# Optical Surface Recognition vs VALK Tools

Optical Surface Recognition and VALK Tools are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 20, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Optical Surface Recognition | VALK Tools |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | — |
| Size | 17 MB | 85 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Engineering Director, Inc.](https://appshunter.io/developer/1480828201) | [ITRoots](https://appshunter.io/developer/1086447931) |

## 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


### VALK Tools

[App page](https://appshunter.io/ios/app/valk-tools/id6754689250)

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

**In-app purchases:** none


## Frequently asked questions

### Is Optical Surface Recognition free?

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

### Is VALK Tools free?

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

### Do Optical Surface Recognition or VALK Tools have ads?

Neither Optical Surface Recognition nor VALK Tools shows ads.

### Which is updated more often, Optical Surface Recognition or VALK Tools?

Optical Surface Recognition ships an update every 2 weeks, and VALK Tools every 2 weeks. Most recently, Optical Surface Recognition was updated on September 20, 2026 and VALK Tools on September 17, 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.*