# PI vs Harmonic Trial Professional

The clearest difference is update cadence: PI at every 3 weeks against Harmonic Trial Professional's every 20 months. Harmonic Trial Professional's advantage is iOS requirement (13.0 vs 15.1). 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.

PI ships an update every 3 weeks, Harmonic Trial Professional every 20 months. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | PI | Harmonic Trial Professional |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/harmonic-trial-professional/id1672931326/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 20 months |
| Monetization | — | Free |
| Size | 14 MB | 75 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Refuah Solutions LTD](https://appshunter.io/developer/1473298751) | [Lantern Pharma Inc.](https://appshunter.io/developer/1653896410) |

## What reviewers say

### PI

[App page](https://appshunter.io/ios/app/pi-support/id1663142410)

**Features:** macOS Compatibility

**In-app purchases:** none


### Harmonic Trial Professional

[App page](https://appshunter.io/ios/app/harmonic-trial-professional/id1672931326)

This app provides healthcare professionals with information about Non-Small Cell Lung Cancer (NSCLC) and a specific clinical trial. It offers educational content, trial details, site locators, and contact information.

**Highlights:** Learn about NSCLC, Information on investigational drug LP-300, Details on clinical trial participation, Find closest clinical trial sites, Contact trial team, Download trial documents, Informative video content

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PI free?

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

### Is Harmonic Trial Professional free?

Harmonic Trial Professional is free to download, with no in-app purchases.

### Do PI or Harmonic Trial Professional have ads?

Neither PI nor Harmonic Trial Professional shows ads.

### Which is updated more often, PI or Harmonic Trial Professional?

PI ships an update every 3 weeks, and Harmonic Trial Professional every 20 months. Most recently, PI was updated on October 4, 2026 and Harmonic Trial Professional on October 2, 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.*