Mars vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mars
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Humanity’s fascination with the Red Planet has never been stronger. With the completely reimagined "Mars: Curiosity" app, we bring the frontiers of space exploration directly to your fingertips through a premium, state-of-the-art experience. Witness Mars as if you were standing on its dusty plains. Our latest update introduces a stunning modern interface featuring glassmorphism elements, dynamic background animations, and an overall design language inspired by the future of space travel. WHAT’S NEW & REIMAGINED: SMART SEARCH & DISCOVERY: Quickly find exactly what you’re looking for with our new global search feature in both the Browse and Video sections. IMMERSIVE VIDEO EXPERIENCE: Watch Curiosity’s journey in high-definition with our all-new video player. Now supporting landscape mode for a true cinema feel, smart autoplay with preview protection, and an elegant Apple TV-inspired layout. MODERN DESIGN SYSTEM: Experience a "alive" interface with subtle stars animations, glass-like cards, and haptic feedback that makes exploring feel tactile and premium. KEY FEATURES: EXPLORE (BROWSE): Navigate through hundreds of official NASA photos with ease. Toggle between grid and list views, shuffle your findings, and search specifically for the missions that interest you most. CINEMATIC SLIDESHOW: Lose yourself in the Martian landscape. Browse full-screen, high-resolution imagery that makes you feel truly present on the planet. HD VIDEO ARCHIVE: Dive deep into Gale Crater, learn about Curiosity’s historic achievements, and explore over 50 years of Martian research through curated video content. INTERACTIVE GALLERY: Examine every detail with intuitive pinch-to-zoom gestures and high-contrast viewing modes. 3D MODELS: Step into the third dimension with interactive models that bring Martian topography and hardware to life. Whether you are a casual observer or a dedicated space enthusiast, Mars: Curiosity provides a compact, powerful, and visually stunning window into the future of our species on another world.
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 update cadence: Stars Units Sizes Objects at every 4 months against Mars's every 32 months. Stars Units Sizes Objects also leads on iOS requirement (11.0 vs 17.0). On price, ads, 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.
Mars ships an update every 32 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 16, 2026 and September 22, 2026 respectively.
| Parameter | Mars | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.2 (5 ratings) — better |
| Positive reviews | — | 80.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 32 months | Every 4 months — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 108 MB | 124 MB |
| Age rating | 9+ | 4+ |
| Developer | Alparslan Topbas | Mudarmeen Munlin |
In-app purchases
Mars
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Mars free?
Is Stars Units Sizes Objects free?
Do Mars or Stars Units Sizes Objects have ads?
Which is updated more often, Mars or Stars Units Sizes Objects?
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