# Optical Surface Recognition vs StressTable2021

The clearest difference is in-app purchases: Optical Surface Recognition at none against StressTable2021's 1. StressTable2021's advantage is device support (4 vs 2). On price, ads and iOS requirement there is nothing between them.

Both are free to download. StressTable2021 sells 1 one-off in-app purchase. Optical Surface Recognition asks for nothing beyond the download.

## The numbers

| Metric | Optical Surface Recognition | StressTable2021 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/optical-surface-recognition/id1480828202/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Free | — |
| Size | 17 MB | 20 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Engineering Director, Inc.](https://appshunter.io/developer/1480828201) | [Shabbir Ahmed](https://appshunter.io/developer/1083166021) |

## What reviewers say

### Optical Surface Recognition

[App page](https://appshunter.io/ios/app/optical-surface-recognition/id1480828202)

This utility app uses computer vision to scan surfaces for signs of corrosion on various metal types. It allows users to capture photos and record videos of detected corrosion, saving them with a proprietary score.

**Highlights:** Detects corrosion on various metal surfaces, Scans flat metal, nails, bolts, signs, poles, grates, Captures photos with corrosion score, Records videos with corrosion score, Saves media to device photo roll

**Features:** macOS Compatibility

**In-app purchases:** none


### StressTable2021

[App page](https://appshunter.io/ios/app/stresstable2021/id6461216630)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Non-Consumable Subscription | $9.99 | one-time |


## Frequently asked questions

### Is Optical Surface Recognition free?

Optical Surface Recognition is free to download, with no in-app purchases.

### Is StressTable2021 free?

StressTable2021 is free to download, with in-app purchases available.

### Do Optical Surface Recognition or StressTable2021 have ads?

Neither Optical Surface Recognition nor StressTable2021 shows ads.

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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.*