Learn Python in 21 Days vs Stone Identifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Learn Python in 21 Days
Master Python programming with interactive lessons covering variables, data types, loops, functions, and more. Practice coding directly within the app and explore advanced topics like error handling and object-oriented programming.
- Variables, indentation, and comments
- Data types: int, float, str, bool, list, tuple, set, dict
- Control flow: conditions and loops
- Functions and modules
- Error handling and class basics
- In-app coding practice
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Note: Screenshots may not reflect the final version of the app. Get Excited! Here is what you learn (subject to modification): - Introduction: Learn variables, indentation, and comments. - Data Types: Explore int, float, str, bool, list, tuple, set, dict. - Numbers: Work with integers, floats, and arithmetic operations. - Conditions: if, else, elif, boolean values, comparison, and logical operators. - Strings: String manipulation, concatenation, indexing, and slicing. - Lists and Tuples: Learn list operations, immutability in tuples, and common methods. - Loops: Use for loops, while loops, and the range() function. - Sets: Understand set properties and perform union, intersection, and difference. - Dictionaries: Work with key-value pairs and common dictionary methods. - Functions: Define functions, use arguments, return values, and lambda functions. - Modules: Import libraries like math and random. - Error Handling: Handle exceptions using try, except, and finally. - Class Basics: Learn basic object-oriented programming, classes, and objects.
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.
- Instant AI-powered identification
- Detailed rock and mineral data
- Birthstone information
- AI chat assistance
- Magnetic sensor for detection
- User-friendly interface
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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.
Screenshots
Verdict
The clearest difference is review sentiment: Stone Identifier at 100% against Learn Python in 21 Days's 0%. Stone Identifier also leads on rating (4.9 vs 4.5) and ratings volume (52 vs 17). On price, update cadence, ads and in-app purchases 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. Learn Python in 21 Days sells 2 in-app purchases, starting at $9.99 per month and Stone Identifier sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Stone Identifier holds the better App Store score, 4.9 against 4.5. Both are backed by a comparable volume of ratings — 17 and 52 respectively. Written reviews point the same way: 0% of Learn Python in 21 Days's written reviews are positive against 100% of Stone Identifier's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 20, 2026 and August 19, 2026 respectively.
| Parameter | Learn Python in 21 Days | Stone Identifier |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (17 ratings) | 4.9 (52 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 17 | 52 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15 | 12.0 — better |
| Further details — not scored | ||
| Size | 191 MB | 58 MB |
| Age rating | 4+ | 4+ |
| Developer | Adam Atamnia | Cristian Alan Canales Mota |
Customer experience
Learn Python in 21 Days
Stone Identifier
In-app purchases
Learn Python in 21 Days
- Monthly Full Access3 Days trial$9.991 Month
- Lifetime Full Access$19.99
Stone Identifier
- Premium3 Days trial$4.997 Days
- Premium$24.991 Year
- Premium1 Month trial$29.991 Year
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- Premium7 Days trial$39.991 Year
- Premium Lifetime$49.99
Questions
Is Learn Python in 21 Days free?
Is Stone Identifier free?
Which has better reviews, Learn Python in 21 Days or Stone Identifier?
Do Learn Python in 21 Days or Stone Identifier have ads?
Which is updated more often, Learn Python in 21 Days or Stone Identifier?
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