# Kegel Study vs NoR∆ Dynamics

The clearest difference is update cadence: NoR∆ Dynamics at every 3 days against Kegel Study's every 21 months. Kegel Study's advantage is iOS requirement (8.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Kegel Study ships an update every 21 months, NoR∆ Dynamics every 3 days. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Kegel Study | NoR∆ Dynamics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 3 days** |
| Size | 85 MB | 4 MB |
| Requires iOS | **8.0** | 26.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [University of California at San Francisco](https://appshunter.io/developer/446489325) | [Lukas Madeira](https://appshunter.io/developer/1880415911) |

## What reviewers say

### Kegel Study

[App page](https://appshunter.io/ios/app/kegel-study/id1215415506)

**Features:** macOS Compatibility

**In-app purchases:** none


### NoR∆ Dynamics

[App page](https://appshunter.io/ios/app/nor-dynamics/id6759738264)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kegel Study free?

Kegel Study is free to download, with no in-app purchases.

### Is NoR∆ Dynamics free?

NoR∆ Dynamics is free to download, with no in-app purchases.

### Do Kegel Study or NoR∆ Dynamics have ads?

Neither Kegel Study nor NoR∆ Dynamics shows ads.

### Which is updated more often, Kegel Study or NoR∆ Dynamics?

Kegel Study ships an update every 21 months, and NoR∆ Dynamics every 3 days. Most recently, Kegel Study was updated on September 10, 2026 and NoR∆ Dynamics on September 23, 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.*