Use
Try OCF on your own documents. Validation and rendering run in your browser — nothing is uploaded.
Playground
Paste or edit an OCF document and validate it instantly against the reference validator.
Renderer
See an OCF document drawn as a diagram, straight from the JSON.
Rulesets
The playing surfaces OCF supports, with their coordinate systems and markings.
Error codes
What each validation error and warning means, so you can fix a document quickly.