Buy Price Calculator, an iPhone app that works out how big a discount you need before a sale, is listed as Free on its App Store page at the time of writing. The Hong Kong outlet 流動日報 New Mobile Life reported on November 2, 2026 that the original price was US $0.99 and described the offer as limited time.
How long is Buy Price Calculator free?
The tip gives no end date, so the offer can end at any time. The App Store page itself shows only the current price, Free, and does not say whether it is a promotion. Neither source states the Canadian App Store price, so check the listing in your own country before you rely on it.
If the page shows Free on your iPhone, you download it like any other app. The listing says it needs iOS 18.0 or later and takes up 9.6 MB. The developer is Makoto Fukuoka and the age rating is 4+. The listing also names Mac and Apple Vision versions, with their own system requirements.
What does the app do?
It works backward from the price you want to pay. You enter the regular price and the amount you would actually pay, and the app shows the discount percentage needed to get there. The listing gives an example: a regular price of 120 and a target of 90 means you need 25% off.
The other features it lists:
- Saved comparisons that you can name, search, reopen and edit later, with an undo if you delete one by mistake
- An option to account for tax
- A way to explore stacked discounts
- Light and Dark modes, chosen in Settings or following the device setting
- Interface text in English and 51 more languages, including French, Spanish and Punjabi
What does it not do?
The listing is direct about this: the app does not track stores, monitor prices, predict sales or send price-drop alerts. You set the buying threshold and the app does the arithmetic. If you want an app that watches a product and warns you when the price falls, this is not that.
On privacy, the developer’s listing says no data is collected from the app. Apple notes that this information is supplied by the developer and has not been verified by Apple.
Prices
- Now: Free on the App Store page at the time of writing
- Original price: US $0.99, according to 流動日報 New Mobile Life
- Canada: the Canadian App Store price is not stated, so check the listing
- End date: not stated
Who it suits
Shoppers who decide a target price first. If you already know what a jacket or a gadget is worth to you, the app tells you which sale percentage would get you there.
People comparing offers with tax in the mix. The tax option and stacked discounts are for checking whether a promotion really reaches your number.
Anyone who wants a simple tool. It is a calculator with saved notes, not a deal tracker, so it will not find sales for you.
What is still unknown
The listing says the app has not received enough ratings or reviews to show an overview, so there is no user feedback to lean on. We do not know when the price will return, or whether it will go back to US $0.99.
Next step: open the App Store listing on your iPhone and confirm it still says Free. Then try it on one real price you have been watching, using the regular price and your target.
