It's a Flutter project under the primary name "calculate_exchange_v2".
This repository is my second complete project. Since I made it myself from scratch, it has many UI/UX flaws. You can download the application on google play.
Here is a view of how it works:
You can edit each transition(or share) that you add or add people with 0 spent money to calculate their share. In the end, the calculate button will calculate shares depending on the data you added.
I also should mention some of the animations. On the sheet page, when it's empty, you can see the add card changes scale, and the cloud picture rotates, at the same time.
When you enter a sheet with data, they appear in sequence. You can see a glimpse in the Change name inside sheet.