Dozen Clock vs Wadokei57 Astronomical clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dozen Clock
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Dozen Clock shows the time in a different way than other clocks and watches. In digital and analog format, too. It enables the user to have a tricky but still precise display of time enabling perhaps new ideas to root and grow. Released currently exclusively for Apple products, the application is able to display the date also in the format according to the Japanese calendar. INSTRUCTIONS: The biggest rectangle in the middle shows the minutes ( numbers outside the circle ). The small rectangle in the middle shows the hour ( darker numbers inside the circle ). The small red rectangle in the middle shows the seconds ( no numbers since it functions like in normal clocks ). "Think different." - Steve Jobs
Wadokei57 Astronomical clock
This app combines a traditional Japanese clock based on sunrise and sunset with a miniature planetarium. It displays celestial movements, moon phases, and seasonal changes, all optimized for Apple Watch.
- Traditional Japanese time system
- Miniature planetarium with star simulation
- Moon phase and seasonal displays
- Complications for Moon, Sun, Venus
- Time navigation via crown rotation
- Offline operation
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This Apple Watch app combines a Japanese "Wa-dokei" (traditional Japanese clock) based on sunrise and sunset with the world's smallest planetarium. The red hand at the top of the clock shows the current time. The center hand indicates the phases of the moon and the seasons. ● Key Features ・Complications for the Moon, Sun, Venus, and traditional Japanese time ・Traditional Japanese time: A system dividing the day (sunrise to sunset) and night (sunset to sunrise) into six segments each ・Displays time periods based on the 12 Chinese Zodiac signs, synchronized with local sunrise and sunset times based on latitude and longitude ・Simulates the starry sky for locations around the world ・Time navigation by rotating the crown ・Displays a gradient on the day/night ring representing night sky brightness based on moon phase and altitude ●About WADOKEI The ancient Japanese WADOKEI has 12 animals named for each hour of the day. ・子: Mid-night – when the Rat is most active. ・丑: Early hours of night – when the Ox is chewing the cud. ・寅: Late hours of night – when the Tiger is prowling and seeking food. ・卯: Sunrise – when the Hare and the Rabbit are busy foraging for food. ・辰: Early morning – when the divine Dragon rises to control the rain (the dawn sunrise determining the day’s weather). ・巳: Mid-morning – when the Snake becomes active. ・午: Mid-day – when the Horse cavalry return from drill. ・未: Early-afternoon – when the Sheep is eating grass. ・申: Mid-afternoon – when the Monkey becomes active hunting scraps. ・酉: Late-afternoon – when the C**k returns from the forest to roost. ・戌: Early-evening – when the Dog keeps watch. ・亥: Late-evening – when everything is quiet and the Pig or Boar forages. (source:wadokei.org) In this app, the hour of 酉 is set to the time of sunset. ● Celestial Simulation ・Real-time Celestial Calculation: Accurate sunrise and sunset times for your current location. ・Constellation Display: Accurately depicts over 1,000 stars and 88 constellations. ・Sun and Moon Orbits: Track the movement of celestial bodies in real time. ・Tracks the movement of Venus, Mars, Jupiter, and Saturn in real time. ●Privacy & Security ・Location Information: Used Only for Astronomical Calculations; No External Transmission ・Offline Operation: No Internet Connection Required ・Data Protection: All Calculations Performed Locally ・Battery Optimization: Long-Lasting Operation with Efficient Algorithms ● 24 Solar Terms Calendar ・Calculates and displays the 24 solar terms based on the solar orbital position ・Moon Phase Display: Precisely reproduces the phases of the moon, from new moon to full moon. Inverted left and right in the Southern Hemisphere. ・Seasonal Hand: Turn the crown to simulate seasonal changes throughout the year. ● Apple Watch Optimization Swipe to switch between Japanese clock display, starry sky display, and settings screen. Switch between Japanese clock display and starry sky display with index finger and thumb gestures. (Series 9 and later) Double-tap the Japanese clock display screen to switch the kanji characters to animal illustrations. Location support: Accurate astronomical calculations anywhere in the world. ● Expanded Starry Sky View Observe the constellations. Turn the crown to move through time. ・The starry sky rotates in real time with the electronic compass. ・Displays the direction and altitude of the stars. ・Displays the positions of the sun and moon. ● Intuitive Operation ・Long Press: A 10-second animation of seasonal changes throughout the year. ・Swipe: Switch between Japanese clock and starry sky view. < Download now > Timeless beauty meets cutting-edge technology Would you like to watch a millennium of time on your wrist? This software uses the following libraries: ●SunCalc Copyright (c) 2025, Vladimir Agafonkin All rights reserved. (BSD-2-Clause license)
Screenshots
Verdict
The clearest difference is update cadence: Dozen Clock at every 2 days against Wadokei57 Astronomical clock's every 5 days. Dozen Clock also leads on price ($1.99 vs $3.99) and device support (5 vs 3). On ads, in-app purchases 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
Dozen Clock costs $1.99 and Wadokei57 Astronomical clock $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Dozen Clock ships an update every 2 days, Wadokei57 Astronomical clock every 5 days. Both last shipped on October 8, 2026.
| Parameter | Dozen Clock | Wadokei57 Astronomical clock |
|---|---|---|
| Price | $1.99 — better | $3.99 |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Every 2 days — better | Every 5 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPod, Apple Watch |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 2 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Gergo Blasko | Shinichi Sekiguchi |
In-app purchases
Dozen Clock
No in-app purchases
Wadokei57 Astronomical clock
No in-app purchases
Questions
Is Dozen Clock free?
Is Wadokei57 Astronomical clock free?
Do Dozen Clock or Wadokei57 Astronomical clock have ads?
Which is updated more often, Dozen Clock or Wadokei57 Astronomical clock?
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