# Organic Reactions vs R2R

The clearest difference is in-app purchases: R2R at none against Organic Reactions's 2. R2R also leads on update cadence (every 5 months vs every 10 months) and iOS requirement (9.0 vs 17.6). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Organic Reactions sells 2 one-off in-app purchases. R2R asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Organic Reactions against 4.7 for R2R. Both are backed by a comparable volume of ratings — 170 and 129 respectively. Written reviews are what separate them: 68% of Organic Reactions's written reviews are positive against 75% of R2R's.

Organic Reactions ships an update every 10 months, R2R every 5 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Organic Reactions | R2R |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (170 ratings)](https://appshunter.io/ios/app/organic-reactions/id1184085187/reviews) | **[4.7 (129 ratings)](https://appshunter.io/ios/app/r2r-functional-groups/id1225511399/reviews)** |
| Number of ratings | **170** | 129 |
| Positive reviews | 68.0% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 5 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 16 MB | 57 MB |
| Requires iOS | 17.6 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Florent Breton](https://appshunter.io/developer/1184085186) | [James Styles](https://appshunter.io/developer/1537953716) |

## What reviewers say

### Organic Reactions

[App page](https://appshunter.io/ios/app/organic-reactions/id1184085187)

Access key functional group reactions and their mechanisms in organic chemistry. Quickly find links between reactants and products, including synthesis and protection reactions. Some advanced features and reaction lists require an additional purchase.

**Highlights:** Functional group reactions, Reaction mechanisms, Reactant-product links, Synthesis reactions, Protection reactions

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One month subscription | $0.99 | one-time |
| Full App | $4.99 | one-time |


### 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


## Frequently asked questions

### Is Organic Reactions free?

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

### Is R2R free?

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

### Which has better reviews, Organic Reactions or R2R?

R2R is rated higher. Organic Reactions averages 4.7 out of 5 from 170 ratings, while R2R averages 4.7 from 129 ratings.

### Do Organic Reactions or R2R have ads?

Neither Organic Reactions nor R2R shows ads.

### Which is updated more often, Organic Reactions or R2R?

Organic Reactions ships an update every 10 months, and R2R every 5 months. Most recently, Organic Reactions was updated on October 22, 2026 and R2R 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.*