Saleproof

About this app

What Saleproof does

That "SALE $3.99" tag means nothing if you don't know what the item cost last month. Saleproof is the old-school grocery price book, rebuilt for the checkout line: log a price in seconds — item, store, price, package size — and your phone quietly becomes the one source of truth flyers and shelf tags can't fool. The heart of the app is the deal check. Standing in the aisle, pull up any item and Saleproof compares today's tag against your own logged history at that store and others nearby: a clear verdict — genuine deal, normal price dressed up in yellow, or actually more than you paid in March. Because everything is normalized to unit price, shrinkflation gets caught too; when the box shrinks from 13 oz to 11 oz at the same sticker, your per-ounce number jumps and Saleproof says so. Over time, your log becomes something no government statistic can give you: a personal inflation view. See what your real basket costs month over month, which items are climbing fastest, and which store has genuinely drifted expensive — not vibes, your receipts. Saleproof is completely free and 100% offline. No account, no sign-in, no internet required — every price you log is stored privately on your device with SwiftData and never leaves it. • Ten-second price logging by item, store, and package size • Deal check: today's tag vs. your own price history, with a plain verdict • Automatic unit-price math (per oz, lb, count) across sizes and stores • Per-item price timelines with best-ever and typical price • Personal basket inflation chart, month over month • Free, offline, no account — your data stays on your phone Download Saleproof and stop taking the shelf tag's word for it.