# Flat Earth Pro vs QSI

The clearest difference is price: QSI at Free against Flat Earth Pro's $3.99. QSI also leads on review sentiment (92% vs 81%) and iOS requirement (11.0 vs 13.0). On rating, ratings volume, ads and in-app purchases there is nothing between them.

QSI is free to download; Flat Earth Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Flat Earth Pro against 4.8 for QSI. Both are backed by a comparable volume of ratings — 108 and 61 respectively. Written reviews are what separate them: 81% of Flat Earth Pro's written reviews are positive against 92% of QSI's.

## The numbers

| Metric | Flat Earth Pro | QSI |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.9 (108 ratings)](https://appshunter.io/ios/app/flat-earth-pro/id1664580677/reviews)** | [4.8 (61 ratings)](https://appshunter.io/ios/app/qsi/id6447522381/reviews) |
| Number of ratings | **108** | 61 |
| Positive reviews | 81.3% of reviews | **91.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Monetization | Free | Free |
| Size | 224 MB | 45 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Othman Alzahrani](https://appshunter.io/developer/1664580679) | [Get Konversed Pty Ltd](https://appshunter.io/developer/670327904) |

## What reviewers say

### Flat Earth Pro

[App page](https://appshunter.io/ios/app/flat-earth-pro/id1664580677)

Visualize celestial body positions, daylight coverage, and moon phases on an Earth projection. Explore sun and moon overhead positions, rise/set times, and lunar details. Features offline functionality and a local weather forecast.

**Highlights:** Daylight coverage visualization, Sun and moon overhead positions, Rise and set times, Moon phases and libration, Offline functionality, Local weather forecast

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

**In-app purchases:** none


### QSI

[App page](https://appshunter.io/ios/app/qsi/id6447522381)

This app connects a global community focused on shaping future quantum technologies and societal progress. It offers educational resources and onboarding materials to navigate the Quantum Financial System and Quantum Matrix on the Stellar blockchain. Members can join local groups to collaborate on projects and philanthropic endeavors.

**Highlights:** Quantum technology education, Quantum Financial System (QFS) exploration, Quantum Matrix (QM) integration, Stellar blockchain ecosystem, Global community networking, Philanthropic project collaboration, Sovereign contributor empowerment

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Flat Earth Pro free?

Flat Earth Pro costs $3.99, with no in-app purchases.

### Is QSI free?

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

### Which has better reviews, Flat Earth Pro or QSI?

Flat Earth Pro is rated higher. Flat Earth Pro averages 4.9 out of 5 from 108 ratings, while QSI averages 4.8 from 61 ratings.

### Do Flat Earth Pro or QSI have ads?

Neither Flat Earth Pro nor QSI shows ads.

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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.*