Shape model behavior.
A playground for people in UX to learn how to shape AI model behaviors. Learn by doing. Create artifacts you can use later.
Free in your browser — no key needed to start.
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.
Three steps to get going.
Start free.
A small open model runs right in your browser — no key required. Bring an Anthropic or OpenAI key when you want bigger models.
Shape something.
Open a playground. Tune a tone, design a persona, diff two prompts.
Save it to your notebook.
Every draft persists locally — reopen, duplicate, export as JSON.