Budget apps fail because they answer a question you were not asking. Pick by the question.
You are travelling and spending in another currency.
One-time purchase; no subscription.
App Store'dan indir →You want to feel a price before you pay it.
One-time purchase; no subscription.
App Store'dan indir →Same, free to start.
Free to download; one-time lifetime unlock.
App Store'dan indir →No. You record what you spend.
No.