Comparison

US単位コンバーター vs Japan

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

US単位コンバーター

Features
Read full description

アメリカ旅行・留学・駐在・海外生活でよく使う単位や計算を、まとめてすばやく確認できる便利ツールです。 華氏と摂氏、マイルとキロ、ポンドとキログラム、ガロンとリットルなど、日本とアメリカで異なる単位をかんたんに変換できます。さらに、時差計算、 チップ計算、USD/JPY為替換算、日米の祝日確認、日本住所の英語表記変換にも対応。 レストランでの会計、運転中の距離感、天気予報の温度、買い物中の重さや容量など、アメリカで「これ日本の感覚だとどれくらい?」と思ったときに役 立ちます。 主な機能: - 温度、距離、長さ、重さ、容量などの単位変換 - mph / km/h、mpg / km/L など車関連の変換 - US / JP の靴・服・指輪サイズ変換 - アメリカと日本の時差計算 - チップ計算と割り勘計算 - USD / JPY 為替換算 - アメリカ・日本の祝日カレンダー - 日本住所の英語表記変換 - 日本語 / 英語表示切り替え アメリカに行く前の準備にも、現地での生活にも使いやすい、シンプルな日米変換アプリです。

About

Japan

Easily convert between Japanese and US units for length, weight, speed, volume, temperature, area, currency, and time zones. This tool is useful for travel, daily life, work, and study, offering a wide range of conversion categories.

Highlights
  • Length conversion
  • Weight conversion
  • Speed conversion
  • Volume conversion
  • Temperature conversion
  • Area conversion
  • Currency conversion
  • Timezone conversion
Features
Read full description

This is a handy tool for easy and convenient everyday unit conversions. It is equipped with features useful in various situations, from travel and daily life to work and study. With this app, you can convert units in the following categories: 1. Length (millimeters, centimeters, meters, kilometers ↔ inches, feet, yards, miles) 2. Weight (milligrams, grams, kilograms, tons ↔ ounces, pounds, stones, short tons) 3. Speed (meters/second, kilometers/hour ↔ feet/second, miles/hour) 4. Volume (cubic millimeters, cubic centimeters, cubic meters, liters ↔ cubic inches, cubic feet, fluid ounces, gallons) 5. Temperature (Celsius ↔ Fahrenheit) 6. Area (square millimeters, square centimeters, square meters, hectares ↔ square inches, square feet, acres) 7. Currency (dollars ↔ yen, using the latest exchange rate) 8. Timezone (Japan Standard Time ↔ Eastern Standard Time, Central Standard Time, Mountain Standard Time, Pacific Standard Time, Alaska Standard Time, Hawaii Standard Time) [Premium Version] - No ads within the app - Unlimited number of favorite registrations Terms of Use: https://kn-factory.hatenablog.com/entry/2023/06/25/124505 Privacy Policy: https://kn-factory.hatenablog.com/entry/2023/06/25/124429

Screenshots

US単位コンバーター4 screens
Japan3 screens

Verdict

The call

The clearest difference is in-app purchases: US単位コンバーター at none against Japan's 1. Japan's advantage is update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Japan sells 1 one-off in-app purchase. US単位コンバーター asks for nothing beyond the download.

UpkeepUpdate frequency

US単位コンバーター ships an update every 3 weeks, Japan weekly. The most recent releases landed on June 20, 2026 and July 18, 2026 respectively.

Scorecard2 real differences · 7 level
US単位コンバーター versus Japan: the parameters behind the verdict, then further details
ParameterUS単位コンバーターJapan
PriceFreeFree
Rating—4.8 (16 ratings) — better
Number of ratings—16 — better
Update frequencyEvery 3 weeksWeekly — better
AdsYesYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS16.416.2 — better
Further details — not scored
Size41 MB18 MB
Age rating4+4+
DeveloperTaiki SaitoKoya Nambo

In-app purchases

None

US単位コンバーター

No in-app purchases

1 purchases

Japan

One-time1
  • Premium$3.99

Questions

Is US単位コンバーター free?
US単位コンバーター is free to download, with no in-app purchases.
Is Japan free?
Japan is free to download, with in-app purchases available.
Do US単位コンバーター or Japan have ads?
Both US単位コンバーター and Japan show ads.
Which is updated more often, US単位コンバーター or Japan?
US単位コンバーター ships an update every 3 weeks, and Japan weekly. Most recently, US単位コンバーター was updated on June 20, 2026 and Japan on July 18, 2026.

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