Ascent vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ascent
Explore stunning Shuttle mission footage with commentary, additional scenes, and production notes. This educational compilation offers a deep dive into the STS-114, STS-117, and STS-124 missions.
- Ground-based Shuttle motion imagery
- STS-114, STS-117, and STS-124 mission footage
- Includes commentary
- Additional scenes
- Selected images
- Production notes
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Ascent is a compilation of film and video representing the best of the best ground based Shuttle motion imagery from the STS-114, STS-117, and STS-124 missions. This app includes the entire Ascent production with commentary, numerous additional scenes, selected images, and production notes.
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 ads: Ascent at none against Stars Units Sizes Objects's shown. Ascent also leads on rating (4.6 vs 4.2) and monetization model (free vs ad-supported). Stars Units Sizes Objects's advantage is update cadence (every 4 months vs every 46 months) and device support (3 vs 1). On price and in-app purchases 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.
Ascent holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 16 and 5 respectively. Written reviews point the same way: 89% of Ascent's written reviews are positive against 80% of Stars Units Sizes Objects's.
Ascent ships an update every 46 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 13, 2026 and September 22, 2026 respectively.
| Parameter | Ascent | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (16 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 89.5% of reviews — better | 80.0% of reviews |
| Number of ratings | 16 — better | 5 |
| Update frequency | Every 46 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 731 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | NASA | Mudarmeen Munlin |
Customer experience
Ascent
Stars Units Sizes Objects
In-app purchases
Ascent
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Ascent free?
Is Stars Units Sizes Objects free?
Which has better reviews, Ascent or Stars Units Sizes Objects?
Do Ascent or Stars Units Sizes Objects have ads?
Which is updated more often, Ascent or Stars Units Sizes Objects?
Other comparisons
