Install in two steps.

F-Droid is a free app store for open-source apps. Install through it and Android skips the security detours.

1

Get the F-Droid app

12 MB, straight from f-droid.org. Android asks once to let your browser install it.

Download F-Droid

Already have F-Droid? Go to step 2.

2

Open UPI Expense Tracker in F‑Droid

It opens straight on our app. Tap Install, and allow F-Droid once when Android asks. The first time, F-Droid takes a minute to load.

Open in F-Droid

Prefer the plain file? Download the APK. It needs Play Protect switched off and a restricted-settings unlock.