# Flutter Builder vs Scan21

The clearest difference is review sentiment: Flutter Builder at 100% against Scan21's 0%. Scan21's advantage is price ($1.99 vs $3.99). On ads, in-app purchases, monetization model and chart position there is nothing between them.

Flutter Builder costs $3.99 and Scan21 $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Flutter Builder | Scan21 |
| --- | --- | --- |
| Price | $3.99 | **$1.99** |
| Rating | — | **[2.3 (3 ratings)](https://appshunter.io/ios/app/scan21-age-id-check/id6751239834/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | Paid | Paid |
| Best chart rank | **#105** | #138 |
| Size | 58 MB | 22 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [上海烨鑫信息科技有限公司](https://appshunter.io/developer/1490375523) | [TelliSIM - Travel eSIM solutions](https://appshunter.io/developer/1747738958) |

## What reviewers say

### Flutter Builder

[App page](https://appshunter.io/ios/app/flutter-builder/id6504612819)

**Currently charting:** #105 Top Paid · Developer Tools (US App Store)

This visual development tool simplifies app creation for Flutter developers. It offers an intuitive graphical programming interface, making it accessible for both beginners and experienced professionals to build applications quickly.

**Highlights:** Visual development environment, Graphical programming pattern, Intuitive interface, Rapid application building, Suitable for beginners and professionals

**Features:** Vision Pro support

**In-app purchases:** none


### Scan21

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

**Currently charting:** #138 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 Flutter Builder free?

Flutter Builder costs $3.99, with no in-app purchases.

### Is Scan21 free?

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

### Do Flutter Builder or Scan21 have ads?

Neither Flutter Builder nor Scan21 shows ads.

### Which is more popular, Flutter Builder or Scan21?

Flutter Builder currently peaks at #105 in the App Store charts, and Scan21 at #138. 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.*