# Moon phases assist vs Flat Earth Pro

The clearest difference is price: Moon phases assist at Free against Flat Earth Pro's $3.99. Flat Earth Pro's advantage is rating (4.9 vs 3.5) and ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.

Moon phases assist 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.

Flat Earth Pro holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: Flat Earth Pro has 122 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 67% of Moon phases assist's written reviews are positive against 81% of Flat Earth Pro's.

Moon phases assist ships an update every 3 weeks, Flat Earth Pro every 6 weeks. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Moon phases assist | Flat Earth Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/moon-phases-assist/id1070111214/reviews) | **[4.9 (122 ratings)](https://appshunter.io/ios/app/flat-earth-pro/id1664580677/reviews)** |
| Number of ratings | 2 | **122** |
| Positive reviews | 66.7% of reviews | **81.3% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Ad-supported | **Free** |
| Best chart rank | — | **#182** |
| Size | 64 MB | 224 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Plus Inc. (Japan)](https://appshunter.io/developer/445792061) | [Othman Alzahrani](https://appshunter.io/developer/1664580679) |

## What reviewers say

### Moon phases assist

[App page](https://appshunter.io/ios/app/moon-phases-assist/id1070111214)

Visually learn about moon phases and celestial body positions. Interactive diagrams help answer questions about why the moon changes appearance and how the sun's height varies with seasons. Understand the solar system through intuitive overhead and celestial sphere views.

**Highlights:** Visual moon phase learning, Celestial body position diagrams, Interactive dial for position checking, Answers to astronomy questions, Overhead and celestial sphere views, Improved features through overhaul

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

**In-app purchases:** none


### Flat Earth Pro

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

**Currently charting:** #182 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


## Frequently asked questions

### Is Moon phases assist free?

Moon phases assist is free to download, with no in-app purchases.

### Is Flat Earth Pro free?

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

### Which has better reviews, Moon phases assist or Flat Earth Pro?

Flat Earth Pro is rated higher. Moon phases assist averages 3.5 out of 5 from 2 ratings, while Flat Earth Pro averages 4.9 from 122 ratings.

### Do Moon phases assist or Flat Earth Pro have ads?

Moon phases assist shows ads; Flat Earth Pro does not.

### Which is updated more often, Moon phases assist or Flat Earth Pro?

Moon phases assist ships an update every 3 weeks, and Flat Earth Pro every 6 weeks. Most recently, Moon phases assist was updated on November 2, 2026 and Flat Earth Pro on November 7, 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.*