PriceGrab answers one supermarket question: <i>which of these two products is cheaper per unit?</i> Type the price and quantity of offer A and offer B and the app instantly tells you which is the better deal, by how much you save per unit, and how big the relative discount is. <b>Designed for the aisle, not for the lab</b> • Material Design 3 with full dynamic-color theming on Android 12+ and a hand-tuned WCAG-AA palette on older devices. • Locale-aware decimal input: comma in Spanish, dot in English. No more "is the period a thousands separator?" surprises. • Inputs and result survive screen rotation and language changes. <b>Accessibility-first</b> • Every field has a localized content description that TalkBack reads. • The result card is a polite live region: as soon as both offers parse, the screen reader announces who wins and how much you save. • Non-color cue (a check icon) accompanies the winning offer so the design works in grayscale or for color-vision-deficient users. <b>Privacy by design</b> • 100% offline. The app declares no INTERNET permission. • No analytics, no tracking, no ads, no accounts. • No data ever leaves the device. <b>Open source</b> • MIT licensed. • Reproducible Android build, no proprietary dependencies — F-Droid friendly. • Source code: https://github.com/mablanco/pricegrab