Substack
CMS
Joomla
CMSSubstack vs Joomla
Substack and Joomla are both popular choices, but they serve different needs. Substack is a CMS with a traditional, manual approach to building, while Joomla is a CMS that prioritises developer or designer control.
Below you'll find a side-by-side breakdown of detection signals, AI scores, and technical fingerprints — plus our honest take on which builder wins for different use cases.
Side-by-Side Comparison
| | |
|---|---|---|
| Category | CMS | CMS |
| AI Score | 20/100 — Traditional | 20/100 — Traditional |
| Detection Signals | 5 patterns | 7 patterns |
| Script Detection | 2 patterns | 2 patterns |
| CDN Detection | 1 domains | — |
| Header Detection | — | 1 headers |
| Sites Detected | 4 scans | 140 scans |
| Best For | Blogs & content-heavy sitesTry Substack → | Blogs & content-heavy sitesTry Joomla → |
| Official Website | Visit | Visit |
Example Websites
Substack websites
Substack
CMS
Substack is a cms with an AI Score of 20/100 (Traditional). Our detection engine uses 5 signal patterns to identify Substack-built sites.
Joomla
CMS
Joomla is a cms with an AI Score of 20/100 (Traditional). Our detection engine uses 7 signal patterns to identify Joomla-built sites.
Platform Overviews
Substack
Substack is the largest and most influential newsletter and subscription platform, hosting hundreds of the world's top writers, journalists, and independent media outlets — including publications that have generated millions in annual subscriber revenue. It pioneered the paid newsletter model with simple 10% revenue sharing, a writer-friendly setup experience, and a built-in discovery network. Substack Recommendations has become a major growth channel, with reader suggestions driving new subscriber acquisition. Substack sites are identifiable through resources loaded from substackcdn.com for media and assets, the Substack JavaScript runtime on all publication pages, and distinctive *.substack.com subdomain patterns. Custom domain sites still load all media through substackcdn.com, making it a reliable detection signal. The platform is free to use with Substack taking 10% of paid subscription revenue.
Joomla
Joomla is a veteran open-source CMS that holds the second-largest market share among self-hosted CMS platforms after WordPress — powering millions of sites for small businesses, government agencies, and non-profits worldwide. Its flexible user access management (ACL) and multilingual support built into the core (no plugin required) make it popular for organizations with complex permission structures and international audiences. Joomla's extension directory has 8,000+ extensions for adding functionality. Joomla sites are identifiable through /media/jui/ paths for jQuery UI assets, com_content references in URL query strings (index.php?option=com_content), the Joomla generator meta tag containing the version number, and /administrator/ path for the backend. The Joomla JavaScript namespace and component-specific CSS classes (mod-articles-category, com_content) appear throughout the markup. Joomla is free and open-source.
Key Differences
- Both Substack and Joomla are classified as CMS tools, making them the most direct competitors in this comparison.
- Substack scores higher on AI involvement (20/100 vs 20/100 for Joomla), meaning it relies more heavily on AI for site generation and content creation.
- Our detection engine identifies Substack using 5 fingerprint patterns and Joomla using 7 patterns — more signals generally means more reliable detection.
Which Should You Choose?
Choose Substack if…
- You prefer a cms solution
- You want more manual control over the final output
- Substack's detection fingerprint of 5 signals means your site is reliably identifiable
Choose Joomla if…
- You need a cms approach
- You prefer traditional building tools with predictable output
- Joomla's ecosystem and community better match your team's existing workflow
Our Pick — Based on 144+ detections
Joomla
Detected 35× more often than Substack across our database of scanned sites.
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