# Scollr vs Rex

The clearest difference is in-app purchases: Scollr at none against Rex's 2. Scollr also leads on iOS requirement (15.1 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Rex sells 2 in-app purchases, starting at $12.99 per month. Scollr asks for nothing beyond the download.

Scollr ships an update fortnightly, Rex weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Scollr | Rex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rex-study-smarter/id6775703977/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 32 MB | 108 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 12+ |
| Developer | [Chris Colpitts](https://appshunter.io/developer/1892198601) | [Oran Egbuchunam](https://appshunter.io/developer/6775544967) |

## What reviewers say

### Scollr

[App page](https://appshunter.io/ios/app/scollr-research-papers/id6761957461)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rex

[App page](https://appshunter.io/ios/app/rex-study-smarter/id6775703977)

This app offers an interactive learning experience by explaining concepts aloud and allowing users to manipulate 3D models and live charts. It consolidates notes, PDFs, and web research onto a single canvas and supports collaborative study sessions.

**Highlights:** Voice explanations of questions, Interactive 3D scenes and live charts, Consolidated study canvas, Lecture transcription and note-taking, Read-aloud functionality for notes and PDFs, Language practice with real scenes, Live collaborative study boards

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $12.99 | per month |
| Rex Pro Annual | $99.99 | per year |


## Frequently asked questions

### Is Scollr free?

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

### Is Rex free?

Rex is free to download, with in-app purchases available.

### Do Scollr or Rex have ads?

Neither Scollr nor Rex shows ads.

### Which is updated more often, Scollr or Rex?

Scollr ships an update fortnightly, and Rex weekly. Most recently, Scollr was updated on October 24, 2026 and Rex on October 24, 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.*