Comparison

Universe Size Comparison vs Planetaria

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Universe Size Comparison

Explore the vastness of space and understand celestial body dimensions through interactive 3D comparisons. Discover the scale of planets and stars, from our Sun to hypergiant stars, with guided tours and free comparison modes.

Highlights
  • 3D astronomical comparisons
  • Tour Mode with guided explanations
  • Free Mode for custom comparisons
  • Scale comparisons of planets and stars
  • Detailed celestial body information
  • Elegant user interface
Features
Read full description

Universe Size Comparison is a unique 3D astronomical app that will make you understand the real dimensions of the universe and how small we are. Have you ever wondered how big the Sun is compared to Earth? Or what is the largest planet between Mars and Earth? Do you want to find out the dimensions of some of the most famous stars in the sky like Rigel and Betelgeuse in comparison to our Sun? Do you want to compare everything with the hypergiant star VY Canis Majoris? Universe Size Comparison is the right app for you. The app offers two modes: Tour Mode and Free Mode. Tour mode will guide you on a spectacular journey where you will see planets and stars compared in full scale. All accompanied by simple and clear explanations regardless of the level of knowledge of the subject. The Free mode will allow you to compare two celestial bodies of your choice in scale. You will also find out more information on the bodies you are comparing thanks to an elegant user interface designed to offer the maximum user experience.

About

Planetaria

Explore a dynamic 3D model of the Solar System, synchronizing with real-time data to show celestial bodies in orbit. Discover planets, dwarf planets, and moons with detailed surface models. Manipulate time to view past and future solar system configurations.

Highlights
  • Interactive 3D Solar System model
  • Real-time celestial body positions
  • Detailed 3D surface models
  • Explore planets, dwarf planets, and moons
  • Time manipulation (past/future)
  • AR integration
Features
Read full description

Explore the celestial worlds of the Solar System with Planetaria, an interactive 3D simulator experience for iPhone, iPad, and Apple Vision Pro. This dynamic scale model of the Solar System synchronizes with real-time data to display the live positions of celestial bodies in their orbits, along with beautiful and detailed 3D models of their surfaces. On your journey through outer space, you can visit the Sun, the 8 planets, 5 dwarf planets, and over 20 major moons. Entire worlds await your discovery, each with their own individual features and environments. You can also fast-forward or rewind time, and see what the Solar System looks like at any time in the past or future. Photos and 3D models provided by NASA/JPL.

Screenshots

Universe Size Comparison4 screens
Planetaria4 screens

Verdict

The call

The clearest difference is rating: Planetaria at 4.2 against Universe Size Comparison's 3.2. Universe Size Comparison's advantage is review sentiment (70% vs 50%) and price ($1.99 vs $4.99). On ratings volume, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Universe Size Comparison costs $1.99 and Planetaria $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Planetaria holds the better App Store score, 4.2 against 3.2. Both are backed by a comparable volume of ratings — 30 and 16 respectively. Written reviews complicate that: 70% of Universe Size Comparison's written reviews are positive against 50% of Planetaria's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Universe Size Comparison ships an update every 3 months, Planetaria every 5 months. Both last shipped on November 3, 2026.

Scorecard3 real differences · 7 level
Universe Size Comparison versus Planetaria: the parameters behind the verdict, then further details
ParameterUniverse Size ComparisonPlanetaria
Price$1.99 — better$4.99
Rating3.2 (30 ratings)4.2 (16 ratings) — better
Positive reviews70.0% of reviews — better50.0% of reviews
Number of ratings30 — better16
Update frequencyEvery 3 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, Apple TViPhone, iPad, Vision Pro
Requires iOS17.016.4 — better
Further details — not scored
Size411 MB510 MB
Age rating+44+
DeveloperDaniele CitiJoseph Rupertus

Customer experience

Universe Size Comparison

All ratings30 ratings
Positive46.7%
Neutral20.0%
Negative33.3%
Written reviews10 reviews
Positive70.0%
Neutral30.0%
Negative0.0%

Planetaria

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Universe Size Comparison

No in-app purchases

None

Planetaria

No in-app purchases

Questions

Is Universe Size Comparison free?
Universe Size Comparison costs $1.99, with no in-app purchases.
Is Planetaria free?
Planetaria costs $4.99, with no in-app purchases.
Which has better reviews, Universe Size Comparison or Planetaria?
Planetaria is rated higher. Universe Size Comparison averages 3.2 out of 5 from 30 ratings, while Planetaria averages 4.2 from 16 ratings.
Do Universe Size Comparison or Planetaria have ads?
Neither Universe Size Comparison nor Planetaria shows ads.
Which is updated more often, Universe Size Comparison or Planetaria?
Universe Size Comparison ships an update every 3 months, and Planetaria every 5 months. Most recently, Universe Size Comparison was updated on November 3, 2026 and Planetaria on November 3, 2026.

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