# SD Primer vs Performance Engineer Trainer

The clearest difference is in-app purchases: Performance Engineer Trainer at none against SD Primer's 2. On price, update cadence, 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. Performance Engineer Trainer asks for nothing beyond the download.

SD Primer ships an update every 5 days, Performance Engineer Trainer every 4 days. The most recent releases landed on August 4, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | SD Primer | Performance Engineer Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 20 MB | 4 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Ernesto Hilvano](https://appshunter.io/developer/1740292069) | [Kirill Kalistratov](https://appshunter.io/developer/1888794382) |

## 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 |


### Performance Engineer Trainer

[App page](https://appshunter.io/ios/app/performance-engineer-trainer/id6761308281)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SD Primer free?

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

### Is Performance Engineer Trainer free?

Performance Engineer Trainer is free to download, with no in-app purchases.

### Do SD Primer or Performance Engineer Trainer have ads?

Neither SD Primer nor Performance Engineer Trainer shows ads.

### Which is updated more often, SD Primer or Performance Engineer Trainer?

SD Primer ships an update every 5 days, and Performance Engineer Trainer every 4 days. Most recently, SD Primer was updated on August 4, 2026 and Performance Engineer Trainer on September 10, 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.*