Old Japanese Clock vs CheckTimeYo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Old Japanese Clock
Convert between modern and historical Japanese timekeeping systems. Explore fixed and temporal hour systems used from the Nara to Edo eras. Useful for historical document analysis and recreating ancient Japanese lifestyles.
- Converts between modern and old Japanese time
- Fixed hour system with six types
- Temporal hour system with seven types
- Supports Engishiki, Guchureki, and more
- Useful for historical document analysis
- Aids in adjusting Japanese clocks (Wadokei)
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This app serves as a time converter between the current hour system and old Japanese hour systems. It offers two options: a fixed hour system and a temporal hour system. The fixed hour system includes six different types: Engishiki, Guchureki, Semmyoreki, Semi-Engishiki, Kanagoyomi, and Shichiyoreki. These systems were primarily used from the Nara era through to the Edo era (c. 710–1872). On the other hand, the temporal hour system encompasses seven types: Temporeki, Koten, Shaku-Sun-Bu (Class 1 and 2), and Three-Divided (Class 1 to 3). These were predominantly used during the late Edo era (1844–1872). This app proves invaluable when reading Japanese historical documents, adjusting Japanese clocks (Wadokei), or recreating the lifestyle of ninjas and samurais, among other apps. For more detailed information, please visit the developer's website. ■ Exemption from Liability ASTI shall not be held responsible for any consequences arising from the use of this app. We disclaim all liability for any potential damages, injuries, or losses resulting from app usage.
CheckTimeYo
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'CheckTimeYo' is a retro-looking clock app that displays the time, the time from cities around the world (489 of them) of your choice, a feed of your choice, a calendar, and today's moon phase. With 390 themes to choose from, you can even select a font to your liking. Download now! It's free, with no ads, no in-app purchases, and no catch! Using this app is easy. For many settings, there's no need to open the Settings screen. Just tap on the area of the screen where you want to make changes. For example, if you want to change the date format to your liking, simply tap on the date displayed on the screen.
Screenshots
Verdict
The clearest difference is price: CheckTimeYo at Free against Old Japanese Clock's $3.99. CheckTimeYo also leads on update cadence (every 6 weeks vs every 3 months). Old Japanese Clock's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.4). On ads and in-app purchases 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
CheckTimeYo is free to download; Old Japanese Clock costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Old Japanese Clock ships an update every 3 months, CheckTimeYo every 6 weeks. The most recent releases landed on September 22, 2026 and December 2, 2025 respectively.
| Parameter | Old Japanese Clock | CheckTimeYo |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 57.1% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.4 |
| Further details — not scored | ||
| Size | 9 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Takafumi AMANO | Masayoshi Ueda |
In-app purchases
Old Japanese Clock
No in-app purchases
CheckTimeYo
No in-app purchases
Questions
Is Old Japanese Clock free?
Is CheckTimeYo free?
Do Old Japanese Clock or CheckTimeYo have ads?
Which is updated more often, Old Japanese Clock or CheckTimeYo?
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