Solving the "Wait, who paid for groceries?" problem

Hey PH!

My girlfriend and I constantly had the exact same conversation: "Wait, who paid for groceries yesterday?" or "Did I send you my half for the dinner?"

I got tired of it and built a solution. I'm a solo Java dev, so I built a native Telegram Mini App called Kopilo (launching soon!).

The feature I spent the most time on is "Shared Spaces." You add a partner or a roommate directly via a Telegram invite, set permissions, and all joint transactions and debts are calculated automatically in real-time via WebSockets. No more awkward math, no more separate apps to download.

Since it's in Telegram, the bot literally just sends a gentle automated push when someone owes money.

Question for the PH community: How do you currently handle shared expenses with your partner or roommates? Do you use a specific app (like Splitwise), an Excel sheet, or just rely on memory?