Alone, they agree with you. Set against each other, they can't.
Each one is right some of the time, and sure of itself all of the time.
Send your grant application, tender, loan request or pitch. The Devil sets AIs from two rival labs against it and against each other, checks the rates, thresholds and rules against official sources, and tells you what to fix first.
Private beta, a few people at a time. Join, and we'll email you how to send your document. Your first ruling is free, and it comes back by email.
Chatbots are built to be agreeable.
Ask one whether your loan application is ready and it may well say yes. Each has its own sources and methods, so on its own it sounds confident. Ask again a different way and it can agree with that too.
Then the person you sent it to finds the problem you didn't. And they won't tell you what it was.
"Our payroll is under the Original: $1.2 million Corrected: $1 million payroll tax threshold, so no payroll tax applies."
From our test loan application. Checked 25 Oct 2026.
Five devils. All working for you.
AIs from two rival labs, each with one job, set against your document and against each other. The Devil chairs, and rules.
The Devil Chair
Sets the tests your document has to survive, then makes the ruling.
Runs on ClaudeLedger Numbers
Adds up the table you didn't think anyone would add up.
Runs on ClaudeClause Facts
Checks rates, thresholds and rules against official sources, with the link.
Runs on GPT with live searchHindsight Risks
Finds the assumption nobody wrote down.
Runs on ClaudeContrarian Argues back
From the rival lab, and its job is to disagree with the others.
Runs on GPTDevil's Council runs on Claude, from Anthropic, and GPT, from OpenAI, through their business APIs.
A loan application, the night before it goes out.
A test application we wrote for a cafe asking its bank for A$180,000, with mistakes planted in it. The Devil found eight problems in 68 seconds, including three facts that were wrong or out of date.
One run on 25 Oct 2026; an excerpt, lightly trimmed. Test document only, never a client's.
"$96,000 a year plus outgoings, which works out to Original: $6,000 Corrected: $8,000 a month"
$2,000 a month missing from the rent. Upheld by the Contrarian.
Our note: the ruling said this understates the rent "by a third". It is a quarter. The Devil gets things wrong too, which is why a person checks every ruling and you make the call.
"plus superannuation at Original: 11.5% Corrected: 12%"
"our combined Victorian payroll will stay under the Original: $1.2 million Corrected: $1 million payroll tax threshold"
Opinions are cheap. Sources aren't.
The Devil can still miss things, and so can the person checking it. It finds weak points; you make the call.
Run it past the Devil before you send a grant application, tender response, loan application, investor pitch or update, client proposal, business case, board paper, or the email that matters.
Pay per ruling. No subscription.
Your first ruling is free. After that, pay only when you have something going out.
3 rulings
Three different documents, or one application with its budget and cover letter.
Start with a free ruling10 rulings
For advisers and bookkeepers: use them on clients' documents, with your clients' consent.
Start with a free ruling- Every ruling comes with the live fact-check and the full case file.
- Fixed it? Send the revised version within 7 days and the Devil re-checks it free.
- Credits don't expire while Devil's Council runs. Not happy with a paid ruling? Email within 7 days for a refund.
- One ruling is one document up to 10,000 words. Nothing to pay now: during the beta, rulings come back by email, and you pay by a secure Stripe link only after your free one. The council takes about a minute; a person checks each ruling before it's sent.
Prices in Australian dollars. Already on the waitlist? Your 3 free rulings stand.
Take a seat at the council.
This joins the beta waitlist. We're letting people in a few at a time: leave your email and what you'd send the Devil first, and we'll email you how to send it. Your first ruling is free, and it comes back by email.
You're on the list.
We'll email you how to send your first document. Your first ruling is free.
That didn't go through.
Check the email address and try again. If it still fails, the problem is on our side; try again later.