# System Design interview prep vs System Design Refresher

The clearest difference is in-app purchases: System Design Refresher at none against System Design interview prep's 5. System Design Refresher also leads on ads (none vs shown). System Design interview prep's advantage is iOS requirement (17.6 vs 26.2). On price, update cadence and device support there is nothing between them.

Both are free to download. System Design interview prep sells 5 in-app purchases, starting at $3.99 per 7 days. System Design Refresher asks for nothing beyond the download.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on July 23, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | System Design interview prep | System Design Refresher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/system-design-interview-prep/id6756310915/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 89 MB | 18 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Abdelhak El Moussaoui](https://appshunter.io/developer/1827690433) | [Saurabh Sharma](https://appshunter.io/developer/1883599017) |

## 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 |


### System Design Refresher

[App page](https://appshunter.io/ios/app/system-design-refresher/id6760277935)

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

**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 System Design Refresher free?

System Design Refresher is free to download, with no in-app purchases.

### Do System Design interview prep or System Design Refresher have ads?

System Design interview prep shows ads; System Design Refresher does not.

### Which is updated more often, System Design interview prep or System Design Refresher?

System Design interview prep ships an update monthly, and System Design Refresher monthly. Most recently, System Design interview prep was updated on July 23, 2026 and System Design Refresher on September 12, 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.*