# SD Primer vs System Design Arcade

The clearest difference is in-app purchases: System Design Arcade at none against SD Primer's 2. System Design Arcade also leads on iOS requirement (15.1 vs 17.0). SD Primer's advantage is update cadence (every 5 days vs fortnightly). On price, ads and device support there is nothing between them.

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

SD Primer ships an update every 5 days, System Design Arcade fortnightly. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | SD Primer | System Design Arcade |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/system-design-arcade/id6759821733/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Monetization | — | Free |
| Size | 20 MB | 38 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ernesto Hilvano](https://appshunter.io/developer/1740292069) | [Harsha Hassan Somashekara](https://appshunter.io/developer/1842004703) |

## What reviewers say

### SD Primer

[App page](https://appshunter.io/ios/app/sd-primer/id6758010557)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SDPrimer Pro | $9.99 | per month |
| SDPrimer Pro | $99.99 | per year |


### System Design Arcade

[App page](https://appshunter.io/ios/app/system-design-arcade/id6759821733)

Learn complex system design concepts through engaging, bite-sized arcade-style games. Master building blocks, design full systems, and practice with real infrastructure tools. Progress is saved locally and no account is required.

**Highlights:** Arcade-style mini-games for system design concepts, End-to-end system design challenges, Hands-on drills with infrastructure tools, Narrative-driven story mode, Varied challenge types (multiple choice, puzzles, builder), Daily challenges with streak tracking, Offline progress saving

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

**In-app purchases:** none


## Frequently asked questions

### Is SD Primer free?

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

### Is System Design Arcade free?

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

### Do SD Primer or System Design Arcade have ads?

Neither SD Primer nor System Design Arcade shows ads.

### Which is updated more often, SD Primer or System Design Arcade?

SD Primer ships an update every 5 days, and System Design Arcade fortnightly. Most recently, SD Primer was updated on October 16, 2026 and System Design Arcade on October 1, 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.*