Comparison

Planetary Weather vs Stars Units Sizes Objects

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

Head to head
About

Planetary Weather

Explore real-time weather conditions on planets, moons, and the Sun in a stunning 3D solar system model. Get daily temperature and wind speed forecasts with accurate data.

Highlights
  • Daily temperature and wind speed forecasts
  • Data for planets, moons, and the Sun
  • Accurate estimates from NASA/NOAA
  • Stunning 3D solar system renders
  • Metric or Imperial units
  • High-quality graphics
Features
Read full description

Ever wanted to know today's temperature on Mars, or the current wind speed on Saturn? Now you can! Check out today's average temperature and wind speed on every planet in the solar system, as well as the most important moons and the Sun, all while viewing the solar system in stunning 3D the likes of which you have never seen before on your phone! Features Include: • Daily temperature and wind speed forecasts for all the planets, important moons, the Sun, and of course, Pluto. • Accurate estimates of daily planetary weather conditions based on NASA and NOAA data. • Correct Time of day for earth and lunar phase for our moon • Beautiful 3D renders of the solar system for you to explore • Metric or Imperial units • Among the highest quality graphics you've ever seen in a solar system application.

About

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.

Highlights
  • 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
Features
Read full description

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

Planetary Weather4 screens
Stars Units Sizes Objects4 screens

Verdict

The call

The clearest difference is in-app purchases: Stars Units Sizes Objects at none against Planetary Weather's 2. Stars Units Sizes Objects also leads on rating (4.2 vs 4.0). Planetary Weather's advantage is ads (none vs shown) and review sentiment (100% vs 80%). On price, ratings volume, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Planetary Weather sells 2 one-off in-app purchases. Stars Units Sizes Objects asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Stars Units Sizes Objects holds the better App Store score, 4.2 against 4.0. Both are backed by a comparable volume of ratings — 11 and 5 respectively. Written reviews complicate that: 100% of Planetary Weather's written reviews are positive against 80% of Stars Units Sizes Objects's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Planetary Weather ships an update every 7 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on June 1, 2026 and September 22, 2026 respectively.

Scorecard6 real differences · 4 level
Planetary Weather versus Stars Units Sizes Objects: the parameters behind the verdict, then further details
ParameterPlanetary WeatherStars Units Sizes Objects
PriceFreeFree
Rating4.0 (11 ratings)4.2 (5 ratings) — better
Positive reviews100.0% of reviews — better80.0% of reviews
Number of ratings11 — better5
Update frequencyEvery 7 monthsEvery 4 months — better
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better11.0
Further details — not scored
Size118 MB124 MB
Age rating4+4+
DeveloperTechnospiritsMudarmeen Munlin

Customer experience

Planetary Weather

All ratings11 ratings
Positive72.7%
Neutral9.1%
Negative18.2%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Stars Units Sizes Objects

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

2 purchases

Planetary Weather

One-time2
  • Gas Giants$0.99
  • Moon Pack$1.99
None

Stars Units Sizes Objects

No in-app purchases

Questions

Is Planetary Weather free?
Planetary Weather is free to download, with in-app purchases available.
Is Stars Units Sizes Objects free?
Stars Units Sizes Objects is free to download, with no in-app purchases.
Which has better reviews, Planetary Weather or Stars Units Sizes Objects?
Stars Units Sizes Objects is rated higher. Planetary Weather averages 4.0 out of 5 from 11 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.
Do Planetary Weather or Stars Units Sizes Objects have ads?
Stars Units Sizes Objects shows ads; Planetary Weather does not.
Which is updated more often, Planetary Weather or Stars Units Sizes Objects?
Planetary Weather ships an update every 7 months, and Stars Units Sizes Objects every 4 months. Most recently, Planetary Weather was updated on June 1, 2026 and Stars Units Sizes Objects on September 22, 2026.

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