Why Do Developers Host Documentation on a Separate Subdomain?

Separating the documentation means you can have different teams working on it without interfering with main app developments. Since it’s usually its own environment, you won't have to worry about your documentation being tightly coupled with your app, which can cause headaches during updates.

Keeping docs separate allows for a different deployment cycle. This way, updates to the documentation can happen without needing to deploy the entire app, and it simplifies versioning since each version can have its own subdomain, like docs.domain.com/v1.

Hosting documentation on a subdomain helps with performance and caching. Static content like docs can be served quickly from CDNs without impacting the main app's performance, which might rely on dynamic content. It also reduces risk; if the docs go down, it won’t affect the main application.

Docs are often built with different frameworks like Docusaurus or Astro, which could complicate integration with the main site. By hosting them separately, you avoid potential issues that come with combining different tech stacks, making it easier to maintain and update them independently.

From what I’ve seen, it's just simpler to manage. Documentation can be updated and tested more frequently without risking the main app. Plus, many developers prefer using specialized tools for documentation, which naturally leads to hosting them separately.