Comparison

Rockd vs Stone Identifier

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Rockd

Discover and document the geology around you. Access global geologic maps, 3D globes, and detailed summaries of your surroundings. Contribute your own observations and track your exploration of Earth's geologic history.

Highlights
  • Interactive global geologic maps
  • 3D virtual globe exploration
  • Field observation logging
  • Offline map caching
  • Paleogeographic map access
  • Stratigraphic column viewing
  • Geologic literature integration
Features
Read full description

Explore, learn about, and document your geologic surroundings! Whether you are a professional geoscientist or curious about the rocks around you and the stories they tell, Rockd allows you to explore and learn about the geologic record, contribute your own observations, and log your journey through the geologic record. Features: - Instant access to geologic and geographic summaries of your current location via a Dashboard - Interactive global access to more than 290 geologic maps, with more being added weekly - Explore the landscape with a dynamic, 3D virtual globe - Save maps for use in the field with a built-in map caching system - See your past location and explore paleogeographic maps from C.R. Scotese and GPlates - View Macrostrat stratigraphic columns where available (beta) - Explore published literature containing mentions of mapped geologic units (when available) via xDD (formerly, GeoDeepDive) - Elevation data for most points on Earth from digital elevation models (DEMs) - Add your own field observations even offline; tag features from Macrostrat and the Paleobiology Database - Record strike/dip or trend/plunge for geologic features, using your phone's compass - Track your progress through the geologic record privately, or share it with others - See the public activity of other users and share your own and other public checkins using unique URLs Rockd is produced by the Macrostrat lab in the Department of Geoscience at the University of Wisconsin - Madison. Support provided by the National Science Foundation (NSF) and the Dept. of Geoscience. Experiencing issues? Send an email to contact@rockd.org and we will do our best to help you resolve it.

About

Stone Identifier

Identify rocks, minerals, and crystals from photos with high accuracy. Explore their properties, discover nearby deposits on a map, and build your own digital collection. Learn fascinating facts about stones from around the world.

Highlights
  • Accurate rock identification from photos
  • Study physical and chemical properties
  • Discover nearby rock deposits on a map
  • Create and manage a personal rock collection
  • Learn about thousands of rock types
Features
Read full description

Have you encountered a rock and you don’t know what it is? Maybe you want to learn more about it, minerals or any crystal? Rock Seeker is the ultimate app to help you identify and study more about thousands of rocks from all over the world. How does it work? Rock Seeker identifies the rock in your camera shot or photo with the utmost accuracy. Our app has a comprehensive, easy to browse interface that helps you study the rock, understand its physical and chemical properties too. It’s also possible to add the rock to your rock collection. You can see possible location of every rock you found or just browsing with convenient map showing deposits nearby. Learn more about rocks fast and easy Rock Seeker makes it very easy to analyze and study any rock you own, but you can also explore trendy stone or discover cool facts about them. It’s always exciting to learn about rocks and all kinds of cool stones, and with Rock Seeker you can do that fast and easy. Immerse yourself into the world of extraordinary rocks and educate yourself about them. Features: Analyze and study thousands of rock types Search it on the map and find deposits nearby Very accurate rock identification engine Create your own rock collection Subscription pricing and terms: RockSeeker offers the following auto-renewing subscriptions to provide you with unlimited access to identification and database within RockSeeker Platinum while you maintain an active subscription: Weekly with a 3-day trial at $4.99; Weekly at $4.99; Monthly with a 3-day trial at 9.99; Monthly at $9.99; Yearly with 3-day trial at 29.99, Yearly at $29.99. For other currencies, the price corresponds to the same price tier on the App Store Pricing Matrix. Payment will be charged to the credit card connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period, and the cost of the renewal will be identified. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after the purchase. Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable. If you have any questions or suggestions on how we can improve the application, please do not hesitate to contact us. Read more about our terms and conditions here: Privacy Policy: https://docs.appsx.lv/policies/privacy-policy Terms of Use: https://docs.appsx.lv/policies/terms-of-use

Screenshots

Rockd4 screens
Stone Identifier4 screens

Verdict

The call

Rockd and Stone Identifier both sit at 4.4 stars, but that hides the real split: 73% of Rockd's written reviews are positive against 16% of Stone Identifier's. Rockd also leads on in-app purchases (none vs 10) and ads (none vs shown). Stone Identifier's advantage is update cadence (every 4 weeks vs every 3 months) and ratings volume (1.5K vs 185). On price, rating, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Stone Identifier sells 10 in-app purchases, starting at $4.99 per 7 days. Rockd asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Rockd against 4.4 for Stone Identifier. That said, the two scores are not equally well evidenced: Stone Identifier has 1.5K ratings behind it against 185, so its average is the more settled of the two. Written reviews are what separate them: 73% of Rockd's written reviews are positive against 16% of Stone Identifier's.

