# BTワットチェッカー vs NFT Shelf

BTワットチェッカー and NFT Shelf are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

BTワットチェッカー ships an update every 3 months, NFT Shelf every 2 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | BTワットチェッカー | NFT Shelf |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 35.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 3 MB | 24 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RATOC Systems, Inc.](https://appshunter.io/developer/568725272) | [一般社団法人ジャパン・コンテンツ・ブロックチェーン・イニシアティブ](https://appshunter.io/developer/1789305889) |

## What reviewers say

### BTワットチェッカー

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

Monitor and control power consumption with real-time data visualization. Convert energy usage into electricity costs and CO2 emissions, with historical data presented in graphs. Save measurement data to CSV files and remotely manage power ON/OFF.

**Highlights:** Real-time power, current, and voltage display, Convert energy usage to cost and CO2 emissions, Historical data in bar graphs (hourly, daily, monthly, yearly), Save measurement data to CSV, Remote power ON/OFF control

**Features:** macOS Compatibility

**In-app purchases:** none


### NFT Shelf

[App page](https://appshunter.io/ios/app/nft-shelf/id6446070816)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### 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.

### Is NFT Shelf free?

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

### Do BTワットチェッカー or NFT Shelf have ads?

Neither BTワットチェッカー nor NFT Shelf shows ads.

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

BTワットチェッカー ships an update every 3 months, and NFT Shelf every 2 months. Most recently, BTワットチェッカー was updated on November 3, 2026 and NFT Shelf on October 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.*