# CKJ App vs BTワットチェッカー

The clearest difference is update cadence: CKJ App at every 5 weeks against BTワットチェッカー's every 3 months. CKJ App also leads on iOS requirement (11.0 vs 15.6). 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.

CKJ App ships an update every 5 weeks, BTワットチェッカー every 3 months. The most recent releases landed on September 12, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | CKJ App | BTワットチェッカー |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Size | 7 MB | 3 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ELM Inc.](https://appshunter.io/developer/893982377) | [RATOC Systems, Inc.](https://appshunter.io/developer/568725272) |

## What reviewers say

### CKJ App

[App page](https://appshunter.io/ios/app/ckj-app/id893982374)

**Features:** macOS Compatibility

**In-app purchases:** none


### BTワットチェッカー

[App page](https://appshunter.io/ios/app/bt/id1490362165)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CKJ App free?

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

### Is BTワットチェッカー free?

BTワットチェッカー is free to download, with no in-app purchases.

### Do CKJ App or BTワットチェッカー have ads?

Neither CKJ App nor BTワットチェッカー shows ads.

### Which is updated more often, CKJ App or BTワットチェッカー?

CKJ App ships an update every 5 weeks, and BTワットチェッカー every 3 months. Most recently, CKJ App was updated on September 12, 2026 and BTワットチェッカー on September 9, 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.*