# PI vs Peter the Protocol Reader

PI and Peter the Protocol Reader 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.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PI | Peter the Protocol Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/peter-the-protocol-reader/id6754336090/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | — | Free |
| Size | 14 MB | 119 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Refuah Solutions LTD](https://appshunter.io/developer/1473298751) | [Care Access](https://appshunter.io/developer/1889628360) |

## What reviewers say

### PI

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Peter the Protocol Reader

[App page](https://appshunter.io/ios/app/peter-the-protocol-reader/id6754336090)

This AI assistant streamlines clinical research by quickly converting protocols into actionable insights. It's designed to enhance the quality and efficiency of research delivery for clinical sites.

**Highlights:** Protocol to practical insights, AI-powered assistance, High-quality research delivery, Secure and trusted, Confidence in research

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

**In-app purchases:** none


## Frequently asked questions

### Is PI free?

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

### Is Peter the Protocol Reader free?

Peter the Protocol Reader is free to download, with no in-app purchases.

### Do PI or Peter the Protocol Reader have ads?

Neither PI nor Peter the Protocol Reader shows ads.

### Which is updated more often, PI or Peter the Protocol Reader?

PI ships an update every 3 weeks, and Peter the Protocol Reader every 3 weeks. Most recently, PI was updated on November 3, 2026 and Peter the Protocol Reader on October 30, 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.*