UpkeepUpdate frequency

Rockd ships an update every 3 months, Stone Identifier every 4 weeks. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

Scorecard6 real differences · 4 level
Rockd versus Stone Identifier: the parameters behind the verdict, then further details
ParameterRockdStone Identifier
PriceFreeFree
Rating4.4 (185 ratings)4.4 (1.5K ratings)
Positive reviews73.3% of reviews — better15.9% of reviews
Number of ratings1851.5K — better
Update frequencyEvery 3 monthsEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.616.0 — better
Further details — not scored
Size259 MB186 MB
Age rating4+4+
DeveloperUniversity of Wisconsin-Madison Shared AppsApp Holdings

Customer experience

Rockd

All ratings185 ratings
Positive82.2%
Neutral7.6%
Negative10.3%
Written reviews90 reviews
Positive73.3%
Neutral13.3%
Negative13.3%

Stone Identifier

All ratings1,542 ratings
Positive85.2%
Neutral4.5%
Negative10.3%
Written reviews226 reviews
Positive15.9%
Neutral0.9%
Negative83.2%

User reviews

Rockd

From 185 App Store ratings

What we love

  • 🗺️ Comprehensive geological maps with detailed information
  • 💡 Innovative integration of peer-reviewed references and literature
  • 🧭 Built-in Brunton compass and clinometer tools
  • 📱 User-friendly interface and intuitive navigation
  • 🌍 Global coverage with paleomaps and stratigraphic data

Room to improve

  • 🐛 Black map display issues in offline and online modes
  • 📍 GPS tracking and real-time position updates failing
  • 🔌 Offline functionality severely limited or broken
  • 🔐 Persistent login requirement without password saving
  • ⚠️ Error dialogs that won't dismiss

Stone Identifier

From 1.5K App Store ratings

What we love

  • 🤗 Helpful for identifying rocks and minerals
  • 🧠 Informative details on specimens
  • 👨‍🏫 Educational for students and kids

Room to improve

  • 🤷‍♂️ Inconsistent and inaccurate identification results
  • 💰 Expensive subscription model
  • 🔒 Difficult to cancel subscription
  • 🙅‍♀️ Limited free usage
  • 🤖 Feels like an automated response rather than a knowledgeable app

Bugs and requests

Rockd

Reported bugs

17 issues
  • Black map display in airplane mode and online
  • Persistent error dialogs that cannot be dismissed
  • GPS not tracking in real-time
  • Offline check-ins not syncing properly
  • Sign-up page jumps between fields and login page
Show 12 more
  • Fossils button not working
  • Map returns to user location after viewing check-ins
  • App crashes and becomes unresponsive
  • Data loss after app reinstall or logout
  • Maps fail to load after recent updates
  • Location search functionality broken
  • Android version windows not visible
  • Straight lines appear when zooming
  • Formations stop at state lines
  • Check-in screen stuck with no exit option
  • App won't load after initial use
  • Geological overlay won't upload to base map

Requested features

16 requests
  • Follow/friend mechanic to track other users' check-ins
  • Rock identification tool from photo uploads
  • Offline map download with customizable zoom levels
  • Stereonet tool for structural geology
  • Groundwater/aquifer information section
Show 11 more
  • Map legend/key for geological features
  • Spanish language support
  • Ability to move dashboard to different locations
  • Latitude/longitude search functionality
  • Multiple photo attachments per location
  • Strike and dip data visualization
  • Fault line labeling on maps
  • Better Android version compatibility
  • Tutorial or short course for advanced features
  • Black contact lines between formations toggle
  • Personal photo upload focus with mineral variations

Stone Identifier

Reported bugs

3 issues
  • App crashes or freezes during use
  • Server connection issues prevent identification
  • Incorrect or nonsensical identification results

Requested features

4 requests
  • Allow manual rock/mineral identification input
  • Provide more detailed information on each specimen
  • Improve accuracy of identification algorithms
  • Offer a one-time purchase option instead of subscription

In-app purchases

None

Rockd

No in-app purchases

10 purchases

Stone Identifier

Subscriptions10
  • RockPlatinum Weekly$4.997 Days
  • RockPlatinum Weekly with Trial3 Days trial$4.997 Days
  • RockPlatinum Weekly with Trial3 Days trial$5.997 Days
Show 7 more
  • RockPlatinum Weekly$5.997 Days
  • RockPlatinum Weekly 7day Trial7 Days trial$5.997 Days
  • RockPlatinum Monthly Access$9.991 Month
  • RockPlatinum Monthly + Trial3 Days trial$9.991 Month
  • Rock Seeker Platinum Annual$29.991 Year
  • RockPlatinum Annual 3day Trial3 Days trial$29.991 Year
  • Rock Seeker Platinum Annual$39.991 Year

Questions

Is Rockd free?
Rockd is free to download, with no in-app purchases.
Is Stone Identifier free?
Stone Identifier is free to download, with in-app purchases available.
Which has better reviews, Rockd or Stone Identifier?
Rockd and Stone Identifier are both rated 4.4 out of 5 on the App Store, from 185 and 1.5K ratings respectively.
Do Rockd or Stone Identifier have ads?
Stone Identifier shows ads; Rockd does not.
Which is updated more often, Rockd or Stone Identifier?
Rockd ships an update every 3 months, and Stone Identifier every 4 weeks. Most recently, Rockd was updated on September 18, 2026 and Stone Identifier on September 23, 2026.

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