PerunitFind out which pack is actually cheaper
For the grocery aisle. Type the shelf price and size, and see the price per ounce, kg or sheet, with multipacks and coupons counted.
"Is the big pack really the better deal?"
Shelf tags make you do math while holding a basket.
The math changes every aisle. One pack is 12 rolls of 110 sheets, the other 8 rolls of 140.
Ounces against grams, again. One brand prints fl oz, the other litres, and the tag uses a third unit.
The coupon changes the answer. $3 off or buy 2 get 1 free makes the "expensive" one cheaper.
Type what's on the shelf. Perunit does the rest.
The cheapest lights up
Add as many sizes as the shelf has. The cheapest per unit turns yellow, and every other pack shows how much more it costs, like +9%.
A plain sentence gives you the answer: "Costco is 8% cheaper than the priciest option."
Multipacks and deals, counted
Type multipacks the way they're printed and Perunit works out the price per sheet, can, pod or diaper.
Add a % off, a coupon, buy N get M free, a second-item discount or shipping. The real price after the deal is what gets compared.
Mixed units, compared fairly
Ounces against grams, litres against fl oz, pounds against kilograms. Perunit converts 35 units in five kinds before comparing, from price per ounce to price per kg or per 100 g. Even cubic feet of mulch.
A price book for what you buy often
Save a comparison and Perunit remembers which store had the best price per unit. Five items are free; one short video adds five more slots, and they stay yours.
How it works
Under a minute, standing in the aisle.
- Install PerunitFree on Google Play, no account.
- Type the first packShelf price, amount and unit.
- Add the other sizesAs many as the shelf has.
- See the best dealSave it to remember the store.
See it in 25 seconds
Add a pack, watch the best deal move, and see a coupon change the answer.
Questions
Is Perunit really free?
Yes. Comparing prices is free with no limit. Ads keep it free, and a short video adds price-book slots if you want more than five.
Does it work without signal in the store?
Yes. Everything runs on your phone, so it works offline, even in a basement with no reception.
What data does Perunit collect?
Your comparisons stay on your phone. There's no account and no analytics. Ads use your advertising ID, and you can change your ad choices in Settings. Details are in the privacy policy.
Can it compare different units, like oz and grams?
Yes. Pick any unit for each item and Perunit converts before comparing. It tells you when two items can't be compared, like weight against volume.
What if I delete something by mistake?
Tap Undo. Comparisons also save as you type, so closing the app never loses them.