# R2R vs SynStrategy

The clearest difference is review sentiment: SynStrategy at 100% against R2R's 75%. SynStrategy also leads on rating (5.0 vs 4.7). R2R's advantage is ratings volume (124 vs 9) and device support (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

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

SynStrategy holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: R2R has 124 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 75% of R2R's written reviews are positive against 100% of SynStrategy's.

R2R ships an update every 5 months, SynStrategy every 3 months. The most recent releases landed on September 17, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | R2R | SynStrategy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (124 ratings)](https://appshunter.io/ios/app/r2r-functional-groups/id1225511399/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/synstrategy/id6755611244/reviews)** |
| Number of ratings | **124** | 9 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 57 MB | 36 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [James Styles](https://appshunter.io/developer/1537953716) | [Willi M. Amberg](https://appshunter.io/developer/1854863487) |

## 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


### SynStrategy

[App page](https://appshunter.io/ios/app/synstrategy/id6755611244)

This app categorizes organic reactions by the functional groups they form, aiding chemists in synthetic analysis. It offers over 500 transformations and 400 synthesis examples, with detailed subdivisions for clarity.

**Highlights:** Reactions categorized by functional group, 27 main functional group categories, Over 500 transformations, Over 400 total synthesis examples, Subdivided functional group categories, Highlights synthetic use cases

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is R2R free?

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

### Is SynStrategy free?

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

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

SynStrategy is rated higher. R2R averages 4.7 out of 5 from 124 ratings, while SynStrategy averages 5.0 from 9 ratings.

### Do R2R or SynStrategy have ads?

Neither R2R nor SynStrategy shows ads.

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

R2R ships an update every 5 months, and SynStrategy every 3 months. Most recently, R2R was updated on September 17, 2026 and SynStrategy on September 11, 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.*