Free tools to plan your app.

"How much does it cost to build an app?" is the first question every business owner asks — and the answers online are all over the map, from $10,000 to $250,000. The honest answer is: it depends on features, screens, and who builds it.

Before you build, it helps to see the upside. This calculator turns two simple numbers — your price per customer and how many customers you have — into monthly (MRR) and yearly (ARR) revenue, so you can pressure-test whether the idea is worth pursuing.

Hiring a developer or agency means a big quote, weeks or months of waiting, and needing them again for every change. Building it yourself with AI means it's live today, free, and you can change it any time — but you do it yourself.