# Scan21 vs Shell Keyboard

The clearest difference is review sentiment: Shell Keyboard at 100% against Scan21's 0%. Shell Keyboard also leads on rating (5.0 vs 2.3) and chart position (#1 vs #129). Scan21's advantage is ratings volume (3 vs 1) and iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Shell Keyboard holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 0% of Scan21's written reviews are positive against 100% of Shell Keyboard's.

## The numbers

| Metric | Scan21 | Shell Keyboard |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/scan21-age-id-check/id6751239834/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/shell-keyboard/id6811290737/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Monetization | Paid | Paid |
| Best chart rank | #129 | **#1** |
| Size | 22 MB | 3 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TelliSIM - Travel eSIM solutions](https://appshunter.io/developer/1747738958) | [Nguyen Nguyen](https://appshunter.io/developer/1071455830) |

## What reviewers say

### Scan21

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

**Currently charting:** #129 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


### Shell Keyboard

[App page](https://appshunter.io/ios/app/shell-keyboard/id6811290737)

**Currently charting:** #1 Top Paid · Developer Tools, #149 Top Grossing · Developer Tools (US App Store)

This custom keyboard provides essential terminal keys like Ctrl, Esc, and arrow keys that are missing from the default iOS keyboard. It offers customizable layouts for iPad and iPhone Duo, ensuring precise control for terminal applications.

**Highlights:** Dedicated terminal layer with Ctrl, Esc, Tab, arrows, Ctrl and Alt as proper modifiers, Full function-key layer (F1-F12), Customizable arrow key behavior, Return/Enter key options, Plain QWERTY and symbol layers, Seven themes with light/dark modes, 60% and 75% layouts for iPad/iPhone Duo

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Scan21 free?

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

### Is Shell Keyboard free?

Shell Keyboard costs $1.99, with no in-app purchases.

### Which has better reviews, Scan21 or Shell Keyboard?

Shell Keyboard is rated higher. Scan21 averages 2.3 out of 5 from 3 ratings, while Shell Keyboard averages 5.0 from 1 ratings.

### Do Scan21 or Shell Keyboard have ads?

Neither Scan21 nor Shell Keyboard shows ads.

### Which is more popular, Scan21 or Shell Keyboard?

Scan21 currently peaks at #129 in the App Store charts, and Shell Keyboard at #1. 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.*