# Gamma Guru vs Gem Identifier

The clearest difference is price: Gem Identifier at Free against Gamma Guru's $3.99. Gamma Guru's advantage is rating (5.0 vs 1.0) and in-app purchases (none vs 2). On ratings volume, ads and device support there is nothing between them.

Gem Identifier is free to download; Gamma Guru costs $3.99 up front. Gem Identifier sells 2 in-app purchases, starting at $4.99 per 7 days. Gamma Guru asks for nothing beyond the download.

Gamma Guru holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Gamma Guru ships an update every 3 days, Gem Identifier every 9 months. The most recent releases landed on October 19, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Gamma Guru | Gem Identifier |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gamma-guru/id1610890905/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/gem-identifier-scanner/id6753644183/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 9 months |
| Monetization | Paid | **Freemium** |
| Size | 2 MB | 20 MB |
| Requires iOS | **15.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Matthew Kiser](https://appshunter.io/developer/1610890907) | [Saif Ullah Sajid](https://appshunter.io/developer/1527861472) |

## What reviewers say

### Gamma Guru

[App page](https://appshunter.io/ios/app/gamma-guru/id1610890905)

Access a comprehensive library of over 400 radioisotopes, view their gamma-ray data, and identify isotopes by their emitted gammas. Includes tools for radioactive decay and dose rate calculations.

**Highlights:** Extensive radioisotope library, Gamma-ray and branching ratio data, Isotope identification by gamma energy, Radioactive decay calculator, Dose rate calculator

**Features:** macOS Compatibility

**In-app purchases:** none


### Gem Identifier

[App page](https://appshunter.io/ios/app/gem-identifier-scanner/id6753644183)

Instantly identify gemstones, rocks, and minerals by taking a photo. This app uses advanced AI and a global database to provide detailed information about thousands of gems, helping you learn and build a personal collection.

**Highlights:** Instant AI-powered gem identification, Detailed information on gems and minerals, Create and manage a personal gem collection, High-precision image recognition, User-friendly interface, Offline access to saved results

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gemstone Identifier Pro Weekly | $4.99 | per 7 days |
| Gemstone Identifier Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is Gamma Guru free?

Gamma Guru costs $3.99, with no in-app purchases.

### Is Gem Identifier free?

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

### Which has better reviews, Gamma Guru or Gem Identifier?

Gamma Guru is rated higher. Gamma Guru averages 5.0 out of 5 from 2 ratings, while Gem Identifier averages 1.0 from 1 ratings.

### Do Gamma Guru or Gem Identifier have ads?

Neither Gamma Guru nor Gem Identifier shows ads.

### Which is updated more often, Gamma Guru or Gem Identifier?

Gamma Guru ships an update every 3 days, and Gem Identifier every 9 months. Most recently, Gamma Guru was updated on October 19, 2026 and Gem Identifier on October 12, 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.*