Kahei
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Camera currency converter for iPhone

See any price in your money.

Point at a price tag, menu or receipt. Kahei converts it live, even offline.

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Free to scan. No ads, ever.

Commas, dots, zeros. Read right.

A comma marks thousands in Tokyo and cents in Paris. Kahei reads each price the way it's written there, so a zero never slips past you.

  • ¥1,280

    Tokyo. Yen has no cents.

    $8.19

  • 12,80 €

    Paris. The comma is the decimal point.

    $14.88

  • ₫45.000

    Hanoi. The dot marks thousands.

    $1.73

  • ₩15,000

    Seoul. Big number, small price.

    $11.11

In US dollars, at the rates the app ships with.

Built for the moment you pay.

The whole receipt, at once.

Switch to Receipt and every price on a menu or bill converts, with the total on top.

Total · 合計

¥1,080

$6.91

  • 抹茶ラテ¥580$3.71
  • おにぎり¥180$1.15
  • 唐揚げ¥320$2.05

4 prices · live

JPY → USD Offline · rates Sep 6

No signal? Still works.

Rates are saved on your phone, and a new install already has a recent table. Kahei always shows which day they're from.

¥1,280

Trip: Japan $8.19Trip: China $190.73

¥ in Tokyo or Beijing? Your trip decides.

Symbols like $ and ¥ belong to several currencies, so Kahei uses your trip currency. Change it with one tap.

Hold it, fix it, or type it.

Freeze a price to show the cashier, tap a misread number to fix it, or type a price in yourself.

Read on your phone. Never uploaded.

Zero photos sent anywhere, zero accounts, zero ads. Your scan history stays on your iPhone.

貨幣

Kahei, said kah-HAY.

It's the Japanese word for currency.

Questions

Is Kahei free?

Scanning prices is free. There are no ads, ever, and you don't need an account.

Does it work offline?

Yes. Exchange rates are saved on your phone, and a new install already includes a recent rate table, so it converts with no SIM and no Wi-Fi. It always shows the date of the rates it is using.

Where do the rates come from?

The European Central Bank's daily reference rates. For currencies the ECB doesn't publish, such as the Vietnamese dong, Kahei uses other central banks' rates, collected by the open-source Frankfurter project. Daily rates are plenty for shop prices.

What if it picks the wrong currency?

Symbols like $ and ¥ belong to several currencies, so Kahei assumes your trip currency. Tap the currency pair at the top of the camera to change it.

Do my photos leave my phone?

No. Prices are read on your iPhone and nothing the camera sees is uploaded. The only thing Kahei downloads is the daily rate table.

Which phones does it run on?

iPhones with iOS 16 or later. There is no Android version yet.

Never misread a zero again.

Kahei

For iPhone with iOS 16 or later

Get the app