# Stars Units Sizes Objects vs Tuning Fork Study

The clearest difference is price: Stars Units Sizes Objects at Free against Tuning Fork Study's $1.99. Stars Units Sizes Objects also leads on update cadence (every 4 months vs every 37 months). Tuning Fork Study's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Stars Units Sizes Objects is free to download; Tuning Fork Study costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stars Units Sizes Objects ships an update every 4 months, Tuning Fork Study every 37 months. The most recent releases landed on September 22, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Stars Units Sizes Objects | Tuning Fork Study |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 37 months |
| Monetization | Ad-supported | — |
| Size | 124 MB | 224 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## What reviewers say

### Stars Units Sizes Objects

[App page](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571)

Explore the vastness of the universe, from the smallest particles to the largest cosmic structures. Compare object sizes, view detailed images, and perform unit conversions across a wide range of astronomical scales. Learn about stars, galaxies, and the incredible distances between them.

**Highlights:** Compare object sizes, View object images, Pinch/Zoom and Pan images, Unit conversion for distances, Explore scales from Planck length to observable universe, Learn about stars and galaxies

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Stars Units Sizes Objects free?

Stars Units Sizes Objects is free to download, with no in-app purchases.

### Is Tuning Fork Study free?

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

### Do Stars Units Sizes Objects or Tuning Fork Study have ads?

Stars Units Sizes Objects shows ads; Tuning Fork Study does not.

### Which is updated more often, Stars Units Sizes Objects or Tuning Fork Study?

Stars Units Sizes Objects ships an update every 4 months, and Tuning Fork Study every 37 months. Most recently, Stars Units Sizes Objects was updated on September 22, 2026 and Tuning Fork Study on October 10, 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.*