# SQL Practice vs Scan21

The clearest difference is review sentiment: SQL Practice at 85% against Scan21's 0%. SQL Practice also leads on price (Free vs $1.99) and rating (4.7 vs 2.3). Scan21's advantage is in-app purchases (none vs 2) and chart position (#27 vs #95). On ads, device support and iOS requirement there is nothing between them.

SQL Practice is free to download; Scan21 costs $1.99 up front. SQL Practice sells 2 in-app purchases, starting at $3.99 per 7 days. Scan21 asks for nothing beyond the download.

SQL Practice holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: SQL Practice has 137 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 85% of SQL Practice's written reviews are positive against 0% of Scan21's.

## The numbers

| Metric | SQL Practice | Scan21 |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.7 (137 ratings)](https://appshunter.io/ios/app/sql-practice-learn-database/id6749337619/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/scan21-age-id-check/id6751239834/reviews) |
| Number of ratings | **137** | 3 |
| Positive reviews | **85.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | — |
| Monetization | **Free** | Paid |
| Best chart rank | #95 | **#27** |
| Size | 48 MB | 22 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Marton Greber](https://appshunter.io/developer/1748728717) | [TelliSIM - Travel eSIM solutions](https://appshunter.io/developer/1747738958) |

## What reviewers say

### SQL Practice

[App page](https://appshunter.io/ios/app/sql-practice-learn-database/id6749337619)

**Currently charting:** #95 Top Free · Developer Tools, #172 Top Grossing · Developer Tools (US App Store)

Master SQL with short, daily interactive sessions. Practice real-world queries and datasets on your phone to build confidence for career changes, professional development, or technical interviews. Learn database concepts and advanced techniques at your own pace.

**Highlights:** 15-minute daily learning sessions, Interactive exercises with real-world datasets, Progressive curriculum from beginner to advanced, Instant feedback and mistake analysis, Gamified progress tracking (streaks, XP, achievements), Master SELECT, JOINs, aggregations, and subqueries

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access | $3.99 | per 7 days |
| Pro Access | $19.99 | per year |


### Scan21

[App page](https://appshunter.io/ios/app/scan21-age-id-check/id6751239834)

**Currently charting:** #27 Top Paid · Developer Tools (US App Store)

Quickly verify if individuals meet the 21+ age requirement by scanning the barcode on their ID. Get instant visual and audio feedback for eligibility. Works offline and tracks scan history.

**Highlights:** Scan ID barcodes with device camera, Automatic age calculation for 21+, Clear visual (green/red screen) feedback, Optional audio alerts, Scan history and statistics, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SQL Practice free?

SQL Practice is free to download, with in-app purchases available.

### Is Scan21 free?

Scan21 costs $1.99, with no in-app purchases.

### Which has better reviews, SQL Practice or Scan21?

SQL Practice is rated higher. SQL Practice averages 4.7 out of 5 from 137 ratings, while Scan21 averages 2.3 from 3 ratings.

### Do SQL Practice or Scan21 have ads?

Neither SQL Practice nor Scan21 shows ads.

### Which is more popular, SQL Practice or Scan21?

SQL Practice currently peaks at #95 in the App Store charts, and Scan21 at #27. Chart position reflects recent download velocity rather than total install base.

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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.*