# Crystal Flight vs BiasProof

The clearest difference is in-app purchases: Crystal Flight at none against BiasProof's 1. BiasProof's advantage is update cadence (every 2 months vs every 5 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. BiasProof sells 1 one-off in-app purchase. Crystal Flight asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Crystal Flight against 5.0 for BiasProof. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Crystal Flight ships an update every 5 months, BiasProof every 2 months. The most recent releases landed on July 5, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Crystal Flight | BiasProof |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/crystal-flight/id1436396839/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/biasproof/id6756802032/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 10 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Jeff Weeks](https://appshunter.io/developer/326104308) | [Justin Neuman](https://appshunter.io/developer/1859103444) |

## 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


### BiasProof

[App page](https://appshunter.io/ios/app/biasproof/id6756802032)

This app gamifies cognitive bias training by presenting realistic scenarios to help users identify and resist emotional traps, cognitive errors, and modern scams. It aims to build measurable resistance to thinking pitfalls that affect decisions, relationships, and finances.

**Highlights:** Gamified mental calibration, Realistic scenario simulations, Identification of emotional traps and scams, Measurable resistance tracking, Progress tracking and leaderboards, Daily habit building

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BiasProof Pro - LIfetime Access | $4.99 | one-time |


## Frequently asked questions

### Is Crystal Flight free?

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

### Is BiasProof free?

BiasProof is free to download, with in-app purchases available.

### Which has better reviews, Crystal Flight or BiasProof?

Crystal Flight and BiasProof are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Crystal Flight or BiasProof have ads?

Neither Crystal Flight nor BiasProof shows ads.

### Which is updated more often, Crystal Flight or BiasProof?

Crystal Flight ships an update every 5 months, and BiasProof every 2 months. Most recently, Crystal Flight was updated on July 5, 2026 and BiasProof on September 13, 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.*