# iPACES Studies vs PD

iPACES Studies and PD 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. Neither carries in-app purchases, so what you see is what you pay.

iPACES Studies ships an update every 3 weeks, PD every 2 weeks. The most recent releases landed on September 24, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | iPACES Studies | PD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ipaces-studies/id1452121691/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 715 MB | 133 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [iPACES LLC](https://appshunter.io/developer/1817523745) | [WellAware Research LLC](https://appshunter.io/developer/1590163578) |

## What reviewers say

### iPACES Studies

[App page](https://appshunter.io/ios/app/ipaces-studies/id1452121691)

Engage in neuro-exercises designed to enhance cognitive function. This application offers a preview of research-backed mental training or a pathway to join a scientific study.

**Highlights:** Cognitive function improvement, Neuro-exercise training, Research study participation, Preview of mental exercises, Designed for Apple Watch

**Features:** Apple Watch app

**In-app purchases:** none


### PD

[App page](https://appshunter.io/ios/app/pd-aware/id1627295190)

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

**In-app purchases:** none


## Frequently asked questions

### Is iPACES Studies free?

iPACES Studies is free to download, with no in-app purchases.

### Is PD free?

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

### Do iPACES Studies or PD have ads?

Neither iPACES Studies nor PD shows ads.

### Which is updated more often, iPACES Studies or PD?

iPACES Studies ships an update every 3 weeks, and PD every 2 weeks. Most recently, iPACES Studies was updated on September 24, 2026 and PD on September 6, 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.*