# Mars vs Tuning Fork Study

The clearest difference is price: Mars at Free against Tuning Fork Study's $1.99. Mars also leads on update cadence (every 6 months vs every 37 months). Tuning Fork Study's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Mars is free to download; Tuning Fork Study costs $1.99 up front. Mars sells 1 one-off in-app purchase. Tuning Fork Study asks for nothing beyond the download.

Mars ships an update every 6 months, Tuning Fork Study every 37 months. Both last shipped on November 7, 2026.

## The numbers

| Metric | Mars | Tuning Fork Study |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mars-curiosity/id1549319225/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 months** | Every 37 months |
| Monetization | Ad-supported | — |
| Size | 107 MB | 224 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Alparslan Topbas](https://appshunter.io/developer/1130875171) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## What reviewers say

### Mars

[App page](https://appshunter.io/ios/app/mars-curiosity/id1549319225)

Explore Mars with stunning visuals and interactive features. Discover NASA photos, watch HD videos of Curiosity's journey, and examine 3D models of Martian landscapes and hardware. This app offers a premium, immersive experience for space enthusiasts.

**Highlights:** Browse NASA photos of Mars, Watch HD videos of Curiosity's journey, Interactive 3D models of Martian topography, Smart search and discovery, Cinematic slideshow of Mars imagery, Modern, animated interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Tuning Fork Study

[App page](https://appshunter.io/ios/app/tuning-fork-study-edutech-era/id6444695848)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mars free?

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

### Is Tuning Fork Study free?

Tuning Fork Study costs $1.99, with no in-app purchases.

### Do Mars or Tuning Fork Study have ads?

Mars shows ads; Tuning Fork Study does not.

### Which is updated more often, Mars or Tuning Fork Study?

Mars ships an update every 6 months, and Tuning Fork Study every 37 months. Most recently, Mars was updated on November 7, 2026 and Tuning Fork Study 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.*