# PI vs RESTORATiVE303 Study

PI and RESTORATiVE303 Study 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.

PI ships an update fortnightly, RESTORATiVE303 Study every 4 weeks. The most recent releases landed on June 20, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | PI | RESTORATiVE303 Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 weeks |
| Size | 21 MB | 72 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Refuah Solutions Ltd](https://appshunter.io/developer/1473298751) | [ERT, INC](https://appshunter.io/developer/1160214546) |

## What reviewers say

### PI

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

**Features:** macOS Compatibility

**In-app purchases:** none


### RESTORATiVE303 Study

[App page](https://appshunter.io/ios/app/restorative303-study/id6461456205)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PI free?

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

### Is RESTORATiVE303 Study free?

RESTORATiVE303 Study is free to download, with no in-app purchases.

### Do PI or RESTORATiVE303 Study have ads?

Neither PI nor RESTORATiVE303 Study shows ads.

### Which is updated more often, PI or RESTORATiVE303 Study?

PI ships an update fortnightly, and RESTORATiVE303 Study every 4 weeks. Most recently, PI was updated on June 20, 2026 and RESTORATiVE303 Study on May 17, 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.*