# PDF Reader vs EM3720

The clearest difference is ads: EM3720 at none against PDF Reader's shown. EM3720 also leads on update cadence (every 4 months vs every 114 months) and iOS requirement (11.0 vs 14.0). On price, 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.

PDF Reader ships an update every 114 months, EM3720 every 4 months. The most recent releases landed on May 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | PDF Reader | EM3720 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 114 months | **Every 4 months** |
| Size | 10 MB | 6 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ramalingam Sivaramakrishnan](https://appshunter.io/developer/892706271) | [ZHANGZHOU EASTERN INTELLIGENT METER CO., LTD.](https://appshunter.io/developer/1064839954) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader/id1084685959)

**Features:** macOS Compatibility

**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 PDF Reader free?

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

### Is EM3720 free?

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

### Do PDF Reader or EM3720 have ads?

PDF Reader shows ads; EM3720 does not.

### Which is updated more often, PDF Reader or EM3720?

PDF Reader ships an update every 114 months, and EM3720 every 4 months. Most recently, PDF Reader was updated on May 17, 2026 and EM3720 on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*