This looks like a clone of YNAB. Looks to be open sourced though not actively developed. I wonder if this might be a way off the legacy YNAB.

I've been using YNAB classic for many years even after support has been dropped. The Android app is no longer supported so its only a matter of time before I am forced to either go with their monthly subscription or find something new. I'm passively looking for my next budget system.