# Organic Reactions Tutor vs Structural Formulas Study

The clearest difference is in-app purchases: Structural Formulas Study at none against Organic Reactions Tutor's 1. Organic Reactions Tutor's advantage is update cadence (fortnightly vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Organic Reactions Tutor sells 1 one-off in-app purchase. Structural Formulas Study asks for nothing beyond the download.

Organic Reactions Tutor ships an update fortnightly, Structural Formulas Study every 5 weeks. The most recent releases landed on October 2, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Organic Reactions Tutor | Structural Formulas Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/organic-reactions-tutor/id6739188422/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 37 MB | 5 MB |
| Requires iOS | **17.0** | 18.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David Soulsby](https://appshunter.io/developer/1776367161) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### Organic Reactions Tutor

[App page](https://appshunter.io/ios/app/organic-reactions-tutor/id6739188422)

Master organic chemistry reactions with a comprehensive library of over 1,300 step-by-step mechanisms and concise notes. Study using flashcards or multiple-choice quizzes, create custom study packs, and track your progress with trophies. Learn offline in over 17 languages.

**Highlights:** 1,300+ curated reactions, Step-by-step mechanisms, Flashcards and multiple-choice quizzes, Custom reaction creation, Study packs and progress tracking, Offline access, Multilingual support (17+ languages)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Categories | $1.99 | one-time |


### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Organic Reactions Tutor free?

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

### Is Structural Formulas Study free?

Structural Formulas Study is free to download, with no in-app purchases.

### Do Organic Reactions Tutor or Structural Formulas Study have ads?

Neither Organic Reactions Tutor nor Structural Formulas Study shows ads.

### Which is updated more often, Organic Reactions Tutor or Structural Formulas Study?

Organic Reactions Tutor ships an update fortnightly, and Structural Formulas Study every 5 weeks. Most recently, Organic Reactions Tutor was updated on October 2, 2026 and Structural Formulas Study on September 20, 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.*