Comparison

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.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

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
Read full description

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

Learn Python in 21 Days4 screens
Stone Identifier4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 20, 2026 and August 19, 2026 respectively.

Scorecard4 real differences · 6 level
Learn Python in 21 Days versus Stone Identifier: the parameters behind the verdict, then further details
ParameterLearn Python in 21 DaysStone Identifier
PriceFreeFree
Rating4.5 (17 ratings)4.9 (52 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings1752 — better
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1512.0 — better
Further details — not scored
Size191 MB58 MB
Age rating4+4+
DeveloperAdam AtamniaCristian Alan Canales Mota

Customer experience

Learn Python in 21 Days

All ratings17 ratings
Positive88.2%
Neutral0.0%
Negative11.8%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Stone Identifier

All ratings52 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Learn Python in 21 Days

Subscriptions1
  • Monthly Full Access3 Days trial$9.991 Month
One-time1
  • Lifetime Full Access$19.99
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

Questions

Is Learn Python in 21 Days free?
Learn Python in 21 Days is free to download, with in-app purchases available.
Is Stone Identifier free?
Stone Identifier is free to download, with in-app purchases available.
Which has better reviews, Learn Python in 21 Days or Stone Identifier?
Stone Identifier is rated higher. Learn Python in 21 Days averages 4.5 out of 5 from 17 ratings, while Stone Identifier averages 4.9 from 52 ratings.
Do Learn Python in 21 Days or Stone Identifier have ads?
Neither Learn Python in 21 Days nor Stone Identifier shows ads.
Which is updated more often, Learn Python in 21 Days or Stone Identifier?
Learn Python in 21 Days ships an update every 2 months, and Stone Identifier every 2 months. Most recently, Learn Python in 21 Days was updated on September 20, 2026 and Stone Identifier on August 19, 2026.

Other comparisons