Gamma Guru vs Gem Identifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gamma Guru
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.
- Extensive radioisotope library
- Gamma-ray and branching ratio data
- Isotope identification by gamma energy
- Radioactive decay calculator
- Dose rate calculator
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Gamma Guru provides fast, convenient access to a library of over 400 radioisotopes. Simply select an isotope of interest from the Isotope Library to view the associated gamma-rays and branching ratios and other information. Alternatively, enter up to three gamma-ray energies to see a list of isotopes that emit those gammas. Gamma Guru also includes radioactive decay and dose rate calculators.
Gem Identifier
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.
- 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
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Simply take a photo, and our advanced AI instantly analyzes and identifies the gemstone within seconds. With a vast global database and high-precision image recognition, you’ll receive detailed and reliable information about thousands of gems and crystals from around the world. Powerful Gem Scanner Technology Powered by advanced AI and gemology data, our gem scanner recognizes and classifies gemstones with exceptional accuracy. Say goodbye to guesswork — just snap, scan, and identify any gem effortlessly. Identify Precious Gems, Crystals & Minerals From dazzling diamonds to colorful sapphires, emeralds, and rare crystals, our gem identifier and crystal identifier tools provide in-depth details about every discovery. Learn about each gem’s type, hardness, origin, color variations, and even its estimated value. Learn & Build Your Gem Collection Save every gem you identify and create your personal gem collection inside the app. With your own digital gem library, you can easily track, categorize, and revisit your discoveries anytime — perfect for students, collectors, and jewelry enthusiasts who want to deepen their gem knowledge. Why Choose Gem Identifier & Scanner Instant gem identification using your phone’s camera Accurate AI-based detection for gems, crystals, and minerals High-quality visuals and educational gemology insights User-friendly interface suitable for beginners and professionals Offline access to your saved gemstone results anytime Perfect for Gem & Crystal Lovers Whether you’re visiting a jewelry store, exploring markets, or admiring gemstones in nature, take Gem Identifier & Scanner with you. Instantly identify every gem you encounter and reveal its story, origin, and properties. This all-in-one gem identification app helps you explore the world of gemstones and crystals like never before — right from your pocket. Download Gem Identifier & Scanner today and start your journey to becoming a gem expert, one beautiful discovery at a time! Terms of use: https://thepenguin.tech/legal/gemstone-identifier-terms-of-use.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Gamma Guru | Gem Identifier |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 1.0 (1 ratings) |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 3 days — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.2 — better | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthew Kiser | Saif Ullah Sajid |
Customer experience
Gamma Guru
Gem Identifier
In-app purchases
Gamma Guru
No in-app purchases
Gem Identifier
- Gemstone Identifier Pro Weekly$4.997 Days
- Gemstone Identifier Pro Yearly$19.991 Year






