Canary Mail, eM Client, BlueMail, Wino Mail, Betterbird and 11 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 Posteo: the alternatives its listing names first, then the tools that share the most features with it.