# System Design interview prep vs SkillGaps

The clearest difference is ads: SkillGaps at none against System Design interview prep's shown. SkillGaps also leads on update cadence (weekly vs monthly). System Design interview prep's advantage is iOS requirement (17.6 vs 26.2). On price, in-app purchases 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 and SkillGaps sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

System Design interview prep ships an update monthly, SkillGaps weekly. The most recent releases landed on July 23, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | System Design interview prep | SkillGaps |
| --- | --- | --- |
| 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 | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 89 MB | 13 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Abdelhak El Moussaoui](https://appshunter.io/developer/1827690433) | [Vladislav Aliev](https://appshunter.io/developer/1871109100) |

## 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 |


### SkillGaps

[App page](https://appshunter.io/ios/app/skillgaps/id6764306420)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkillGaps Pro | $9.99 | per month |
| SkillGaps Pro | $59.99 | per year |


## Frequently asked questions

### Is System Design interview prep free?

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

### Is SkillGaps free?

SkillGaps is free to download, with in-app purchases available.

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

System Design interview prep shows ads; SkillGaps does not.

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

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

---

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