# EM3720 vs Smart iMeters

The clearest difference is update cadence: EM3720 at every 4 months against Smart iMeters's every 20 months. EM3720 also leads on iOS requirement (11.0 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.

EM3720 ships an update every 4 months, Smart iMeters every 20 months. The most recent releases landed on October 5, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | EM3720 | Smart iMeters |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 20 months |
| Size | 6 MB | 29 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ZHANGZHOU EASTERN INTELLIGENT METER CO., LTD.](https://appshunter.io/developer/1064839954) | [Changzhou Haoyi Technology Co.,Ltd.](https://appshunter.io/developer/6775329697) |

## What reviewers say

### EM3720

[App page](https://appshunter.io/ios/app/em3720/id1376380656)

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart iMeters

[App page](https://appshunter.io/ios/app/smart-imeters/id6450159159)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EM3720 free?

EM3720 is free to download, with no in-app purchases.

### Is Smart iMeters free?

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

### Do EM3720 or Smart iMeters have ads?

Neither EM3720 nor Smart iMeters shows ads.

### Which is updated more often, EM3720 or Smart iMeters?

EM3720 ships an update every 4 months, and Smart iMeters every 20 months. Most recently, EM3720 was updated on October 5, 2026 and Smart iMeters on October 3, 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.*