# SD Primer vs Syswise

The clearest difference is update cadence: Syswise at daily against SD Primer's every 5 days. Syswise also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases 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 and Syswise sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

SD Primer ships an update every 5 days, Syswise daily. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SD Primer | Syswise |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Daily** |
| Size | 20 MB | 39 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Ernesto Hilvano](https://appshunter.io/developer/1740292069) | [Cengizhan Hakan](https://appshunter.io/developer/6796688466) |

## 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 |


### Syswise

[App page](https://appshunter.io/ios/app/syswise-system-design-prep/id6796688464)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $4.99 | per 7 days |
| Premium Annual | $39.99 | per year |
| 500 Gems | $1.99 | one-time |
| 1400 Gems | $4.99 | one-time |
| 3000 Gems | $9.99 | one-time |


## Frequently asked questions

### Is SD Primer free?

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

### Is Syswise free?

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

### Do SD Primer or Syswise have ads?

Neither SD Primer nor Syswise shows ads.

### Which is updated more often, SD Primer or Syswise?

SD Primer ships an update every 5 days, and Syswise daily. Most recently, SD Primer was updated on October 1, 2026 and Syswise on October 7, 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.*