Checksum
In-depth reviewChecksum is a progressive web app that reads restaurant receipts, verifies line-item amounts, and splits bills between diners. Built with a mobile-first design, it displays receipt totals with expandable breakdowns showing subtotal, tip, and final amounts. The interface uses a dark theme with card-based layouts and safe-area insets for modern devices. Desktop users see a centered column instead of full-width stretching. Created by @magasine, it falls under utilities and finance categories.
Checksum opens in a browser tab — no download.
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How to install Checksum as a PWA
Why we recommend Checksum
Checksum tackles a specific friction point: verifying restaurant bills and dividing costs among friends. The app's strength lies in its focused scope—it reads receipts, checks arithmetic, and handles splits without feature bloat. The interface shows thoughtful mobile optimization with safe-area support for notched screens and a portrait-locked orientation that makes sense for scanning tall receipts. Desktop users get a contained 440px column rather than an awkwardly stretched layout, preserving the mobile-first experience. The expandable total breakdown (subtotal, tip, final amount) uses high-contrast neon accents for quick scanning. With a registered service worker, the app works offline once loaded. The dark theme with carefully chosen contrast ratios (background #101214, card layers, dim text at #A2AAB6) reduces eye strain in restaurant lighting.
Best use cases
Best for: diners who want to quickly verify restaurant bills before paying, especially when splitting costs among multiple people. Useful when you suspect arithmetic errors on printed receipts or need to divide a bill fairly based on what each person ordered. The mobile-first design makes it practical to use at the table without fumbling with desktop-oriented interfaces. The offline capability means it works in venues with poor connectivity.
Honest limitations
The landing page shows only the interface structure—no screenshots of actual receipt scanning in action, so the reading mechanism (OCR, manual entry, or camera integration) remains unclear. No visible pricing tiers or payment gates suggest it's free, but capabilities like maximum party size for splits or receipt-complexity limits aren't documented. The app is portrait-only, which may frustrate users who prefer landscape mode. Not designed for complex expense reports or ongoing budget tracking—it solves the single-transaction restaurant scenario.
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