# JFE vs EM3720

The clearest difference is iOS requirement: EM3720 at 11.0 against JFE's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

JFE ships an update every 3 months, EM3720 every 4 months. The most recent releases landed on October 17, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | JFE | EM3720 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | — |
| Size | 16 MB | 6 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Melaroo LLC](https://appshunter.io/developer/1112233623) | [ZHANGZHOU EASTERN INTELLIGENT METER CO., LTD.](https://appshunter.io/developer/1064839954) |

## What reviewers say

### JFE

[App page](https://appshunter.io/ios/app/jfe-tc-datasheets/id1264150542)

Access and manage your data sheets offline. Save, export, and email documents in PDF format from your mobile device.

**Highlights:** Offline access to data sheets, Save and export PDFs, Email data sheets, Cross-device compatibility

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

**In-app purchases:** none


### EM3720

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JFE free?

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

### Is EM3720 free?

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

### Do JFE or EM3720 have ads?

Neither JFE nor EM3720 shows ads.

### Which is updated more often, JFE or EM3720?

JFE ships an update every 3 months, and EM3720 every 4 months. Most recently, JFE was updated on October 17, 2026 and EM3720 on October 26, 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.*