Cusp documentation

Cusp is an open-source, single-tenant, editor-first CMS built natively on the Cloudflare Developer Platform. It runs as one Worker against one D1 database, one R2 bucket, and one KV namespace — with real-time multi-editor collaboration, complete versioning of every entity, hot-installable themes and plugins, and one-click site-wide time travel.

The name: a cusp is a point of transition — the pointed edge where one curve meets another, the threshold between one state and the next. Cusp runs on Cloudflare's edge and sits at the cusp between what you write and what the world reads.

Click Deploy, sign in to Cloudflare, fill in a short form, and you'll land in a first-run setup wizard at your own *.workers.dev URL — no terminal, no wrangler commands, no config files to edit.

Start here

• Guides — deploy Cusp, use the editor, publish, version, and time-travel your content.
• Reference — the headless API, bindings, and configuration.
• Extending — author themes and plugins.
• Architecture — how Cusp is built on the Cloudflare platform.
• Decisions — the architecture decision records.