Potjar is a free Android bill splitter for trips, flatmates and dinners. Split equally, by exact amounts, shares or percent, see balances and the fewest payments to settle up. It works fully offline with no account, ads or analytics, and has no internet permission. Currently in Google Play closed testing: email the developer to join the test.
I wanted a bill splitter that doesn't ask me to sign up, show ads, or cap how many expenses I can add each day. Potjar has no internet permission at all, so everything stays on your phone.