# CSN Quiz vs Structural Formulas Study

The clearest difference is update cadence: Structural Formulas Study at every 5 weeks against CSN Quiz's every 12 months. CSN Quiz's advantage is iOS requirement (9.0 vs 18.4). On price, ads, in-app purchases and device support there is nothing between them.

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

CSN Quiz ships an update every 12 months, Structural Formulas Study every 5 weeks. The most recent releases landed on October 9, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | CSN Quiz | Structural Formulas Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/structural-formulas-study/id6752260162/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 162 MB | 5 MB |
| Requires iOS | **9.0** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CONSEJO DE SEGURIDAD NUCLEAR](https://appshunter.io/developer/998296503) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### CSN Quiz

[App page](https://appshunter.io/ios/app/csn-quiz/id1354956272)

**Features:** macOS Compatibility

**In-app purchases:** none


### Structural Formulas Study

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

Explore and study over 100 molecular structures with detailed properties and clear diagrams. This app offers quick search and filtering for efficient exam preparation and daily learning, with offline access available.

**Highlights:** 100+ molecular structures, Detailed structural formulas, Essential chemical properties, Quick search and filters, Offline access, Exam preparation tool

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

**In-app purchases:** none


## Frequently asked questions

### Is CSN Quiz free?

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

### Is Structural Formulas Study free?

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

### Do CSN Quiz or Structural Formulas Study have ads?

Neither CSN Quiz nor Structural Formulas Study shows ads.

### Which is updated more often, CSN Quiz or Structural Formulas Study?

CSN Quiz ships an update every 12 months, and Structural Formulas Study every 5 weeks. Most recently, CSN Quiz was updated on October 9, 2026 and Structural Formulas Study on October 12, 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.*