# Atmospheric Model vs StellarRAD

The clearest difference is review sentiment: Atmospheric Model at 100% against StellarRAD's 33%. Atmospheric Model also leads on rating (5.0 vs 3.6) and device support (3 vs 1). StellarRAD's advantage is update cadence (every 3 days vs every 36 months) and ratings volume (10 vs 1). On price, ads, in-app purchases and monetization model 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 holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: StellarRAD has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Atmospheric Model's written reviews are positive against 33% of StellarRAD's.

Atmospheric Model ships an update every 36 months, StellarRAD every 3 days. The most recent releases landed on October 10, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Atmospheric Model | StellarRAD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/atmospheric-model/id1299565883/reviews)** | [3.6 (10 ratings)](https://appshunter.io/ios/app/stellarrad/id1544319555/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 12 MB | 80 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Richard Loda](https://appshunter.io/developer/1291794366) | [Stellarnet Inc](https://appshunter.io/developer/1544319557) |

## 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


### StellarRAD

[App page](https://appshunter.io/ios/app/stellarrad/id1544319555)

This app enables real-time light spectrum analysis using WiFi-enabled spectrometers. It allows users to capture and analyze various light parameters, including spectral irradiance, lumens, and colorimetric data like CRI and CCT. Data can be easily saved and exported in multiple formats.

**Highlights:** Real-time light measurement, Full spectrum analysis, Control spectrometer, Spectral irradiance and lumens, Colorimetric analysis (CRI, CCT, xy), Save and export data (.IRR, screenshot, PDF)

**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 StellarRAD free?

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

### Which has better reviews, Atmospheric Model or StellarRAD?

Atmospheric Model is rated higher. Atmospheric Model averages 5.0 out of 5 from 1 ratings, while StellarRAD averages 3.6 from 10 ratings.

### Do Atmospheric Model or StellarRAD have ads?

Neither Atmospheric Model nor StellarRAD shows ads.

### Which is updated more often, Atmospheric Model or StellarRAD?

Atmospheric Model ships an update every 36 months, and StellarRAD every 3 days. Most recently, Atmospheric Model was updated on October 10, 2026 and StellarRAD on September 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*