Isso vs Cusdis
A side-by-side comparison of two self-hosted chat & communication options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Isso | Cusdis |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 87 · Excellent | 15 · At risk |
| Status | Actively maintained | Archived |
| Category | Chat & Communication | Chat & Communication |
| License | MIT | GPL-3.0 |
| Language | Python | TypeScript |
| Setup difficulty | Easy | Easy |
| Min. RAM | 128 MB | 256 MB |
| Deployment | docker, bare-metal, source | docker, source |
| GitHub stars | ★ 5,309 | ★ 2,780 |
| First released | 2012 | 2021 |
| Replaces | Disqus | Disqus |
What are Isso and Cusdis?
Isso
Isso is a small, self-hosted commenting server written in Python that serves as a Disqus alternative for blogs. It uses SQLite and embeds a tiny JavaScript widget into pages.
- Tiny embeddable comments widget
- SQLite storage
- Comment editing and moderation
- Markdown support
Cusdis
Cusdis is an open-source, lightweight alternative to Disqus that embeds a tiny comment widget into websites. It is privacy-focused, with no tracking and a small footprint.
- Tiny embeddable widget
- Privacy-friendly, no tracking
- Email and webhook notifications
- Moderation dashboard
Isso vs Cusdis: key differences
The biggest difference is maintenance: Cusdis's repository is archived and no longer developed, while Isso is actively maintained. Isso is written in Python, while Cusdis is built with TypeScript. Licensing differs — MIT for Isso versus GPL-3.0 for Cusdis. Isso is the lighter option, starting around 128 MB of RAM against 256 MB for Cusdis. Isso is the more established project (first released 2012), while Cusdis arrived in 2021.
Why pick each one
Choose Isso if…
- Very lightweight
- Easy to integrate with static sites
Watch out for
- Comments only
- Minimal anti-spam built in
Choose Cusdis if…
- Released under the GPL-3.0 license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Active community (2.8k GitHub stars)
Watch out for
- Comments only
- Smaller feature set
Frequently asked questions
Is Isso or Cusdis better?
Neither is universally better. Isso has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are Isso and Cusdis free and open-source?
Yes. Isso is licensed under MIT and Cusdis under GPL-3.0. Both can be self-hosted at no software cost.
Can I run Isso and Cusdis with Docker?
Isso: yes. Cusdis: yes.
Which is lighter on resources, Isso or Cusdis?
Isso has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for Cusdis. Real-world usage depends on library size, user count, and enabled features.