# iService/ IoT Sensing vs OCR Server

The clearest difference is in-app purchases: iService/ IoT Sensing at none against OCR Server's 1. iService/ IoT Sensing also leads on iOS requirement (12.1 vs 18.4). OCR Server's advantage is update cadence (every 4 days vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. OCR Server sells 1 one-off in-app purchase. iService/ IoT Sensing asks for nothing beyond the download.

iService/ IoT Sensing ships an update every 5 weeks, OCR Server every 4 days. The most recent releases landed on September 15, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | iService/ IoT Sensing | OCR Server |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Size | 29 MB | 19 MB |
| Requires iOS | **12.1** | 18.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Advantech](https://appshunter.io/developer/413213069) | [Wei-Cheng Ling](https://appshunter.io/developer/1155984309) |

## What reviewers say

### iService/ IoT Sensing

[App page](https://appshunter.io/ios/app/iservice-iot-sensing/id1663392306)

**Features:** macOS Compatibility

**In-app purchases:** none


### OCR Server

[App page](https://appshunter.io/ios/app/ocr-server/id6749533041)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $4.99 | one-time |


## Frequently asked questions

### Is iService/ IoT Sensing free?

iService/ IoT Sensing is free to download, with no in-app purchases.

### Is OCR Server free?

OCR Server is free to download, with in-app purchases available.

### Do iService/ IoT Sensing or OCR Server have ads?

Neither iService/ IoT Sensing nor OCR Server shows ads.

### Which is updated more often, iService/ IoT Sensing or OCR Server?

iService/ IoT Sensing ships an update every 5 weeks, and OCR Server every 4 days. Most recently, iService/ IoT Sensing was updated on September 15, 2026 and OCR Server on September 8, 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.*