# System Design Refresher vs Hello Interview

The clearest difference is in-app purchases: System Design Refresher at none against Hello Interview's 3. Hello Interview's advantage is update cadence (every 6 days vs monthly) and iOS requirement (16.4 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. Hello Interview sells 3 one-off in-app purchases. System Design Refresher asks for nothing beyond the download.

System Design Refresher ships an update monthly, Hello Interview every 6 days. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | System Design Refresher | Hello Interview |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (33 ratings)](https://appshunter.io/ios/app/hello-interview/id6806752897/reviews)** |
| Number of ratings | — | **33** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 18 MB | 53 MB |
| Requires iOS | 26.2 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Saurabh Sharma](https://appshunter.io/developer/1883599017) | [Optick Labs Inc. dba Hello Interview](https://appshunter.io/developer/6806752899) |

## What reviewers say

### System Design Refresher

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

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

**In-app purchases:** none


### Hello Interview

[App page](https://appshunter.io/ios/app/hello-interview/id6806752897)

Prepare for software engineering interviews with structured learning paths, practical guides, and interactive quizzes. Gain confidence in system design, data structures, algorithms, and behavioral questions. Access real interview experiences and community insights.

**Highlights:** Structured learning paths, Practical interview guides, Interactive quizzes, Real interview questions, Community discussions, Progress tracking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hello Interview Premium – 1 Month | $47.99 | one-time |
| Hello Interview Premium – 1 Year | $89.99 | one-time |
| Hello Interview Premium – Lifetime | $299.99 | one-time |


## Frequently asked questions

### Is System Design Refresher free?

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

### Is Hello Interview free?

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

### Do System Design Refresher or Hello Interview have ads?

Neither System Design Refresher nor Hello Interview shows ads.

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

System Design Refresher ships an update monthly, and Hello Interview every 6 days. Most recently, System Design Refresher was updated on October 25, 2026 and Hello Interview on October 26, 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.*