Hey Product Hunt 👋 I built CosTrace after realizing how messy shared expenses get when they're not a one-time thing — splitting costs for kids with an ex-partner, managing a shared budget with a current partner, or just keeping things fair with roommates. These aren't weekend-trip expenses you settle once and forget. They're ongoing, for years, often with the same people whether the relationship changes or not. Here's the thing nobody talks about: expenses almost never balance out cleanly month to month. One month you pay the electricity bill, your partner covers internet — but the amounts aren't equal, so someone's owed a bit more. Next month it flips the other way. Multiply that over years and nobody actually knows who's ahead or behind anymore. CosTrace keeps the running total so you never have to guess. Every expense-splitting app I tried was built for the short term: add expense, settle up, done. None of them were built for the reality of tracking who owes what over years — especially in situations like co-parenting, where clarity and a fair paper trail actually matter. CosTrace tracks shared expenses long-term — multi-currency support, recurring costs, shared savings funds, and a full history that stays accurate whether you've been splitting costs for 3 months or 5 years. I'm a solo developer building this independently, so any feedback — good, bad, or "this is missing X" — genuinely helps. Happy to answer anything about the tech, the pricing, or what's coming next.

CosTrace

Shared expenses that last as long as your relationships

Shared expenses that last as long as your relationships