# ORB Participant vs Rex

The clearest difference is rating: Rex at 5.0 against ORB Participant's 3.1. Rex also leads on update cadence (weekly vs every 4 months). ORB Participant's advantage is in-app purchases (none vs 2) and ratings volume (66 vs 1). On price, 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. ORB Participant asks for nothing beyond the download.

Rex holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: ORB Participant has 66 ratings behind it against 1, so its average is the more settled of the two.

ORB Participant ships an update every 4 months, Rex weekly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ORB Participant | Rex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (66 ratings)](https://appshunter.io/ios/app/orb-participant/id1215719234/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rex-study-smarter/id6775703977/reviews)** |
| Number of ratings | **66** | 1 |
| Positive reviews | 31.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 43 MB | 108 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 12+ |
| Developer | [The Duke of Edinburgh's International Award Foundation](https://appshunter.io/developer/1215719233) | [Oran Egbuchunam](https://appshunter.io/developer/6775544967) |

## What reviewers say

### ORB Participant

[App page](https://appshunter.io/ios/app/orb-participant/id1215719234)

Track your progress for The Duke of Edinburgh's International Award. Log activities, manage your sections, and submit them to your Assessor and Award Leader for completion, all from your mobile device.

**Highlights:** Manage Award progress, Set up activities, Create progress logs, Submit Award sections, Assessor and Leader approval

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use interface for logging hours
- 🚀 Convenient mobile access for on-the-go logging
- ✅ Reliable for basic activity tracking
- 📱 Simple and straightforward design
- ⭐ Helpful for Duke of Edinburgh participants

**What reviewers complain about**

- 🐛 Frequent crashes and freezing
- ⚠️ Hours calculation errors and inaccuracies
- 🔌 Network error messages despite working connection
- ❌ Limited editing capabilities after submission
- 😤 Slow and laggy performance

**Reported bugs**

- Hours not accumulating correctly - logs multiple hours as single hour
- Progress bar not increasing when adding logs
- Network error messages appearing despite valid connection
- App crashes when entering journey observations
- App crashes when editing and resubmitting assessments

**Requested features**

- Ability to edit activities and submissions after approval
- Resend assessment/approval functionality
- Message/comment system between users and leaders
- View approved evidence and journey details after submission
- Edit activity names if misspelled


### 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 ORB Participant free?

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

### Is Rex free?

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

### Which has better reviews, ORB Participant or Rex?

Rex is rated higher. ORB Participant averages 3.1 out of 5 from 66 ratings, while Rex averages 5.0 from 1 ratings.

### Do ORB Participant or Rex have ads?

Neither ORB Participant nor Rex shows ads.

### Which is updated more often, ORB Participant or Rex?

ORB Participant ships an update every 4 months, and Rex weekly. Most recently, ORB Participant was updated on November 2, 2026 and Rex on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*