# ShellMaster vs RCDD

The clearest difference is price: RCDD at Free against ShellMaster's $6.99. RCDD also leads on update cadence (every 6 days vs every 6 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

RCDD is free to download; ShellMaster costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ShellMaster ships an update every 6 weeks, RCDD every 6 days. The most recent releases landed on October 3, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | ShellMaster | RCDD |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rcdd-revision-bts-ndrc/id6763071555/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 6 days** |
| Monetization | — | Free |
| Size | 52 MB | 10 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SimTeCon GmbH](https://appshunter.io/developer/1761797043) | [Edgard REUX - Isiolyr](https://appshunter.io/developer/1895148928) |

## What reviewers say

### ShellMaster

[App page](https://appshunter.io/ios/app/shellmaster/id6740014632)

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

**In-app purchases:** none


### RCDD

[App page](https://appshunter.io/ios/app/rcdd-revision-bts-ndrc/id6763071555)

This app helps BTS NDRC students prepare for the E5 exam on Remote Customer Relations and Digitalization. It offers structured lessons, interactive quizzes, flashcards, and practical case studies. Track your progress with a personal dashboard and compete with other students.

**Highlights:** Structured course notes, Interactive quizzes with immediate correction, Flashcards with spaced repetition, Practical case studies (WordPress, PrestaShop), Timed mock exams, Personal progress dashboard, Offline mode

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

**In-app purchases:** none


## Frequently asked questions

### Is ShellMaster free?

ShellMaster costs $6.99, with no in-app purchases.

### Is RCDD free?

RCDD is free to download, with no in-app purchases.

### Do ShellMaster or RCDD have ads?

Neither ShellMaster nor RCDD shows ads.

### Which is updated more often, ShellMaster or RCDD?

ShellMaster ships an update every 6 weeks, and RCDD every 6 days. Most recently, ShellMaster was updated on October 3, 2026 and RCDD on October 15, 2026.

---

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