# Learn Python in 21 Days vs Stone Identifier

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.

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.

## The numbers

| Metric | Learn Python in 21 Days | Stone Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (17 ratings)](https://appshunter.io/ios/app/learn-python-in-21-days/id6737173957/reviews) | **[4.9 (52 ratings)](https://appshunter.io/ios/app/stone-identifier-gemalyze/id6738392969/reviews)** |
| Number of ratings | 17 | **52** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 191 MB | 58 MB |
| Requires iOS | 15 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Adam Atamnia](https://appshunter.io/developer/1775084049) | [Cristian Alan Canales Mota](https://appshunter.io/developer/1573119875) |

## What reviewers say

### Learn Python in 21 Days

[App page](https://appshunter.io/ios/app/learn-python-in-21-days/id6737173957)

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:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Full Access | $9.99 | per month |
| Lifetime Full Access | $19.99 | one-time |


### Stone Identifier

[App page](https://appshunter.io/ios/app/stone-identifier-gemalyze/id6738392969)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per 7 days |
| Premium | $24.99 | per year |
| Premium | $29.99 | per year |
| Premium | $39.99 | per year |
| Premium Lifetime | $49.99 | one-time |


## Frequently asked 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.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*