NOVA Black Hole Apocalypse vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NOVA Black Hole Apocalypse
Guide a star through spacetime, navigating cosmic hazards to become a black hole. After playing over 50 levels, watch a documentary on black holes hosted by an astrophysicist.
- Over 50 levels
- Stellar evolution simulation
- Cosmic hazard navigation
- Black hole formation
- Accompanying documentary
- Astrophysicist-hosted content
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Start with a star and play over 50 levels to watch it become a black hole. Hurl your star across spacetime to hit your target. Navigate fields of cosmic objects and hazards—like neutron stars and quasars—avoiding some and slingshotting around others in your quest to become more massive. Reach the end and your star collapses….to become a black hole. Then watch the two-hour NOVA program, “Black Hole Apocalypse,” hosted by astrophysicist Janna Levin.
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 4.3 against NOVA Black Hole Apocalypse's 3.5. Stars Units Sizes Objects also leads on review sentiment (80% vs 50%) and update cadence (every 4 months vs every 10 months). NOVA Black Hole Apocalypse's advantage is ads (none vs shown) and monetization model (free vs ad-supported). 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.
Stars Units Sizes Objects holds the better App Store score, 4.3 against 3.5. That said, the two scores are not equally well evidenced: NOVA Black Hole Apocalypse has 54 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 50% of NOVA Black Hole Apocalypse's written reviews are positive against 80% of Stars Units Sizes Objects's.
NOVA Black Hole Apocalypse ships an update every 10 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | NOVA Black Hole Apocalypse | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (54 ratings) | 4.3 (6 ratings) — better |
| Positive reviews | 50.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 54 — better | 6 |
| Update frequency | Every 10 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 | 9.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 372 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | PBS | Mudarmeen Munlin |
Customer experience
NOVA Black Hole Apocalypse
Stars Units Sizes Objects
In-app purchases
NOVA Black Hole Apocalypse
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is NOVA Black Hole Apocalypse free?
Is Stars Units Sizes Objects free?
Which has better reviews, NOVA Black Hole Apocalypse or Stars Units Sizes Objects?
Do NOVA Black Hole Apocalypse or Stars Units Sizes Objects have ads?
Which is updated more often, NOVA Black Hole Apocalypse or Stars Units Sizes Objects?
Other comparisons
