Free tools
Face the math. Then fix the plan.
Free calculators and diagnostics for solo founders and side-project builders. No signup. No email gate. Just the numbers.
calculatorWhat Will This Actually Cost Me?Calculate the real cost of running your side project — including taxes, fees, and the stuff nobody warns you about. Find your break-even number.Try it free →calculatorIs My Price Right?Find out if your pricing actually works. Calculate how many customers you need, what conversion rate you're betting on, and whether the math adds up.Try it free →calculatorHow Long Until I Can Quit My Job?Find out how long it will realistically take your side project to replace your salary. Plug in your numbers. Face the math.Try it free →scorecardIs My Idea Already Taken?Found a competitor and panicking? Or convinced you're the only one? This scorecard helps you figure out what competition actually means for your idea.Try it free →quizAm I Doing Validation Theater?You think you've validated your idea. But have you really? This quiz checks your evidence — not your enthusiasm.Try it free →
Go deeper
Want to pressure test the whole idea, not just the numbers?
Cat the Arbiter runs your startup idea through six phases of brutally honest validation. You get a verdict, specific weaknesses, and a plan to fix them.