# System Design interview prep vs Don't Break Prod

The clearest difference is in-app purchases: Don't Break Prod at none against System Design interview prep's 5. Don't Break Prod also leads on ads (none vs shown) and update cadence (weekly vs monthly). On price, device support and iOS requirement 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. Don't Break Prod asks for nothing beyond the download.

System Design interview prep ships an update monthly, Don't Break Prod weekly. The most recent releases landed on September 26, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | System Design interview prep | Don't Break Prod |
| --- | --- | --- |
| 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 | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 89 MB | 2 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Abdelhak El Moussaoui](https://appshunter.io/developer/1827690433) | [Hyung Min Kim](https://appshunter.io/developer/6799699518) |

## 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 |


### Don't Break Prod

[App page](https://appshunter.io/ios/app/dont-break-prod/id6802167581)

**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 Don't Break Prod free?

Don't Break Prod is free to download, with no in-app purchases.

### Do System Design interview prep or Don't Break Prod have ads?

System Design interview prep shows ads; Don't Break Prod does not.

### Which is updated more often, System Design interview prep or Don't Break Prod?

System Design interview prep ships an update monthly, and Don't Break Prod weekly. Most recently, System Design interview prep was updated on September 26, 2026 and Don't Break Prod on September 25, 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.*