# Atmospheric Model vs TMR Memory Test

The clearest difference is update cadence: TMR Memory Test at every 3 weeks against Atmospheric Model's every 36 months. 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.

Atmospheric Model ships an update every 36 months, TMR Memory Test every 3 weeks. The most recent releases landed on June 1, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Atmospheric Model | TMR Memory Test |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 12 MB | 19 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Richard Loda](https://appshunter.io/developer/1291794366) | [Backyard Brains](https://appshunter.io/developer/367151203) |

## 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


### TMR Memory Test

[App page](https://appshunter.io/ios/app/tmr-memory-test/id1467896935)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Atmospheric Model free?

Atmospheric Model is free to download, with no in-app purchases.

### Is TMR Memory Test free?

TMR Memory Test is free to download, with no in-app purchases.

### Do Atmospheric Model or TMR Memory Test have ads?

Neither Atmospheric Model nor TMR Memory Test shows ads.

### Which is updated more often, Atmospheric Model or TMR Memory Test?

Atmospheric Model ships an update every 36 months, and TMR Memory Test every 3 weeks. Most recently, Atmospheric Model was updated on June 1, 2026 and TMR Memory Test on September 17, 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.*