# ARPlanets 2 vs Stars Units Sizes Objects

The clearest difference is rating: Stars Units Sizes Objects at 4.2 against ARPlanets 2's 3.3. Stars Units Sizes Objects also leads on in-app purchases (none vs 1) and review sentiment (80% vs 57%). ARPlanets 2's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 4 months). On price and device support there is nothing between them.

Both are free to download. ARPlanets 2 sells 1 one-off in-app purchase. Stars Units Sizes Objects asks for nothing beyond the download.

Stars Units Sizes Objects holds the better App Store score, 4.2 against 3.3. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews point the same way: 57% of ARPlanets 2's written reviews are positive against 80% of Stars Units Sizes Objects's.

ARPlanets 2 ships an update every 6 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on September 27, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | ARPlanets 2 | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (15 ratings)](https://appshunter.io/ios/app/arplanets-2/id1387711637/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** |
| Number of ratings | **15** | 5 |
| Positive reviews | 57.1% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 423 MB | 124 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Daniele Citi](https://appshunter.io/developer/1187632258) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### ARPlanets 2

[App page](https://appshunter.io/ios/app/arplanets-2/id1387711637)

Explore the augmented reality Solar System with interactive 3D models and intuitive gestures. Learn basic and advanced astronomy concepts through engaging AR lessons.

**Highlights:** Augmented reality Solar System exploration, Interactive 3D model manipulation, Discover celestial body details, AR-based astronomy lessons, User-friendly interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access AR | $1.99 | 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 ARPlanets 2 free?

ARPlanets 2 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.

### Which has better reviews, ARPlanets 2 or Stars Units Sizes Objects?

Stars Units Sizes Objects is rated higher. ARPlanets 2 averages 3.3 out of 5 from 15 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do ARPlanets 2 or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; ARPlanets 2 does not.

### Which is updated more often, ARPlanets 2 or Stars Units Sizes Objects?

ARPlanets 2 ships an update every 6 weeks, and Stars Units Sizes Objects every 4 months. Most recently, ARPlanets 2 was updated on September 27, 2026 and Stars Units Sizes Objects on September 22, 2026.

---

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