Train Clock vs 心臓くん
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Train Clock
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This is an app that helps you learn how to read a clock. The minute hand is a Shinkansen, the hour hand is a conventional train, and the second hand is a steam locomotive. The trains are displayed randomly. When you tap the Shinkansen icon at the bottom of the screen, the Shinkansen used as the minute hand changes to another Shinkansen. When you tap the conventional train icon, the train used as the hour hand transforms into another train. At the top of the screen, trains stop at a station at random. Every two minutes, a train departs.
心臓くん
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タップして心拍を上げよう！ 心拍が上がるとさまざまな異変が起き始めるかも！ ※このアプリは医療用途ではありません。 ※実際の心拍数を測定する機能はありません。
Screenshots
Verdict
The clearest difference is ads: Train Clock at none against 心臓くん's shown. 心臓くん's advantage is update cadence (daily vs every 23 months). On price, in-app purchases, device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Train Clock ships an update every 23 months, 心臓くん daily. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.
| Parameter | Train Clock | 心臓くん |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 23 months | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 143 MB | 50 MB |
| Age rating | 4+ | 9+ |
| Developer | hiroyuki uchida | Ryo Matsuura |
In-app purchases
Train Clock
No in-app purchases
心臓くん
No in-app purchases
