Gemetrix vs Sherlock Holmes Detect
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gemetrix
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.
- UV illumination control (SWUV & LWUV)
- Adjustable exposure, ISO, color temperature, focus
- Side-by-side image comparison
- Image slider comparison
- Save labeled images
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This app allows control of your smartphone camera, using the same settings for both short-wave ultra-violet (SWUV) and long-wave ultra-violet (LWUV) illuminations. The controlled settings are for exposure, ISO, color temperature and focus. The two images can then be compared either through alternating views or using a slider. Images with SW and LW labeling can be saved to your image gallery.
Sherlock Holmes Detect
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.
- Connects to SH box
- Bluetooth/cable connectivity
- Diamond image analysis
- Distinguishes natural vs. lab-grown diamonds
- Multiple illumination settings
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This app connects your phone to an SH box (purchased separately). Using Bluetooth or cable, the App gives a series of commands to the box. It takes pictures of diamonds and diamond jewelry under different illuminations and analyzes the pictures. The end result enables the user to distinguish between natural diamonds and lab-grown diamonds.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Gemetrix | Sherlock Holmes Detect |
|---|---|---|
| Price | Free | Free |
| Rating | 2.2 (5 ratings) | 3.7 (7 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 5 | 7 — better |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 10.3 — better | 14.0 |
| Further details — not scored | ||
| Size | 18 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | John Chapman | Mejix |
Customer experience
Gemetrix
Sherlock Holmes Detect
In-app purchases
Gemetrix
No in-app purchases
Sherlock Holmes Detect
No in-app purchases
Questions
Is Gemetrix free?
Is Sherlock Holmes Detect free?
Which has better reviews, Gemetrix or Sherlock Holmes Detect?
Do Gemetrix or Sherlock Holmes Detect have ads?
Which is updated more often, Gemetrix or Sherlock Holmes Detect?
Other comparisons
