A true kind of story
The fee that was charged once and booked twice.
A payout lands. The tracker's number and the bank's number disagree by $42.17. Most tools would bury that inside “estimated profit” and you'd carry a wrong number into every decision — pricing, ad budgets, taxes — forever.
PennyProfit diffs every balance-transaction line against its own ledger, finds the one that doesn't match, and tells you in one sentence: a PayPal fee on order #1043 was logged twice.
Not a mystery number. A line item, with a name.