# cTrials vs PI

The clearest difference is update cadence: PI at fortnightly against cTrials's every 12 months. 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.

cTrials ships an update every 12 months, PI fortnightly. The most recent releases landed on June 11, 2026 and June 20, 2026 respectively.

## The numbers

| Metric | cTrials | PI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/ctrials/id362035301/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 12 MB | 21 MB |
| Requires iOS | **11.1** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [visual soft, inc](https://appshunter.io/developer/336927487) | [Refuah Solutions Ltd](https://appshunter.io/developer/1473298751) |

## What reviewers say

### cTrials

[App page](https://appshunter.io/ios/app/ctrials/id362035301)

This app provides a mobile interface for searching clinical trials listed on clinicaltrials.gov. It offers user-friendly navigation with basic, advanced, and country-specific search options. Users can save trials to favorites, email listings, and contact investigators.

**Highlights:** Clinical trial search, Basic and advanced search options, Search by country/state, Save trials to favorites, Email trial listings, Contact investigators, Search history

**In-app purchases:** none


### PI

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is cTrials free?

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

### Is PI free?

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

### Do cTrials or PI have ads?

Neither cTrials nor PI shows ads.

### Which is updated more often, cTrials or PI?

cTrials ships an update every 12 months, and PI fortnightly. Most recently, cTrials was updated on June 11, 2026 and PI on June 20, 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.*