# Concentrations vs Chemistry Toolbox

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

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

Concentrations ships an update every 3 months, Chemistry Toolbox daily. The most recent releases landed on October 1, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Concentrations | Chemistry Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Size | 7 MB | 12 MB |
| Requires iOS | 18.5 | **17.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Marcal Casas Cartagena](https://appshunter.io/developer/468150889) | [Florent Breton](https://appshunter.io/developer/1184085186) |

## What reviewers say

### Concentrations

[App page](https://appshunter.io/ios/app/concentrations/id468150886)

**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 Concentrations free?

Concentrations 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 Concentrations or Chemistry Toolbox have ads?

Neither Concentrations nor Chemistry Toolbox shows ads.

### Which is updated more often, Concentrations or Chemistry Toolbox?

Concentrations ships an update every 3 months, and Chemistry Toolbox daily. Most recently, Concentrations was updated on October 1, 2026 and Chemistry Toolbox on October 19, 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.*