Cactus Comments vs Isso
A side-by-side comparison of two self-hosted chat & communication options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Cactus Comments | Isso |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Category | Chat & Communication | Chat & Communication |
| License | MIT | MIT |
| Language | Elixir | Python |
| Setup difficulty | Medium | Easy |
| Min. RAM | 256 MB | 128 MB |
| Deployment | docker, source | docker, bare-metal, source |
| GitHub stars | ★ 200 | ★ 5,309 |
| First released | 2020 | 2012 |
| Replaces | Disqus | Disqus |
What are Cactus Comments and Isso?
Cactus Comments
Cactus Comments is a privacy-friendly commenting system that uses Matrix rooms to store and federate comments on static websites. It is embeddable with a small script and works with any homeserver.
- Comments backed by Matrix
- Federated discussion
- Embeddable on static sites
- Privacy friendly
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
Cactus Comments vs Isso: key differences
Cactus Comments is written in Elixir, while Isso is built with Python. Isso is the lighter option, starting around 128 MB of RAM against 256 MB for Cactus Comments. Isso is the more established project (first released 2012), while Cactus Comments arrived in 2020. Isso has the considerably larger community, at 5,309 GitHub stars versus 200.
Why pick each one
Choose Cactus Comments if…
- Released under the MIT license
- First-class Docker support for quick deployment
- Written in Elixir
- Tiny footprint — runs in 256 MB RAM
Choose Isso if…
- Very lightweight
- Easy to integrate with static sites
Watch out for
- Comments only
- Minimal anti-spam built in
Frequently asked questions
Is Cactus Comments or Isso better?
Isso is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Cactus Comments if its specific feature set fits your needs better.
Are Cactus Comments and Isso free and open-source?
Yes. Cactus Comments is licensed under MIT and Isso under MIT. Both can be self-hosted at no software cost.
Can I run Cactus Comments and Isso with Docker?
Cactus Comments: yes. Isso: yes.
Which is lighter on resources, Cactus Comments or Isso?
Isso has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for Cactus Comments. Real-world usage depends on library size, user count, and enabled features.