Shape model behavior.
A hands-on playground for UX designers and researchers to learn a new craft: designing how an AI behaves — its tone, persona, and boundaries. It's not about using AI to do your work; it's about learning to direct the model itself.
Free in your browser — no key needed to start.
Three steps to get going.
Start free.
A small open model runs right in your browser — no key required. Bring an Anthropic, OpenAI, or Google key when you want bigger models.
Design a behavior.
Pick one lever in a playground — a tone, a persona, a boundary — change it, and watch how the model's output shifts.
Save it to your notebook.
Every draft persists locally — reopen, duplicate, export as JSON.
You already think like a behavior designer.
The skills you use every day are the foundation of shaping AI. This site helps you make the connections and try it out.
Play and learn.
Diff mode
One prompt, two configs, side by side. Feel how prompts shape outputs.
Tone dial
Style as a design token. Move dials, watch the prompt rewrite itself.
Persona workshop
Character design for AI. Build a backstory, voice, and blind spots.