# Wadokei57 Astronomical clock vs Approximationist World Clock

The clearest difference is update cadence: Wadokei57 Astronomical clock at every 5 days against Approximationist World Clock's every 2 months. Wadokei57 Astronomical clock also leads on iOS requirement (15.6 vs 17.0). Approximationist World Clock's advantage is price ($0.99 vs $3.99). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

Wadokei57 Astronomical clock costs $3.99 and Approximationist World Clock $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Wadokei57 Astronomical clock ships an update every 5 days, Approximationist World Clock every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Wadokei57 Astronomical clock | Approximationist World Clock |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/approximationist-world-clock/id6762967230/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | Paid | Paid |
| Size | 4 MB | 2 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shinichi Sekiguchi](https://appshunter.io/developer/1509262945) | [Simply Useful Apps](https://appshunter.io/developer/321416742) |

## What reviewers say

### Wadokei57 Astronomical clock

[App page](https://appshunter.io/ios/app/wadokei57-astronomical-clock/id6748839654)

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.

**Highlights:** 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

**Features:** Apple Watch app

**In-app purchases:** none


### Approximationist World Clock

[App page](https://appshunter.io/ios/app/approximationist-world-clock/id6762967230)

This app simplifies understanding global time zones with a focus on approximations rather than exact minutes. It helps users quickly see if a time is suitable for others worldwide, making coordination easier for remote teams, travelers, and families.

**Highlights:** Approximation-first time zone display, Compare multiple cities at a glance, Quick overlap spotting for availability, Human-friendly time descriptions, Time slider functionality, Export/import and share team info

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Wadokei57 Astronomical clock free?

Wadokei57 Astronomical clock costs $3.99, with no in-app purchases.

### Is Approximationist World Clock free?

Approximationist World Clock costs $0.99, with no in-app purchases.

### Do Wadokei57 Astronomical clock or Approximationist World Clock have ads?

Neither Wadokei57 Astronomical clock nor Approximationist World Clock shows ads.

### Which is updated more often, Wadokei57 Astronomical clock or Approximationist World Clock?

Wadokei57 Astronomical clock ships an update every 5 days, and Approximationist World Clock every 2 months. Most recently, Wadokei57 Astronomical clock was updated on October 30, 2026 and Approximationist World Clock on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*