Old Japanese Clock vs AKEMUTSU
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 Useful for historical document analysis and recreating ancient Japanese lifestyles.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- Useful for historical document analysis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 This app proves invaluable when reading Japanese historical documents, adjusting Japanese clocks (Wadokei), or recreating the lifestyle of ninjas and samurais, among other apps.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.
AKEMUTSU
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江戸時代の「不定時法」で現在の時刻を表示する和の時計アプリです。 ◆ 不定時法とは 日の出と日の入りを基準に一日を分ける、江戸時代の時間の数え方。季節によって一刻（いっとき）の長さが変わる、自然と共に生きる時間感覚を体験できます。 ◆ 主な機能 ・十二支の刻を美しい書道フォントで表示 ・日の出・日の入りに連動した昼夜グラデーション ・世界の主要都市に対応 ・和の呼吸モード（瞑想タイマー） ・鎖国モード（通知を一時停止） ・ウィジェット対応（ロック画面・ホーム画面） ・Apple Watch対応 ◆ こんな方におすすめ ・日本の伝統文化に興味がある方 ・マインドフルネスや瞑想を実践している方 ・ユニークな時計アプリを探している方 ・江戸時代の暮らしに思いを馳せたい方
Screenshots
Verdict
The clearest difference is price: AKEMUTSU at Free against Old Japanese Clock's $3.99. AKEMUTSU also leads on update cadence (daily vs every 4 months). Old Japanese Clock's advantage is iOS requirement (15.0 vs 17.0). On ads, in-app purchases and device support 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
AKEMUTSU 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 4 months, AKEMUTSU daily. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Old Japanese Clock | AKEMUTSU |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 62.5% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 9 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Takafumi AMANO | Shoya Inoue |
In-app purchases
Old Japanese Clock
No in-app purchases
AKEMUTSU
No in-app purchases
Questions
Is Old Japanese Clock free?
Is AKEMUTSU free?
Do Old Japanese Clock or AKEMUTSU have ads?
Which is updated more often, Old Japanese Clock or AKEMUTSU?
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