# Atmospheric Model vs TimeCrystal

The clearest difference is rating: Atmospheric Model at 5.0 against TimeCrystal's 4.1. Atmospheric Model also leads on review sentiment (100% vs 67%) and monetization model (free vs free with in-app purchases). TimeCrystal's advantage is update cadence (fortnightly vs every 36 months) and ratings volume (9 vs 1). 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 holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: TimeCrystal has 9 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 67% of TimeCrystal's.

Atmospheric Model ships an update every 36 months, TimeCrystal fortnightly. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Atmospheric Model | TimeCrystal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/atmospheric-model/id1299565883/reviews)** | [4.1 (9 ratings)](https://appshunter.io/ios/app/timecrystal-ai-time-machine/id6449464951/reviews) |
| Number of ratings | 1 | **9** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 12 MB | 107 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Richard Loda](https://appshunter.io/developer/1291794366) | [Pulsar Innovations LLC](https://appshunter.io/developer/1689227458) |

## 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


### TimeCrystal

[App page](https://appshunter.io/ios/app/timecrystal-ai-time-machine/id6449464951)

Explore history through AI-powered virtual time travel. Engage with historical figures, uncover major events, and learn about daily life, art, culture, and technology from different eras. Your journey through time is personalized and saved for easy access.

**Highlights:** AI-powered time travel, Explore historical events, Engage with historical figures, Discover art and culture, Learn about daily life, Track technological advancements, Personalized journey history

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

**In-app purchases:** none


## Frequently asked questions

### Is Atmospheric Model free?

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

### Is TimeCrystal free?

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

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

Atmospheric Model is rated higher. Atmospheric Model averages 5.0 out of 5 from 1 ratings, while TimeCrystal averages 4.1 from 9 ratings.

### Do Atmospheric Model or TimeCrystal have ads?

Neither Atmospheric Model nor TimeCrystal shows ads.

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

Atmospheric Model ships an update every 36 months, and TimeCrystal fortnightly. Most recently, Atmospheric Model was updated on November 4, 2026 and TimeCrystal on November 3, 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.*