# -活動量計- vs Corelax

The clearest difference is update cadence: Corelax at every 10 days against -活動量計-'s monthly. -活動量計-'s advantage is iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

-活動量計- ships an update monthly, Corelax every 10 days. The most recent releases landed on October 14, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | -活動量計- | Corelax |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Free | — |
| Size | 67 MB | 83 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kashimura Co., Ltd.](https://appshunter.io/developer/1487400380) | [DUNKIT K.K.](https://appshunter.io/developer/1780948183) |

## What reviewers say

### -活動量計-

[App page](https://appshunter.io/ios/app/id1487409825)

This app tracks daily activity with heart rate monitoring to help you stay motivated. It records data on the device for easy syncing with your smartphone at home. Data can be synced with Apple Health for a consolidated view of your fitness.

**Highlights:** Heart rate monitoring, Step tracking, Goal setting, On-device data recording, Smartphone syncing, Apple Health integration

**Features:** macOS Compatibility

**In-app purchases:** none


### Corelax

[App page](https://appshunter.io/ios/app/corelax/id6752983129)

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

**In-app purchases:** none


## Frequently asked questions

### Is -活動量計- free?

-活動量計- is free to download, with no in-app purchases.

### Is Corelax free?

Corelax is free to download, with no in-app purchases.

### Do -活動量計- or Corelax have ads?

Neither -活動量計- nor Corelax shows ads.

### Which is updated more often, -活動量計- or Corelax?

-活動量計- ships an update monthly, and Corelax every 10 days. Most recently, -活動量計- was updated on October 14, 2026 and Corelax on September 27, 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.*