Hosting finished documentation for many projects at once, Docat leaves every uploaded version online for the readers still on version 2. Zip the static HTML that MkDocs, Sphinx, or mdBook produced. Send it to a project and version with curl or the docatl command line client. Tag the newest build as latest, and links get a stable address. Readers land on a home page that opens on starred favourites. A search box narrows the list, and its queries can be shared as links. Instance statistics report documents, versions, and storage. Inside any docs page, a version dropdown with a latest label moves between releases. Uploads are open at first. Claim a project and it returns a token that must accompany every later version upload or deletion. The same token hides versions from the dropdown and from search, and each project can carry its own icon. Operators can mount a small config file for custom header and footer HTML, raise the 100 MB default archive limit with an environment variable, and put nginx basic authentication in front of the write endpoints. Swagger UI and ReDoc pages at /api/docs and /api/redoc document the HTTP API for pipeline authors. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.