# Learn Docker Offline vs System Design Refresher

The clearest difference is price: System Design Refresher at Free against Learn Docker Offline's $1.99. System Design Refresher also leads on update cadence (monthly vs every 9 months). Learn Docker Offline's advantage is iOS requirement (13.0 vs 26.2). On ads, in-app purchases and device support there is nothing between them.

System Design Refresher is free to download; Learn Docker Offline costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Learn Docker Offline ships an update every 9 months, System Design Refresher monthly. The most recent releases landed on September 11, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Learn Docker Offline | System Design Refresher |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Size | 61 MB | 18 MB |
| Requires iOS | **13.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Muhammad Mubeen](https://appshunter.io/developer/1553722821) | [Saurabh Sharma](https://appshunter.io/developer/1883599017) |

## What reviewers say

### Learn Docker Offline

[App page](https://appshunter.io/ios/app/learn-docker-offline/id6753736716)

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

**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 Learn Docker Offline free?

Learn Docker Offline costs $1.99, with no in-app purchases.

### Is System Design Refresher free?

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

### Do Learn Docker Offline or System Design Refresher have ads?

Neither Learn Docker Offline nor System Design Refresher shows ads.

### Which is updated more often, Learn Docker Offline or System Design Refresher?

Learn Docker Offline ships an update every 9 months, and System Design Refresher monthly. Most recently, Learn Docker Offline was updated on September 11, 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.*