# Fourier App vs Chemistry Toolbox

The clearest difference is in-app purchases: Fourier App at none against Chemistry Toolbox's 2. Fourier App also leads on iOS requirement (13.0 vs 17.6). Chemistry Toolbox's advantage is ads (none vs shown) and update cadence (daily vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Chemistry Toolbox sells 2 one-off in-app purchases. Fourier App asks for nothing beyond the download.

Fourier App ships an update every 3 months, Chemistry Toolbox daily. Both last shipped on October 28, 2026.

## The numbers

| Metric | Fourier App | Chemistry Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Daily** |
| Size | 30 MB | 12 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sthefano Schiavon](https://appshunter.io/developer/1882733645) | [Florent Breton](https://appshunter.io/developer/1184085186) |

## What reviewers say

### Fourier App

[App page](https://appshunter.io/ios/app/fourier-app/id6760314201)

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

**In-app purchases:** none


### Chemistry Toolbox

[App page](https://appshunter.io/ios/app/chemistry-toolbox/id6764052683)

**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 |


## Frequently asked questions

### Is Fourier App free?

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

### Is Chemistry Toolbox free?

Chemistry Toolbox is free to download, with in-app purchases available.

### Do Fourier App or Chemistry Toolbox have ads?

Fourier App shows ads; Chemistry Toolbox does not.

### Which is updated more often, Fourier App or Chemistry Toolbox?

Fourier App ships an update every 3 months, and Chemistry Toolbox daily. Most recently, Fourier App was updated on October 28, 2026 and Chemistry Toolbox on October 28, 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.*