# Solary vs Stars Units Sizes Objects

The clearest difference is in-app purchases: Stars Units Sizes Objects at none against Solary's 3. Stars Units Sizes Objects also leads on update cadence (every 4 months vs every 30 months) and iOS requirement (11.0 vs 14.0). Solary's advantage is ads (none vs shown) and review sentiment (100% vs 80%). On price and device support there is nothing between them.

Both are free to download. Solary sells 3 one-off in-app purchases. Stars Units Sizes Objects asks for nothing beyond the download.

Solary ships an update every 30 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 2, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Solary | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | **100.0% of reviews** | 80.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 30 months | **Every 4 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 109 MB | 124 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gyorgy Borz](https://appshunter.io/developer/1491605324) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### Solary

[App page](https://appshunter.io/ios/app/solary/id1517004737)

Explore our solar system in augmented reality. View individual planets or the entire system in orbit. Interact with celestial bodies by rotating, scaling, and repositioning them. Enhance your experience with a galaxy background.

**Highlights:** Augmented reality solar system exploration, View individual planets or the full system, Interactive planet controls (rotate, scale, move), Adjustable rotation animations, Galaxy background option

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip | $0.99 | one-time |
| Big tip | $1.99 | one-time |
| Giant tip | $2.99 | one-time |


### 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


## Frequently asked questions

### Is Solary free?

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

### Is Stars Units Sizes Objects free?

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

### Do Solary or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; Solary does not.

### Which is updated more often, Solary or Stars Units Sizes Objects?

Solary ships an update every 30 months, and Stars Units Sizes Objects every 4 months. Most recently, Solary was updated on October 2, 2026 and Stars Units Sizes Objects on September 22, 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.*