# System Design interview prep vs Blue Penguin Linux Prep

The clearest difference is price: System Design interview prep at Free against Blue Penguin Linux Prep's $1.99. Blue Penguin Linux Prep's advantage is rating (5.0 vs 1.0) and in-app purchases (none vs 5). On ratings volume, update cadence and device support there is nothing between them.

System Design interview prep is free to download; Blue Penguin Linux Prep costs $1.99 up front. System Design interview prep sells 5 in-app purchases, starting at $3.99 per 7 days. Blue Penguin Linux Prep asks for nothing beyond the download.

Blue Penguin Linux Prep holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

System Design interview prep ships an update monthly, Blue Penguin Linux Prep fortnightly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | System Design interview prep | Blue Penguin Linux Prep |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/system-design-interview-prep/id6756310915/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/blue-penguin-linux-prep/id6789564914/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 89 MB | 21 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Abdelhak El Moussaoui](https://appshunter.io/developer/1827690433) | [Leason Rykaart](https://appshunter.io/developer/1542598308) |

## What reviewers say

### System Design interview prep

[App page](https://appshunter.io/ios/app/system-design-interview-prep/id6756310915)

This app simulates system design interviews with an AI interrogator and interactive scenarios. Practice real-world architecture problems, receive instant feedback, and track your progress to ace your next tech interview.

**Highlights:** Interactive War Room for architecture scenarios, AI Interrogator challenges design decisions, Realistic system design interview questions, Daily practice drills for skill sharpening, Detailed performance analytics, Instant feedback and best practice learning

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access | $3.99 | per 7 days |
| Unlimited access | $4.99 | per 7 days |
| Unlimited access | $6.99 | per month |
| Unlimited access | $12.99 | per month |
| Unlimited access | $99.99 | per year |


### Blue Penguin Linux Prep

[App page](https://appshunter.io/ios/app/blue-penguin-linux-prep/id6789564914)

Prepare for the RHCSA 10 (EX200) exam with offline study materials, practice questions, and hands-on labs. Track your progress, maintain a practice streak, and set exam reminders. All your data is stored locally.

**Highlights:** Exam-focused study material, Practice multiple-choice questions, Hands-on labs with verification, Timed mock exams, Progress tracking and streaks, Personal notes and bookmarks, Offline access

**In-app purchases:** none


## Frequently asked questions

### Is System Design interview prep free?

System Design interview prep is free to download, with in-app purchases available.

### Is Blue Penguin Linux Prep free?

Blue Penguin Linux Prep costs $1.99, with no in-app purchases.

### Which has better reviews, System Design interview prep or Blue Penguin Linux Prep?

Blue Penguin Linux Prep is rated higher. System Design interview prep averages 1.0 out of 5 from 2 ratings, while Blue Penguin Linux Prep averages 5.0 from 1 ratings.

### Do System Design interview prep or Blue Penguin Linux Prep have ads?

System Design interview prep shows ads; Blue Penguin Linux Prep does not.

### Which is updated more often, System Design interview prep or Blue Penguin Linux Prep?

System Design interview prep ships an update monthly, and Blue Penguin Linux Prep fortnightly. Most recently, System Design interview prep was updated on October 30, 2026 and Blue Penguin Linux Prep on October 31, 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.*