NEOscan vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NEOscan
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.
- 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
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This app helps you discover near-Earth objects (NEOs). Filter by their type (asteroid or comet), closest approach time, closest distance, and diameter. For each NEO, the app shows you an Earth-Moon model with the asteroid (or comet) indicated at the proper location. The app also helps you understand the NEO's size by comparing it to a familiar object. The data on NEOs is provided by NASA's Small Body Database (SBDB) and SBDB Close-Approach Data APIs.
Stars Units Sizes Objects
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.
- 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
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Size of the smallest to largest objects and stars. Compare the size of objects in the universe. Object images. Pinch/Zoom image. Pan/Move image. Rotate image. Double tap to reset an image. From the smallest to the largest one. From planck length to observable universe. From Yoctometre, Zeptometre, Attometre, Femtometre, Picometre, Nanometre, Micro, Millimetre, Centimetre, Metre, KiloMetre, Lightyear, Parsecs, Billion Lightyears to 93 Billion Lightyears. Size of objects, particles, atoms, cells, stars and galaxies. Get to know the stars. Get to know the spaces. get to know the universe. How small is this world. How big is the universe. And How great is the creator. How far is the star distance from earth. Two way 18 distance unit conversion. planck length, yoctometer, zeptometer, attometer, femtometer, picometre, nanometre, micrometre, Millimeter, Centimeter, Meter, Kilometer, Inch, Foot, Mile, Astronomical, Lightyear, Parsecs. Perform auto conversion when picker is changed. Share conversion result. Reset unit convertor.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | NEOscan | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (7 ratings) | 4.2 (5 ratings) — better |
| Positive reviews | 50.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 7 — better | 5 |
| Update frequency | Every 12 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 37 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Carlos Anderson | Mudarmeen Munlin |
Customer experience
NEOscan
Stars Units Sizes Objects
In-app purchases
NEOscan
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is NEOscan free?
Is Stars Units Sizes Objects free?
Which has better reviews, NEOscan or Stars Units Sizes Objects?
Do NEOscan or Stars Units Sizes Objects have ads?
Which is updated more often, NEOscan or Stars Units Sizes Objects?
Other comparisons
