head to head · open source
Zammad vs Cossistant
Zammad has 6,067 GitHub stars, 1,093 forks, 451 open issues and last shipped yesterday. Cossistant has 738 stars, 51 forks, 4 open issues and last shipped 2 months ago. Zammad leads on adoption by 722% (6,067 vs 738 stars). Zammad is written in Ruby under AGPL-3.0; Cossistant is written in TypeScript under AGPL-3.0. Zammad has attracted 18% as many forks as stars, Cossistant 7%. Zammad was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (support), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Zammad | Cossistant | |
|---|---|---|
| GitHub stars | ★ 6.1K | ★ 738 |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | Ruby | TypeScript |
| Last push | 2026-11-02 | 2026-09-18 |
| Forks | ⑂ 1.1K | ⑂ 51 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Zammad if
- You weight community size — 6.1K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Ruby
- You value the larger contributor base for long-term maintenance
pick Cossistant if
- You want the Cossistant feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and Cossistant fits your workflow better
About Zammad
Welcome to Zammad Are you juggling countless customer inquiries across multiple channels? Struggling to keep your support team on the same page? Or spending more time managing your helpdesk than delivering exceptional support to your customers? Zammad is your Swiss Army knife a web based, open source helpdesk and customer support platform packed with features to streamline customer communication across channels like email, chat, telephone and social media. The Software The Zammad software is and will stay open source. It is licensed under the GNU AGPLv3. The source code is available on GitHub and owned by the…
read the full Zammad overview →
About Cossistant
Open source chat <Support / widget for React Issues · Docs · Discord About Cossistant Cossistant is an open source chat support widget for the React ecosystem. Built by developers, for developers who need a flexible, customizable chat solution that seamlessly integrates into their applications. We provide headless components, real time messaging, and complete backend infrastructure—all with a code first, API driven philosophy that prioritizes developer experience and AI friendly documentation. Get Started Using Cossistant in your app? → Check out our Quickstart Guide Contributing to Cossistant? → Read the…
read the full Cossistant overview →
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Frequently asked questions
Is Zammad or Cossistant more popular?
Zammad has 6,067 GitHub stars and Cossistant has 738. Zammad has the larger community by that measure.
Are Zammad and Cossistant free?
Both are open source. Zammad is licensed under AGPL-3.0 and Cossistant under AGPL-3.0. Neither carries a licence fee.
What is the difference between Zammad and Cossistant?
Zammad is written in Ruby and Cossistant in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Zammad or Cossistant?
Choose Zammad if you want the larger community (6,067 stars) or its AGPL-3.0 licence terms. Choose Cossistant if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.