Somewhere between the bins and the post office, the “system” was a notes app, three screenshots, and vibes. No idea if the week was actually profitable.
So we built the spreadsheet that should’ve existed: every platform’s fees calculated, hauls split across items automatically, the death pile counted honestly (rude, but fair), and a January with no 1099-K panic.
ThriftMath is that spreadsheet — plus the trackers that grew out of it. When you email support, a real human answers.