Comparison

Koyomi vs OneHandClock (Pro version)

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

Head to head
About

Koyomi

This app displays traditional Japanese calendars, including lunar phases, zodiac signs, and auspicious days. It integrates with your existing iOS calendar and offers features like printing and PDF sharing. Perfect for those who appreciate traditional calendrical information.

Highlights
  • Standard calendar import and display
  • Detailed Japanese calendar view (zodiac, lunar, etc.)
  • Moon phase and age display
  • Calendar printing and PDF sharing
  • Widget support
  • Monthly/yearly/list calendar views
  • Sunrise and sunset times
Features
Read full description

機能  ・標準カレンダー読込、表示  ・暦を表示   ・日付・曜日・干支・九星・旧暦・潮名・歴日・終日・二十八宿・中段・下段  ・月相、月齢表示  ・カレンダーの印刷  ・「ロルト」でカレンダーの印刷  ・年齢早見表  ・カレンダーをPDFとして共有(Open in…/アクティビティーで他のアプリにPDFを渡せます)  ・ウィジェットに対応(通知センターの「今日」に表示します)  ・月間/年間/一覧カレンダー表示  ・暦日の検索機能(二十四節気・七十二候・雑節・選日・干支・祝日)  ・日の出、日の入り時刻  ・横表示機能 日本人が古くから利用してきた暦には干支・九星・六曜・二十四節気などの歴日があります。 大安は婚礼、旅行、引越、開店などに吉の日 仏滅は全てのことに悪い凶とされる日 先勝は急ぐことや、訴訟などに吉の日、ただし午後からは凶 先負は静かにするのが吉の日 勝負ごとや急用はさけた方がよい日、ただし午後は吉 友引は朝晩は吉の日、正午だけが凶の日、葬式をつつしむ日 赤口は何事をするのにも凶とされる日 ただし正午頃は吉の日 干支は十干と十二支の組み合わせからなる六十干支から成り立ち六十年周期で、日取りや方位などを判断する基になります。 二十四節気は太陽の通り道を24等分した分割点の日を節気とし、陰暦では季節にずれが生じるため季節の指標として用いられました。 そんな日本人が利用している暦をiPhoneで簡単に表示できるのが「こよみ」アプリです。暦なんて気にしないよ、 と言うひとでも、結婚式の日がふさわしい日かどうか知っていた方が知らないよりは良いですよね? 効率や成果を重要視する現代ですが、「はじまり」の日を縁起の良い日からはじめてみませんか? 使い方は簡単!アプリを起動するだけで、月の全ての干支、九星、六曜、二十四節気、その他の雑節が簡単に見られます。 それに、iOSの標準カレンダーも読み込めるので、予定と暦が一度に確認出来ます。 カレンダーの印刷や共有ができます。 watchOSに対応しています。

About

OneHandClock (Pro version)

Experience a minimalist approach to timekeeping with a single-needle clock. Customize backgrounds, dial characters, and clock placement to create a unique visual timepiece. Enjoy both 24-hour and 12-hour formats with optional second-hand functionality.

Highlights
  • Single-needle clock design
  • 24-hour and 12-hour formats
  • Customizable clock position and size
  • Background image or camera feed
  • Customizable dial characters
  • Optional second hand
Features
Read full description

This is a one needle clock. Let's feel the passage of calm time. It is also compatible with iPad. - One-stitch clock   -> 24-hour clock.     The day-time is an upper half and the night-time is a lower half.   -> 12-hour clock.   -> The smallest scale division is 10 minutes. - Three-stitch clock   - > The second hand is a clock which gains smoothly. - You can change the position and size of the clock. - You can choose a camera image or a photo as the background of the clock. - Please write a favorite character in a dial and make it your clock. - If it puts sideways, a status bar will not be displayed. - When continuing displaying in "Auto sleep"-off, we recommend you to connect with a power supply. There is also a free version of the one-hand clock with the same functions.

Screenshots

Koyomi4 screens
OneHandClock (Pro version)4 screens

Verdict

The call

The clearest difference is monetization model: Koyomi at free against OneHandClock (Pro version)'s paid. Koyomi also leads on device support (5 vs 3) and iOS requirement (9.0 vs 15.0). OneHandClock (Pro version)'s advantage is review sentiment (67% vs 58%). On price, rating, ratings volume and update cadence 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

Koyomi costs $1.99 and OneHandClock (Pro version) $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Koyomi against 5.0 for OneHandClock (Pro version). Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews are what separate them: 58% of Koyomi's written reviews are positive against 67% of OneHandClock (Pro version)'s.

UpkeepUpdate frequency

Koyomi ships an update every 5 weeks, OneHandClock (Pro version) every 6 weeks. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
Koyomi versus OneHandClock (Pro version): the parameters behind the verdict, then further details
ParameterKoyomiOneHandClock (Pro version)
Price$1.99$1.99
Rating5.0 (2 ratings)5.0 (2 ratings)
Positive reviews58.3% of reviews66.7% of reviews — better
Number of ratings22
Update frequencyEvery 5 weeks — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS9.0 — better15.0
Further details — not scored
Size18 MB8 MB
Age rating4+4+
DeveloperiWare Inc.Keietsu Yasuhara

Customer experience

Koyomi

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews36 reviews
Positive58.3%
Neutral19.4%
Negative22.2%

OneHandClock (Pro version)

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

In-app purchases

None

Koyomi

No in-app purchases

None

OneHandClock (Pro version)

No in-app purchases

Questions

Is Koyomi free?
Koyomi costs $1.99, with no in-app purchases.
Is OneHandClock (Pro version) free?
OneHandClock (Pro version) costs $1.99, with no in-app purchases.
Which has better reviews, Koyomi or OneHandClock (Pro version)?
Koyomi and OneHandClock (Pro version) are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.
Do Koyomi or OneHandClock (Pro version) have ads?
Neither Koyomi nor OneHandClock (Pro version) shows ads.
Which is updated more often, Koyomi or OneHandClock (Pro version)?
Koyomi ships an update every 5 weeks, and OneHandClock (Pro version) every 6 weeks. Most recently, Koyomi was updated on October 16, 2026 and OneHandClock (Pro version) on October 17, 2026.

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