FaultKin Mobile vs Rock & Crystal Identifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FaultKin Mobile
This app allows geologists to collect, visualize, and analyze fault slip data directly from their mobile device. It offers both automatic data entry using device orientation and manual input options, with features for grouping data and performing basic calculations.
- Automatic data entry via device orientation
- Manual data entry via stereonet or text fields
- Group faults with custom tags
- Perform basic calculations (rotations, unfolding)
- Plot P and T axes, moment tensor axes
- View plots from any orientation
- Stamp entries with time, date, and location
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FaultKin Mobile is designed to help you collect, visualize, and analyze fault slip data on the go. It is a companion to my FaultKin program for desktop computers, but it can also be used to measure faults on the outcrop. The app has the following features: - Provide automatic data entry as a geologist's compass by reading the iOS device orientation and converting it to strike and dip of planes and/or trend and plunge of lines. - Provide manual data entry via either tapping and dragging on the stereonet or by typing values into text fields. - Groups of faults can be assigned different tags. You will probably want to do this based on location or other criteria. For example, you may want to have a tag labeled "Corral Quemado-Older" and anther "Corral Quemado-Younger". - Carry out basic calculations such as: rotations about any axis, unfolding faults around local bedding, or measure angles between lines and between planes. - Plot P and T axes, (unweighted) moment tensor axes, P-T dihedra, fault plane solutions, and contour P and T axes. - View the plots from any orientation, not just looking straight down into the lower hemisphere - Stamp each entry with time date and, if enabled by the user, location. See the location of a datum in the iOS Maps program - Provide basic input and output of data using standard iOS conventions - Work on both iPhones or iPads, both in portrait mode only. The desktop version of FaultKin will soon be updated so that it can read and write FaultKin Mobile files, which are simple tab separated text files. Use it at your own risk. In particular, recall that your iOS device is very sensitive to magnetic fields and the compass bearings can easily be off by 10-20°! This program should not be used as a sole source of navigation data. The author assumes no responsibility for incorrect results, unanticipated behaviors, loss resulting from results provided by the program, or any other anticipated or unanticipated event related to the program.
Rock & Crystal Identifier
Identify rocks, minerals, crystals, and gems instantly by taking a photo. Access a comprehensive database with detailed information, educational content, and fun facts about geology and gemology. Perfect for hobbyists, students, and anyone curious about the natural world.
- Instant photo identification
- Comprehensive rock and gem database
- Detailed specimen information
- Educational geology content
- User-friendly interface
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Uncover the hidden treasures of the Earth with Rock & Crystal Identifier: Gem! Whether you're a budding geologist, a student, or just curious about the natural world, our app makes identifying rocks, minerals, crystals, and gems effortless and exciting. Simply take a photo, and our advanced AI technology will analyze its features to provide you with detailed information, including its name, type, and properties. Key Features of Rock & Crystal Identifier: Gem Instant Identification: Snap a photo and get instant results with high accuracy. Comprehensive Database: Access a vast database of rocks, minerals, crystals, and gems. Detailed Descriptions: Learn about each specimen’s composition, formation, and uses. Educational Content: Dive deeper with articles and fun facts about geology and gemology. User-friendly Interface: Enjoy a seamless experience with our intuitive design. Perfect for hobbyists, educators, and professionals, Rock & Crystal Identifier: Gem by Photo transforms your smartphone into a powerful tool for exploring the natural world. Start your geological adventure today and uncover the secrets of the Earth with every photo you take! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: FaultKin Mobile at none against Rock & Crystal Identifier's 3. FaultKin Mobile also leads on rating (5.0 vs 4.8) and update cadence (every 2 months vs every 3 months). Rock & Crystal Identifier's advantage is ratings volume (29 vs 2). On price, 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
Both are free to download. Rock & Crystal Identifier sells 3 in-app purchases, starting at $6.99 per 7 days. FaultKin Mobile asks for nothing beyond the download.
FaultKin Mobile holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Rock & Crystal Identifier has 29 ratings behind it against 2, so its average is the more settled of the two.
FaultKin Mobile ships an update every 2 months, Rock & Crystal Identifier every 3 months. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.
| Parameter | FaultKin Mobile | Rock & Crystal Identifier |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.8 (29 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 2 | 29 — better |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 28 MB | 106 MB |
| Age rating | 4+ | 4+ |
| Developer | Richard Allmendinger | Bhavinkumar Satashiya |
Customer experience
FaultKin Mobile
Rock & Crystal Identifier
In-app purchases
FaultKin Mobile
No in-app purchases
Rock & Crystal Identifier
- Weekly Subscription$6.997 Days
- Monthly Subscription$17.991 Month
- Yearly Subscription$49.991 Year
Questions
Is FaultKin Mobile free?
Is Rock & Crystal Identifier free?
Which has better reviews, FaultKin Mobile or Rock & Crystal Identifier?
Do FaultKin Mobile or Rock & Crystal Identifier have ads?
Which is updated more often, FaultKin Mobile or Rock & Crystal Identifier?
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