# Systematic FYI vs SD Primer

The clearest difference is iOS requirement: Systematic FYI at 15.1 against SD Primer's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Systematic FYI sells 1 in-app purchase, starting at $3.99 per month and SD Primer sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on September 20, 2026 and August 4, 2026 respectively.

## The numbers

| Metric | Systematic FYI | SD Primer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | Every 5 days |
| Size | 30 MB | 20 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [William Prin](https://appshunter.io/developer/1584585988) | [Ernesto Hilvano](https://appshunter.io/developer/1740292069) |

## What reviewers say

### Systematic FYI

[App page](https://appshunter.io/ios/app/systematic-fyi/id6747363270)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Systematic Premium | $3.99 | per month |


### 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 |


## Frequently asked questions

### Is Systematic FYI free?

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

### Is SD Primer free?

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

### Do Systematic FYI or SD Primer have ads?

Neither Systematic FYI nor SD Primer shows ads.

### Which is updated more often, Systematic FYI or SD Primer?

Systematic FYI ships an update every 5 days, and SD Primer every 5 days. Most recently, Systematic FYI was updated on September 20, 2026 and SD Primer on August 4, 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.*