Works where you already work
One skill, one runtime, and the same two words in whichever AI you have open. Supported means every one of four tests is green; in testing means it installs and runs while one is still being measured.
Also through Spec Kit, as the keel extension — the same skill, on whichever of the AIs above your project uses; the install line is under Get started.
How it works
From a hunch to a brief
You board unsure.
1
Keel frames it.
Problem, solution and price go from vague to a sentence with a number in it. Keel nudges until each has one.
2
Keel breaks it down.
Each sentence becomes lines that can be measured, with the question that measures each, and which ones are deal-breakers.
3
Keel builds the interview.
One short page per person, about one real occasion, never your number. You read it once, approve, and send the links yourself.
4
They answer.
The people you invite open the link and answer in a few minutes.
5
Keel reads the answers.
Your own AI reads what came back on your machine, shows the guessers hollow and never counts them, and updates each line.
6
Keel tells you where you landed.
Each card comes back holding up, not holding up, or split, with the drift — and Keel writes the brief for whoever builds it.
You dock knowing where your numbers landed.
Ten minutes, once
Fit the keel to your own ship.
Connect Claude Code, Copilot or Codex on your own machine. Nothing you learn is locked into a model of ours.
A bare hull.
1
Your AI.
Claude Code, GitHub Copilot or Codex on your machine.
2
Fetch the keel.
Two commands from the marketplace.
3
Say “keel connect”.
The runtime starts on your machine and prints a code.
4
Sign in with Google.
Approve the device on the page it opens.
5
Linked.
A line now runs between your AI and Keel; every reading travels down it and back. Keel keeps your project, the lines, the answers and the record.
6
Your machine does the thinking.
Your AI does the thinking, on your own account. Keel picks the model for each step — a small, fast one for the readings — and never calls an AI itself. It is free for a single founder.
Under way, on your own engine.
Keel is in beta. Claude Code, Copilot and Codex today. Spec Kit when it is published.
Is Keel for you?
For you if
- You have an idea, and five to twelve people who would know.
- You use Claude Code, Copilot or Codex.
- You would rather find out now than in six months.
Not for you if
- You want a survey tool.
- You want a market-size number.
- You want to be told you are ready.
Keel will never
- Score you, rate you, or congratulate you.
- Email anyone on your behalf.
- Change a line once someone has been asked about it.
- Call anything until five people have described a real case.