# RK Performance vs CORE4 Members

RK Performance and CORE4 Members are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. RK Performance sells 1 in-app purchase, starting at $399.99 per month and CORE4 Members sells 1 in-app purchase, starting at $299.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 7, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | RK Performance | CORE4 Members |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Size | 52 MB | 57 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Robin Good LLC](https://appshunter.io/developer/1683914246) | [Coach Caelum](https://appshunter.io/developer/1878628764) |

## What reviewers say

### RK Performance

[App page](https://appshunter.io/ios/app/rk-performance/id6448198421)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Plan | $399.99 | per month |


### CORE4 Members

[App page](https://appshunter.io/ios/app/core4-members/id6759445029)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The CORE4 Framework | $299.99 | per month |


## Frequently asked questions

### Is RK Performance free?

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

### Is CORE4 Members free?

CORE4 Members is free to download, with in-app purchases available.

### Do RK Performance or CORE4 Members have ads?

Neither RK Performance nor CORE4 Members shows ads.

### Which is updated more often, RK Performance or CORE4 Members?

RK Performance ships an update monthly, and CORE4 Members monthly. Most recently, RK Performance was updated on October 7, 2026 and CORE4 Members on October 17, 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.*