# System Design Refresher vs LangoFunk

The clearest difference is in-app purchases: System Design Refresher at none against LangoFunk's 2. LangoFunk's advantage is update cadence (every 3 days vs monthly) and iOS requirement (15.6 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. LangoFunk sells 2 in-app purchases, starting at $9.99 per month. System Design Refresher asks for nothing beyond the download.

System Design Refresher ships an update monthly, LangoFunk every 3 days. The most recent releases landed on September 30, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | System Design Refresher | LangoFunk |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Size | 18 MB | 53 MB |
| Requires iOS | 26.2 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Saurabh Sharma](https://appshunter.io/developer/1883599017) | [LangoFunk](https://appshunter.io/developer/6773609101) |

## 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


### LangoFunk

[App page](https://appshunter.io/ios/app/langofunk-learn-with-music/id6773609099)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $9.99 | per month |
| Yearly Plan | $29.99 | per year |


## Frequently asked questions

### Is System Design Refresher free?

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

### Is LangoFunk free?

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

### Do System Design Refresher or LangoFunk have ads?

Neither System Design Refresher nor LangoFunk shows ads.

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

System Design Refresher ships an update monthly, and LangoFunk every 3 days. Most recently, System Design Refresher was updated on September 30, 2026 and LangoFunk on October 18, 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.*