# Gemetrix vs Sherlock Holmes Detect

The clearest difference is rating: Sherlock Holmes Detect at 3.7 against Gemetrix's 2.2. Gemetrix's advantage is iOS requirement (10.3 vs 14.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

Sherlock Holmes Detect holds the better App Store score, 3.7 against 2.2. Both are backed by a comparable volume of ratings — 5 and 7 respectively.

Both ship on a similar rhythm, roughly monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Gemetrix | Sherlock Holmes Detect |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.2 (5 ratings)](https://appshunter.io/ios/app/gemetrix/id1363103077/reviews) | **[3.7 (7 ratings)](https://appshunter.io/ios/app/sherlock-holmes-detect/id1617998548/reviews)** |
| Number of ratings | 5 | **7** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free | Free |
| Size | 18 MB | 29 MB |
| Requires iOS | **10.3** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [John Chapman](https://appshunter.io/developer/1363103076) | [Mejix](https://appshunter.io/developer/1524792113) |

## What reviewers say

### Gemetrix

[App page](https://appshunter.io/ios/app/gemetrix/id1363103077)

Control your smartphone camera's exposure, ISO, color temperature, and focus for both short-wave and long-wave UV illuminations. Compare captured images side-by-side or with a slider, and save them with clear labeling.

**Highlights:** UV illumination control (SWUV & LWUV), Adjustable exposure, ISO, color temperature, focus, Side-by-side image comparison, Image slider comparison, Save labeled images

**Features:** macOS Compatibility

**In-app purchases:** none


### Sherlock Holmes Detect

[App page](https://appshunter.io/ios/app/sherlock-holmes-detect/id1617998548)

This application connects to a specialized SH box to analyze diamond images. It uses various illuminations to capture photos and distinguish between natural and lab-grown diamonds.

**Highlights:** Connects to SH box, Bluetooth/cable connectivity, Diamond image analysis, Distinguishes natural vs. lab-grown diamonds, Multiple illumination settings

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Gemetrix free?

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

### Is Sherlock Holmes Detect free?

Sherlock Holmes Detect is free to download, with no in-app purchases.

### Which has better reviews, Gemetrix or Sherlock Holmes Detect?

Sherlock Holmes Detect is rated higher. Gemetrix averages 2.2 out of 5 from 5 ratings, while Sherlock Holmes Detect averages 3.7 from 7 ratings.

### Do Gemetrix or Sherlock Holmes Detect have ads?

Neither Gemetrix nor Sherlock Holmes Detect shows ads.

### Which is updated more often, Gemetrix or Sherlock Holmes Detect?

Gemetrix ships an update monthly, and Sherlock Holmes Detect monthly. Most recently, Gemetrix was updated on October 24, 2026 and Sherlock Holmes Detect on October 24, 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.*