Organic Reactions vs R2R
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Organic Reactions
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.
- Functional group reactions
- Reaction mechanisms
- Reactant-product links
- Synthesis reactions
- Protection reactions
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This app allows people working in organic chemistry for a quick access to the main functional group reactions and their mechanisms. The application is organized to provide a direct link between a reactant and its corresponding product, as well as the synthesis and protection reactions. To enable a regular updating and to support this work, some of the functions, and a list of reactions sorted by name requires an additional purchase. If you have any problem, do not hesitate to send me an email, by explaining the nature of your problem and your phone model.
R2R
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.
- Learn functional groups
- Practice with R-Groups
- Timed challenges
- Review different groups
- Prepare for exams
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Put the Fun in Functional Groups with Prof. Rudi Rabbit! Aimed at those studying ALevel Chemistry, this app is designed to help you learn the different functional groups that may come up in your examinations or extension competitions. Use the 'Learn' screen to review the different groups and how you tell them apart, 'Practice' with different R-Groups and then 'Play' and try and beat the professor under timed conditions. Once you have beaten the professor then you are ready for some of Race to Revise's other organic synthesis games.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Organic Reactions | R2R |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (170 ratings) | 4.7 (129 ratings) — better |
| Positive reviews | 68.0% of reviews | 75.0% of reviews — better |
| Number of ratings | 170 — better | 129 |
| Update frequency | Every 10 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Florent Breton | James Styles |
Customer experience
Organic Reactions
R2R
In-app purchases
Organic Reactions
- One month subscription$0.99
- Full App$4.99
R2R
No in-app purchases
Questions
Is Organic Reactions free?
Is R2R free?
Which has better reviews, Organic Reactions or R2R?
Do Organic Reactions or R2R have ads?
Which is updated more often, Organic Reactions or R2R?
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