DealCheck
🏆 Best Deal
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DealCheck is a free online price comparison tool that works instantly in any supermarket, grocery store, or convenience shop. Auto unit-price calculation — no app download required, runs directly in your browser. Supports Thai and English.
Shelf prices don't tell the whole story. A larger bottle might look expensive, but when broken down to price per ml or g, it could be cheaper than the smaller one. A "Buy 1 Get 1" promo might look like a steal, but compared to a 40% off competing brand, it's not always the better deal.
Comparing unit prices helps you make the right decision every time — saving money on every grocery trip. Over a year, those small differences can add up to hundreds of dollars in savings without changing how you shop.
Supermarket promos come in many forms. Understanding the real cost matters:
Pick the promo type in DealCheck and the app calculates the real per-unit cost instantly.
Example 1 — Bottled water: A 600ml bottle at $1 with 20% off vs a 1.5L bottle at $2. Drop both into DealCheck — the large bottle is roughly 33% cheaper per ml.
Example 2 — Shampoo: Brand A at 350ml for $5 with Buy 1 Get 1, vs Brand B at 480ml for $7. DealCheck shows A at $0.007/ml vs B at $0.015/ml — A is more than twice as cheap.
DealCheck was built for everyday shoppers — no accounts, no login, no personal data tracking. All your comparison history stays in your browser's local storage, nothing is sent to any server.
The site shows small banner ads from Google AdSense to support development — no full-screen popups, no intrusive overlays, and your data is never shared. Read more at our Privacy Policy.
Install as a mobile app: tap 📲 in the header → "Add to Home Screen" → use it anywhere, even offline.