Compare 2 to 6 options
Add options A to F, type price and quantity, and the cheapest per unit is highlighted in lime. Every other option shows how many percent more it costs.
Offline · No account · No ads
Know the real price.
Two packs, three prices, four sizes — which one is actually cheaper? Type what you see on the shelf and Centwise tells you the price per 100 g, per litre or per piece. Instantly, on your phone, with nothing sent anywhere.
Coming soon onGoogle Play
Android 8.0 and up. Works without an internet connection.
Centwise
EUR
CompareListsHistory
Option B wins · 13% cheaper per 100 g
WeightVolumeCountLength
per 100 gper kgper lb
A
Oats
1.89500g
0.38EUR / 100 g
+15%
+15%
B
Oats
3.291kg
0.33EUR / 100 g
cheapest
cheapest
C
Oats
2.99750g
0.40EUR / 100 g
+21%
+21%
+ Add option
ClearSave to history
What it does
Two jobs. Done well.
Compare prices per unit, and keep shopping lists with a running total. That is the whole app — no feed, no sign-up, no upsell.
Units that just work
Grams, kilos, ounces, pounds; millilitres, litres, US and UK fluid ounces, gallons; pieces and packs; metres, centimetres, feet. Mix them freely in one comparison.
Your base unit
Read results per 100 g, per kg or per lb; per 100 ml, per litre or per fl oz; per piece; per metre. Pick a default per category in Settings.
Shopping lists with totals
Items with quantity and estimated price, a check-off box, and a sticky "Est. total" chip that updates as you tick things off. Create, rename, duplicate or delete lists.
Share a list as text
Send a plain-text copy of any list to a family member through whichever messaging app you already use. Centwise itself never connects to the internet.
History you can reopen
Save a comparison and it lands in History with the date, category and winner line. Tap to reopen it in Compare and change the numbers next time.
How it works
Three taps to the verdict
Type what the shelf says
Price and quantity for each option, straight from the label. Comma or dot decimals — both work. An optional name helps you remember which was which.
Pick the unit
Choose a category (Weight, Volume, Count, Length) and the unit printed on the pack. Centwise converts everything to a common base before comparing.
Read the verdict
The lime banner at the top names the winner and says how much cheaper it is. Save it to History if you want to find it again.
A 1.89 ÷ 500 g → 0.38 / 100 g
B 3.29 ÷ 1 kg → 0.33 / 100 g ✓
C 2.99 ÷ 750 g → 0.40 / 100 g
Privacy
Nothing leaves your phone. Nothing.
Centwise has no server, no account and no network permission. Your comparisons, lists and settings live in a database inside the app's private folder on your device.
Offline
The app does not request the Internet permission, so it technically cannot send or receive anything.
No account
No sign-up, no login, no e-mail address. Open the app and start typing.
No ads
No ad SDK, no analytics SDK, no advertising ID, no tracking of any kind. Zero permissions declared.
Read the full Privacy Policy or see how to delete your data.
FAQ
Questions, answered
Does Centwise need an internet connection?
No. The app is built without the Internet permission, so it works identically in a basement supermarket, on a plane or in airplane mode. Nothing is downloaded and nothing is uploaded.
Where do the prices come from?
From you. Centwise does not download price lists or product databases. You type the price and quantity printed on the shelf label, and the app does the maths. If a number is typed wrongly, the result is wrong too — so double-check what you enter.
Does it convert currencies?
No. The currency you see (for example "EUR") is just a label, taken from your device's language and region settings and changeable in Settings. The app never converts amounts between currencies; all options in one comparison are assumed to be in the same currency.
Where is my data stored, and is it backed up?
In a local database inside the app's private storage on your device. If you have Android's "Back up to Google Drive" turned on, Android may include Centwise's data in your device backup, under your own Google account. You can turn that off in Android settings. Uninstalling the app deletes its data from the device. Details are on the Delete your data page.
Is there an account, ads or in-app purchases?
None of the three. There is no sign-up, no ads and nothing to buy inside the app. All features are available to everyone who installs it.
Stop guessing at the shelf.
Compare per unit, keep your list, and know the real price every time.
Coming soon onGoogle Play