# Crystal Flight vs Polynomial Regression

The clearest difference is update cadence: Polynomial Regression at every 3 weeks against Crystal Flight's every 5 months. Polynomial Regression also leads on iOS requirement (15.0 vs 17.0). 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.

Crystal Flight ships an update every 5 months, Polynomial Regression every 3 weeks. The most recent releases landed on July 5, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Crystal Flight | Polynomial Regression |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/crystal-flight/id1436396839/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 4 MB | 4 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jeff Weeks](https://appshunter.io/developer/326104308) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Crystal Flight

[App page](https://appshunter.io/ios/app/crystal-flight/id1436396839)

Experience free flight within diverse crystal environments. Navigate your journey by simply tilting your iPhone or iPad to control direction.

**Highlights:** Free flight simulation, Crystal environments, Tilt-to-navigate controls, iPhone and iPad support

**In-app purchases:** none


### Polynomial Regression

[App page](https://appshunter.io/ios/app/polynomial-regression/id6741364702)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Crystal Flight free?

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

### Is Polynomial Regression free?

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

### Do Crystal Flight or Polynomial Regression have ads?

Neither Crystal Flight nor Polynomial Regression shows ads.

### Which is updated more often, Crystal Flight or Polynomial Regression?

Crystal Flight ships an update every 5 months, and Polynomial Regression every 3 weeks. Most recently, Crystal Flight was updated on July 5, 2026 and Polynomial Regression on September 14, 2026.

---

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