Comparison

Stone Identifier vs Mental Math Exercises

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

Head to head
About

Stone Identifier

Instantly identify gemstones, rocks, and minerals using your camera or photo library with advanced AI. Explore detailed information, learn about birthstones, and use a magnetic sensor to detect specific materials. An AI chat assistant provides deeper insights into your discoveries.

Highlights
  • Instant AI-powered identification
  • Detailed rock and mineral data
  • Birthstone information
  • AI chat assistance
  • Magnetic sensor for detection
  • User-friendly interface
Features
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Use your camera or photo library to instantly identify gemstones, rocks and minerals with advanced AI technology. Snap a photo of any gemstone, rock or mineral and get an instant accurate identification. The Stone Identifier: Gemalyze app makes it simple for anyone to quickly analyze and explore the unique characteristics of various stones. Whether you're a geologist, mineral explorer, hobbyist, student, teacher, or simply curious to expand your understanding of rocks, the Stone Identifier: Gemalyze delivers the easiest and most comprehensive guide with clear instructions. Features : * Instant Identification: Simply take a picture, and Rock Identifier quickly analyzes the visual characteristics like color, texture, patterns, and inclusions to identify the gemstone or rock. * Birthstones Section: Learn about each month's gemstone, its history, symbolism, and properties. * AI Chat Assistance: Engage with our AI assistant to dive deeper into details. Ask questions about gemstones properties, origin, uses, and care. * Magnetic Sensor: Detect magnetized rocks and minerals—like magnetite or meteorites—as well as metals primarily composed of iron, cobalt, or nickel. * More Information: Access detailed data about the rocks and minerals you discover, including chemical formulas, hardness, origins, and other intriguing facts, so you can fully understand and evaluate your finds. * User-Friendly Interface: A sleek and intuitive interface that makes it easy to upload images, browse results, and interact with the AI chat assistant. Subscriptions: Subscribe to Premium to get unlimited access to special app features: Subscriptions are billed weekly or annually at the rate depending on the subscription plan. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. For a detailed breakdown of our subscription options, including how to manage or cancel your subscription, please visit our Privacy Policy and Terms of Service pages: https://stoneidentifier.me/terms https://stoneidentifier.me/privacy Discover, study, and document your geological surroundings! With Stone Identifier: Gemalyze, you can capture photos to identify rocks, dive into the geologic record and track your journey through Earth's history.

About

Mental Math Exercises

Features
Read full description

This is a math practice app designed for primary school students, which aims to help children improve their math calculation ability and cultivate their interest in learning through gamification. Daily Practice: unlimited questions to practice, support horizontal and vertical random questions Basic Practice: includes horizontal, vertical and continuous operations Wrong Question Book: automatically record wrong questions for easy review Practice Record: record daily practice, including statistical charts Difficulty Level: Calculation within 10: suitable for kindergarten senior class Calculation within 20: suitable for the first semester of grade 1 Calculation within 100: suitable for the second semester of grade 1 Practice Type: Horizontal Practice: addition, subtraction, mixed operations Vertical Practice: addition, subtraction, mixed operations Continuous Operation: continuous addition and subtraction of three numbers Interactive Features: Each correct answer has a flower animation encouragement Supports horizontal and vertical input methods Clear progress and score display Intuitive place value marking (ones, tens, hundreds) Data Statistics: Record the number of questions completed daily Statistical accuracy Practice time record Visual practice data

Screenshots

Stone Identifier4 screens
Mental Math Exercises3 screens

Verdict

The call

The clearest difference is price: Stone Identifier at Free against Mental Math Exercises's $0.29. Stone Identifier also leads on iOS requirement (12.0 vs 17.6). Mental Math Exercises's advantage is in-app purchases (none vs 5). On update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Stone Identifier is free to download; Mental Math Exercises costs $0.29 up front. Stone Identifier sells 5 in-app purchases, starting at $4.99 per 7 days. Mental Math Exercises asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 7 level
Stone Identifier versus Mental Math Exercises: the parameters behind the verdict, then further details
ParameterStone IdentifierMental Math Exercises
PriceFree — better$0.29
Rating4.9 (54 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings54 — better—
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.6
Further details — not scored
Size58 MB1 MB
Age rating4+4+
DeveloperPicture Vision Studio LLC仁超 张

In-app purchases

5 purchases

Stone Identifier

Subscriptions4
  • Premium3 Days trial$4.997 Days
  • Premium$24.991 Year
  • Premium1 Month trial$29.991 Year
Show 1 more
  • Premium7 Days trial$39.991 Year
One-time1
  • Premium Lifetime$49.99
None

Mental Math Exercises

No in-app purchases

Questions

Is Stone Identifier free?
Stone Identifier is free to download, with in-app purchases available.
Is Mental Math Exercises free?
Mental Math Exercises costs $0.29, with no in-app purchases.
Do Stone Identifier or Mental Math Exercises have ads?
Neither Stone Identifier nor Mental Math Exercises shows ads.
Which is updated more often, Stone Identifier or Mental Math Exercises?
Stone Identifier ships an update every 2 months, and Mental Math Exercises every 2 months. Most recently, Stone Identifier was updated on October 24, 2026 and Mental Math Exercises on October 25, 2026.

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