Unit Price Calculator & Book

Price can be misleading when package sizes are different.
Price Defender is a fast unit price calculator and personal price book for grocery shopping, household supplies, refills, bulk packs, and shrinkflation checks.

Compare two products

Enter the price and amount for Item A and Item B. Price Defender calculates the unit price and shows which option is cheaper.

Save prices to your own price book

After comparing, save the price with a product name and optional store name. Your price book shows the latest price, your best saved price, and how the current price compares with previous entries.

Track price changes over time

Open a product history to review saved entries. This helps you notice when a product gets smaller, when the unit price rises, or when today’s price is above your usual best price.

Useful in real shopping situations

- Grocery sizes that look similar but contain different amounts
- Refill packs versus bottles
- Bulk packs versus regular packs
- Sale prices, amount-off deals, tax-excluded prices, and point rewards
- Products sold by weight, volume, or count

Supported units

g, kg, ml, L, oz, lb, fl oz, and pcs.
Switch between per 1 unit and per 100 units where appropriate.

Designed for quick input

The built-in numeric keypad keeps price and amount entry simple. The app moves through the input fields in order, so you can compare prices without fighting the standard keyboard.

No account required

Price Defender is an ad-supported utility app. It is designed to help you make calmer, evidence-based buying decisions before you put an item in the cart.