# Flat Earth Pro vs Fire Alarm System Simulator

The clearest difference is update cadence: Fire Alarm System Simulator at fortnightly against Flat Earth Pro's every 6 weeks. Fire Alarm System Simulator also leads on price ($2.99 vs $3.99). Flat Earth Pro's advantage is chart position (#163 vs unranked) and iOS requirement (13.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Flat Earth Pro costs $3.99 and Fire Alarm System Simulator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Flat Earth Pro ships an update every 6 weeks, Fire Alarm System Simulator fortnightly. The most recent releases landed on September 25, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Flat Earth Pro | Fire Alarm System Simulator |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | **[4.9 (108 ratings)](https://appshunter.io/ios/app/flat-earth-pro/id1664580677/reviews)** | — |
| Number of ratings | **108** | — |
| Positive reviews | 81.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free | — |
| Best chart rank | **#163** | — |
| Size | 224 MB | 155 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Othman Alzahrani](https://appshunter.io/developer/1664580679) | [Yuhsiu Lai](https://appshunter.io/developer/433114647) |

## What reviewers say

### Flat Earth Pro

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

**Currently charting:** #163 Top Paid · Education (US App Store)

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


### Fire Alarm System Simulator

[App page](https://appshunter.io/ios/app/fire-alarm-system-simulator/id6766403913)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flat Earth Pro free?

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

### Is Fire Alarm System Simulator free?

Fire Alarm System Simulator costs $2.99, with no in-app purchases.

### Do Flat Earth Pro or Fire Alarm System Simulator have ads?

Neither Flat Earth Pro nor Fire Alarm System Simulator shows ads.

### Which is updated more often, Flat Earth Pro or Fire Alarm System Simulator?

Flat Earth Pro ships an update every 6 weeks, and Fire Alarm System Simulator fortnightly. Most recently, Flat Earth Pro was updated on September 25, 2026 and Fire Alarm System Simulator on September 15, 2026.

---

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