Open-Xchange alternatives · Email
Free alternatives to Open-Xchange
Open-Xchange has no free plan. 82 of the 125 other email apps in this directory are free or have a free plan.
Open-Xchange's current pricing could not be confirmed from its own site. 30 of them have no paid plan at all; the rest pair a free plan with paid ones.
82 tools · Listings checked up to Nov 13, 2026 · Where the facts come from
The 12 closest to Open-Xchange
- Free
SOGo
Open-source groupware with webmail, calendars and contacts
What is free: Everything. There is no paid plan.
- SOGo has a free plan. Open-Xchange does not.
- Free plan · from $49 one-time
Afterlogic WebMail
Webmail front end for an existing IMAP mail server
What is free: WebMail Lite PHP is free and open source under AGPL-3.0 on GitHub; WebMail Pro adds the paid features.
- Afterlogic WebMail has a free plan. Open-Xchange does not.
- Free plan
Wino Mail
Free, open source mail and calendar app for Windows
What is free: Wino Mail is always free with no Wino Account needed: Mail, Calendar, Contacts and To Do, all core customization options and up to 3 email accounts.
- Wino Mail has a free plan. Open-Xchange does not.
- Only Wino Mail lists a Windows app.
- Only Open-Xchange lists a web app.
- Open-Xchange is self-hostable, according to its own site.
- Free plan · from $20/mo
Zero Mail
Open-source AI email client that connects your existing inboxes
What is free: One email connection, AI chat with your inbox, basic labeling and limited AI email writing.
- Zero Mail has a free plan. Open-Xchange does not.
- Zero Mail also covers inbox filtering.
- Open-Xchange also covers calendar.
- Free
Horde
Free open-source webmail, calendar, contacts and tasks suite
What is free: Everything. There is no paid plan.
- Horde has a free plan. Open-Xchange does not.
- Horde also covers notes and tasks.
- Free
mailcow
Dockerized open-source mail server with a web admin UI
What is free: Everything. There is no paid plan.
- mailcow has a free plan. Open-Xchange does not.
- Free
Mail-in-a-Box
Free script that turns a cloud server into your own mail server
What is free: Everything. There is no paid plan.
- Mail-in-a-Box has a free plan. Open-Xchange does not.
- Free plan · from $2.40/yr
Stalwart Mail Server
Open-source mail and collaboration server written in Rust
What is free: Community edition: the full mail server under AGPL-3.0, free to run on your own infrastructure.
- Stalwart Mail Server has a free plan. Open-Xchange does not.
- Stalwart Mail Server also covers file sharing and dMARC.
- Free
Modoboa
Open-source mail server with a web admin panel and webmail
What is free: Everything. There is no paid plan.
- Modoboa has a free plan. Open-Xchange does not.
- Free plan · from $499/yr
iRedMail
Open-source mail server installer for Linux and BSD
What is free: iRedMail itself is free and open source, with a free basic web admin panel.
- iRedMail has a free plan. Open-Xchange does not.
- Only iRedMail lists a Linux app.
- Only Open-Xchange lists a web app.
- Free plan · from $8.25/mo
Spark Mail
Email client with a unified smart inbox, AI tools and team features
What is free: Unlimited email accounts in a unified Smart Inbox with snooze, send later, reminders and calendar, plus 5 AI meeting notes in total and an AI Assistant preview limited to 1 month of email history.
- Spark Mail has a free plan. Open-Xchange does not.
- Only Spark Mail lists macOS, Windows, iOS and Android apps.
- Only Open-Xchange lists a web app.
- Open-Xchange is open source and self-hostable, according to its own site.
- Free plan · from $3.99/mo
Proton Mail
End-to-end encrypted email service based in Switzerland
What is free: Proton Free: 1 email address, up to 1 GB of mail storage (500 MB until the setup steps are completed), a limit of 150 sent messages a day and 3 personal calendars.
- Proton Mail has a free plan. Open-Xchange does not.
- Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
- Proton Mail is end-to-end encrypted, according to its own site.
- Open-Xchange is self-hostable, according to its own site.
70 more that are free or have a free plan
- Microsoft Outlook
- Thunderbird
- Zoho Mail
- Tuta Mail
- Canary Mail
- Spike
- eM Client
- BlueMail
- Newton Mail
- Roundcube
- Evolution
- Betterbird
- Yandex Mail
- Mailu
- SnappyMail
- Cypht
- Axigen
- SmarterMail
- Shortwave
- Gmail
- Apple Mail
- Yahoo Mail
- Mailbird
- Airmail
- Edison Mail
- Mailspring
- Mailfence
- FairEmail
- Extra
- Mailo
- SimpleLogin
- addy.io
- GMX Mail
- Claws Mail
- Mail.com
- WEB.DE
- K-9 Mail
- NeoMutt
- aerc
- Sylpheed
- Mutt
- CTemplar
- Twobird
- Foxmail
- docker-mailserver
- hMailServer
- AtomicMail
- MailMaestro
- Help Scout
- Fyxer
- Boomerang
- Mailbutler
- Marco
- Mailmeteor
- FlowCrypt
- AOL Mail
- Aqua Mail
- Right Inbox
- Riseup
- Guerrilla Mail
- Compose AI
- Temp Mail
- Clean Email
- Unroll.Me
- Cleanfox
- ImprovMX
- Firefox Relay
- Mailinator
- Maildrop
- Mailbrew
Common questions
Is there a free alternative to Open-Xchange?
Yes. SOGo, Afterlogic WebMail, Wino Mail, Zero Mail, Horde, mailcow, Mail-in-a-Box, Stalwart Mail Server and 74 more are free or have a free plan.
Does Open-Xchange have a free plan?
Open-Xchange has no free plan. Open-Xchange's current pricing could not be confirmed from its own site.
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 Open-Xchange: the alternatives its listing names first, then the tools that share the most features with it.