# NEOscan vs Stars Units Sizes Objects

The clearest difference is rating: Stars Units Sizes Objects at 4.2 against NEOscan's 2.7. Stars Units Sizes Objects also leads on review sentiment (80% vs 50%) and update cadence (every 4 months vs every 12 months). NEOscan's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Stars Units Sizes Objects holds the better App Store score, 4.2 against 2.7. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews point the same way: 50% of NEOscan's written reviews are positive against 80% of Stars Units Sizes Objects's.

NEOscan ships an update every 12 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 | NEOscan | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (7 ratings)](https://appshunter.io/ios/app/neoscan/id1384305727/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** |
| Number of ratings | **7** | 5 |
| Positive reviews | 50.0% of reviews | **80.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 4 months** |
| Monetization | **Free** | Ad-supported |
| Size | 37 MB | 124 MB |
| Requires iOS | **8.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Anderson](https://appshunter.io/developer/1095157042) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### NEOscan

[App page](https://appshunter.io/ios/app/neoscan/id1384305727)

Explore near-Earth objects like asteroids and comets. Visualize their positions relative to Earth and the Moon, and understand their sizes through familiar comparisons. Data is sourced from NASA's Small Body Database.

**Highlights:** Discover asteroids and comets, Filter by type, approach time, distance, and diameter, Earth-Moon model visualization, Size comparison to familiar objects, Data from NASA's Small Body Database

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 NEOscan free?

NEOscan is free to download, with no in-app purchases.

### Is Stars Units Sizes Objects free?

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

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

Stars Units Sizes Objects is rated higher. NEOscan averages 2.7 out of 5 from 7 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

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

Stars Units Sizes Objects shows ads; NEOscan does not.

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

NEOscan ships an update every 12 months, and Stars Units Sizes Objects every 4 months. Most recently, NEOscan 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.*