# Atmospheric Model vs Chemistry Toolbox

The clearest difference is in-app purchases: Atmospheric Model at none against Chemistry Toolbox's 2. Atmospheric Model also leads on iOS requirement (12.0 vs 17.6). Chemistry Toolbox's advantage is update cadence (daily vs every 36 months). On price, ads and device support there is nothing between them.

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

Atmospheric Model ships an update every 36 months, Chemistry Toolbox daily. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Atmospheric Model | Chemistry Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/atmospheric-model/id1299565883/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 36 months | **Daily** |
| Monetization | Free | — |
| Size | 12 MB | 12 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Richard Loda](https://appshunter.io/developer/1291794366) | [Florent Breton](https://appshunter.io/developer/1184085186) |

## What reviewers say

### Atmospheric Model

[App page](https://appshunter.io/ios/app/atmospheric-model/id1299565883)

Explore planetary atmospheres with a radiative transfer model. Calculate emission temperatures and flux densities, then modify parameters like albedo and solar constant to simulate atmospheric changes and their effects on climate.

**Highlights:** Radiative transfer model for planetary atmospheres, Calculates emission temperature and flux densities, Adjustable parameters: albedo, distance from sun, extinction coefficients, Supports 9 solar system planets or custom planets, Generates flux diagrams of incoming and outgoing radiation, Saves and compares two model run results, Exports data to CSV for spreadsheet analysis

**Features:** macOS Compatibility

**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 Atmospheric Model free?

Atmospheric Model 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 Atmospheric Model or Chemistry Toolbox have ads?

Neither Atmospheric Model nor Chemistry Toolbox shows ads.

### Which is updated more often, Atmospheric Model or Chemistry Toolbox?

Atmospheric Model ships an update every 36 months, and Chemistry Toolbox daily. Most recently, Atmospheric Model was updated on October 10, 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.*