Tools
Calculators for the arithmetic behind decisions people usually make on instinct, and a generator for the one file everyone asks about. Each shows its working, links to the article that argues the method, and is willing to tell you not to build the thing. No sign-up, and nothing you type leaves your browser.
Automation payback
Hours returned, annual value and payback in months - checked at a conservative automation rate as well as your own.
Open the calculator How many test cases do we actually need?Eval set size
Margin of error at 95% confidence, sized from per-category counts, and the point where more cases stop buying precision.
Open the calculator Where should the confidence gate sit?Escalation threshold
Compare two gate settings on your own measured numbers: deflection, errors reaching customers, and total weekly cost.
Open the calculator What will this actually cost per month?LLM cost
Monthly spend broken down by input, output, retries and evaluation runs - with cost per resolved task, not per call.
Open the calculator Which automation platform is cheapest for my workload?Zapier vs Make vs n8n
Same workflow, three billing models. Counts tasks, operations and executions separately, and includes what self-hosting really costs.
Open the calculator What should our llms.txt contain?llms.txt generator
A spec-correct llms.txt from a name, a summary and the pages that matter, with the lines that would break it flagged.
Open the generatorEverything runs in the page. Your figures are held in the address bar so a result has its own link you can send to somebody, and they are not transmitted, stored or logged.
Let's talk
Numbers point one way, the decision another?
That is usually a sign the question is scoped wrong rather than calculated wrong. The first conversation is about whether the thing is worth building at all.