# Tech Interview Prep vs System Design Refresher

The clearest difference is update cadence: Tech Interview Prep at daily against System Design Refresher's monthly. Tech Interview Prep also leads on iOS requirement (15.1 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Tech Interview Prep ships an update daily, System Design Refresher monthly. The most recent releases landed on September 7, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Tech Interview Prep | System Design Refresher |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Monthly |
| Size | 25 MB | 18 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Aman Navani](https://appshunter.io/developer/1866204326) | [Saurabh Sharma](https://appshunter.io/developer/1883599017) |

## What reviewers say

### Tech Interview Prep

[App page](https://appshunter.io/ios/app/tech-interview-prep/id6757340798)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Tech Interview Prep free?

Tech Interview Prep is free to download, with no in-app purchases.

### Is System Design Refresher free?

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

### Do Tech Interview Prep or System Design Refresher have ads?

Neither Tech Interview Prep nor System Design Refresher shows ads.

### Which is updated more often, Tech Interview Prep or System Design Refresher?

Tech Interview Prep ships an update daily, and System Design Refresher monthly. Most recently, Tech Interview Prep was updated on September 7, 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.*