Isso
Isso: A self-hosted commenting system with Markdown, moderation, voting and comment imports. Ranked #14 of 18 in Commenting Systems by our editors (7.8/10); pricing: Free plan; best for small self-hosters seeking lightweight open-source comments.
At a glance
- Editor score7.8 / 10
- PricingFree plan
- Best forSmall self-hosters seeking lightweight open-source comments
- Free planYes
- Paid fromFree
- Moderation toolsBasic
- Founded2012
- Facts checked24 Sep 2026
Where it wins
- Embeddable JavaScript client supports website integration.
- Imports comments from Disqus and WordPress.
- Supports Markdown, voting and configurable comment editing or deletion.
Where it doesn't
- Moderation tools are basic.
- Integrations are limited to Disqus and WordPress.
- Self-hosting means managing the deployment yourself.
Our verdict on Isso
Isso is an open-source commenting server for website owners who want to host comments themselves, particularly solo operators and small teams. Written in Python and JavaScript, it embeds through a JavaScript client and supports anonymous comments, Markdown and threaded discussions. Comments are stored in SQLite, and the project has been around since 2012. Its scope is centered on providing a lightweight commenting layer rather than a broad publishing or community platform.
The feature set covers the core discussion workflow: users can edit or delete their own comments within a configurable time window, readers can like or dislike comments, and administrators get a moderation queue and interface. Email reply notifications are sent via SMTP. These tools provide practical control over comments, but moderation is basic; sites that need more extensive moderation or spam-management capabilities may prefer a more specialized system. Support is through community resources and documentation.
Migration and deployment are the main fit considerations. Administrators can import comments from Disqus or WordPress, while the JavaScript client can be integrated with websites, including static sites using cross-origin resource sharing. Isso is distributed as self-hosted open-source software, with no vendor-hosted plans described. That makes it a sensible choice for site owners comfortable managing their own deployment and looking for a focused, lightweight system. It is less suitable for teams seeking a managed service, broad integrations, or deeper moderation controls.
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Isso pricing
Isso fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Moderation tools | Basic |
| SSO support | Not verified |
| Spam filtering | Yes |
| Comment reactions | Yes |
| Email notifications | Yes |
| Site limit | Not verified |
| API access | Yes |
| Deployment | Self-hosted, Cloud |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Integrations | 2 integrations: Disqus, WordPress |
| Pricing | Free plan |
| Website | isso-comments.de |
| Facts checked | 24 Sep 2026 |
Isso integrations
Isso lists 2 integrations on its own site.
- Disqus
- WordPress
Alternatives to Isso
- DisqusA broad commenting platform with deep moderation, analytics and traffic-based plans.9.4
- CoralA publisher-focused commenting system with flexible deployment and detailed moderation controls.9.2
- CackleA feature-rich cloud commenting system for CMS sites that need active moderation.9.0
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Featured on iTechGuides
Isso is listed in our Commenting Systems directory. Add the badge to your site — it links back to this page.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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