Comparison

Old Japanese Clock vs CheckTimeYo

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

Head to head
About

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 Useful for historical document analysis and recreating ancient Japanese lifestyles.

Highlights
  • 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  • Useful for historical document analysis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)
Features
Read full description

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 This app proves invaluable when reading Japanese historical documents, adjusting Japanese clocks (Wadokei), or recreating the lifestyle of ninjas and samurais, among other apps.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.

About

CheckTimeYo

Features
Read full description

'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

Old Japanese Clock3 screens
CheckTimeYo4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Old Japanese Clock versus CheckTimeYo: the parameters behind the verdict, then further details
ParameterOld Japanese ClockCheckTimeYo
Price$3.99Free — better
Rating5.0 (1 ratings) — better—
Positive reviews57.1% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better17.4
Further details — not scored
Size9 MB12 MB
Age rating4+4+
DeveloperTakafumi AMANOMasayoshi Ueda

In-app purchases

None

Old Japanese Clock

No in-app purchases

None

CheckTimeYo

No in-app purchases

Questions

Is Old Japanese Clock free?
Old Japanese Clock costs $3.99, with no in-app purchases.
Is CheckTimeYo free?
CheckTimeYo is free to download, with no in-app purchases.
Do Old Japanese Clock or CheckTimeYo have ads?
Neither Old Japanese Clock nor CheckTimeYo shows ads.
Which is updated more often, Old Japanese Clock or CheckTimeYo?
Old Japanese Clock ships an update every 3 months, and CheckTimeYo every 6 weeks. Most recently, Old Japanese Clock was updated on September 22, 2026 and CheckTimeYo on December 2, 2025.

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