CairnSign in

Free local beta

Start with the work
you already have.

Cairn attaches beneath Codex or Claude Code, records the economics, and gives you a receipt when the work is verified.

Local by defaultCodex + ClaudeNo credit card

Apply

Tell us what you’re building.

We’ll send the install path and a short first-run checklist. This is a free beta for people actively shipping with AI coding tools.

Already have access? Sign in to Cairn.

We’ll only use this to onboard the beta. No automated sales sequence.

What happens next

  1. 01Get the install path

    Choose Codex or Claude Code and attach Cairn locally.

  2. 02Run one real task

    Keep working normally while Cairn observes the boundary.

  3. 03Send us the friction

    Tell us what the receipt clarified—or what it missed.