Kostly is a transparent cost tracking tool for builders. Easily manage your tooling subscriptions across projects and share your cost breakdowns openly.

I created Kostly to solve a personal constraint. I challenged myself to ship a project each month for €100 max, but tracking tooling costs across multiple projects in Excel was painful. I needed to split costs fairly one tool, two projects, split the expense. But it's more than accounting. I believe in intentionality and hands-off moments. I wanted a system that proactively alerts me before renewals so I can ask: do I actually need this? And since people are always curious about the tools I use, I built in the ability to share my stack openly. Transparency as a feature. With vibe coding, I realised this was the perfect challenge: build a micro-app, solve a real problem, and get hands-on with AI.

OpenPage for the Kostly Project: https://ezli.me/7zg8bq