# R2R vs SciQuiz

The clearest difference is ads: R2R at none against SciQuiz's shown. R2R also leads on monetization model (free vs ad-supported) and review sentiment (75% vs 67%). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.7 for R2R against 4.6 for SciQuiz. Both are backed by a comparable volume of ratings — 124 and 53 respectively. Written reviews are what separate them: 75% of R2R's written reviews are positive against 67% of SciQuiz's.

R2R ships an update every 5 months, SciQuiz every 3 months. The most recent releases landed on September 17, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | R2R | SciQuiz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (124 ratings)](https://appshunter.io/ios/app/r2r-functional-groups/id1225511399/reviews)** | [4.6 (53 ratings)](https://appshunter.io/ios/app/sciquiz-science-quiz/id1440078272/reviews) |
| Number of ratings | **124** | 53 |
| Positive reviews | **75.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | **Free** | Ad-supported |
| Size | 57 MB | 297 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 9+ |
| Developer | [James Styles](https://appshunter.io/developer/1537953716) | [Jianfeng Wu](https://appshunter.io/developer/1435210283) |

## What reviewers say

### R2R

[App page](https://appshunter.io/ios/app/r2r-functional-groups/id1225511399)

Learn and practice organic chemistry functional groups with interactive lessons and timed challenges. This app is designed for A-Level Chemistry students to prepare for exams and competitions.

**Highlights:** Learn functional groups, Practice with R-Groups, Timed challenges, Review different groups, Prepare for exams

**In-app purchases:** none


### SciQuiz

[App page](https://appshunter.io/ios/app/sciquiz-science-quiz/id1440078272)

Engage with over 45,000 science quizzes covering biology, chemistry, geography, and physics. Explore scientific concepts through interactive 3D models and discover the world of science with curated news summaries.

**Highlights:** Extensive quiz library (45,000+), Biology, Chemistry, Geography, Physics topics, Interactive 3D molecule models, Microcosm exploration, Science and health news summaries, Experiment-based learning

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is R2R free?

R2R is free to download, with no in-app purchases.

### Is SciQuiz free?

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

### Which has better reviews, R2R or SciQuiz?

R2R is rated higher. R2R averages 4.7 out of 5 from 124 ratings, while SciQuiz averages 4.6 from 53 ratings.

### Do R2R or SciQuiz have ads?

SciQuiz shows ads; R2R does not.

### Which is updated more often, R2R or SciQuiz?

R2R ships an update every 5 months, and SciQuiz every 3 months. Most recently, R2R was updated on September 17, 2026 and SciQuiz on September 25, 2026.

---

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