Comparison

DIY Sun Science 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

DIY Sun Science

Explore the Sun through hands-on activities and real-time data. This app offers 15 engaging experiments, live solar images from NASA, and educational videos to foster understanding of solar science for families and educators.

Highlights
  • 15 hands-on solar activities
  • Step-by-step instructions
  • Live Sun images from NASA SDO
  • NASA Earth and space observatory images
  • NASA solar videos
  • Learn about solar activity
Features
Read full description

DIY Sun Science is designed to make it easy for families and educators to learn about the Sun anywhere, anytime! The app is developed by UC Berkeley’s The Lawrence Hall of Science, the Children's Creativity Museum, and Sciencenter; funded by NASA. HANDS-ON ACTIVITIES DIY Sun Science includes 15 easy-to-use hands-on activities to learn about the Sun and its important relationship with Earth. Learn how to cook in a solar oven, measure the size of the Sun, or explore shadows in model Moon craters! Each activity includes step-by-step instructions that have been tested by educators, kids, and families. Activity materials are easily available and inexpensive—you may already have many of them in your home! SUN OBSERVATORY Want to see the Sun right now in different wavelengths? Use DIY Sun Science to view live images of the Sun from NASA’s SDO satellite in the Sun Observatory. Afterwards, you can learn more about the solar activity you observed and test your new knowledge. IMAGES AND VIDEOS See awe-inspiring images of the Sun from NASA’s Earth and space observatories! Learn about the different features of the Sun and how scientists are studying it. You can even watch NASA videos of the Sun from the past 48 hours. Praise & Reviews: —Featured by Apple in "Best New Apps" and "Education" —Common Sense Media: “DIY Sun Science is a great way to spark interest in astronomy and inspire learning. The activities are fun and engaging, and they tie in nicely with important astronomy concepts.” —Gizmodo: “A must for budding astronomy enthusiasts.”

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

DIY Sun Science4 screens
Stars Units Sizes Objects4 screens

Verdict

The call

The clearest difference is ads: DIY Sun Science at none against Stars Units Sizes Objects's shown. DIY Sun Science also leads on rating (4.4 vs 4.2) and monetization model (free vs ad-supported). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

DIY Sun Science holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 21 and 5 respectively. Written reviews point the same way: 92% of DIY Sun Science's written reviews are positive against 80% of Stars Units Sizes Objects's.

UpkeepUpdate frequency

DIY Sun Science ships an update every 6 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on June 3, 2026 and September 7, 2026 respectively.

Scorecard5 real differences · 5 level
DIY Sun Science versus Stars Units Sizes Objects: the parameters behind the verdict, then further details
ParameterDIY Sun ScienceStars Units Sizes Objects
PriceFreeFree
Rating4.4 (21 ratings) — better4.2 (5 ratings)
Positive reviews91.7% of reviews — better80.0% of reviews
Number of ratings21 — better5
Update frequencyEvery 6 monthsEvery 4 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size134 MB124 MB
Age rating4+4+
DeveloperThe Lawrence Hall of ScienceMudarmeen Munlin

Customer experience

DIY Sun Science

All ratings21 ratings
Positive85.7%
Neutral4.8%
Negative9.5%
Written reviews24 reviews
Positive91.7%
Neutral4.2%
Negative4.2%

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

None

DIY Sun Science

No in-app purchases

None

Stars Units Sizes Objects

No in-app purchases

Questions

Is DIY Sun Science free?
DIY Sun Science is free to download, with no in-app purchases.
Is Stars Units Sizes Objects free?
Stars Units Sizes Objects is free to download, with no in-app purchases.
Which has better reviews, DIY Sun Science or Stars Units Sizes Objects?
DIY Sun Science is rated higher. DIY Sun Science averages 4.4 out of 5 from 21 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.
Do DIY Sun Science or Stars Units Sizes Objects have ads?
Stars Units Sizes Objects shows ads; DIY Sun Science does not.
Which is updated more often, DIY Sun Science or Stars Units Sizes Objects?
DIY Sun Science ships an update every 6 months, and Stars Units Sizes Objects every 4 months. Most recently, DIY Sun Science was updated on June 3, 2026 and Stars Units Sizes Objects on September 7, 2026.

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