Comparison

Solar System 3D vs Number Line, by MLC

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

Head to head
About

Solar System 3D

Explore our solar system in stunning 3D. Navigate through planets, moons, and celestial bodies, accessing detailed Wikipedia information. Experience realistic simulations of Earth's seasons, day-night cycles, and planetary motion.

Highlights
  • 3D space navigation
  • Full solar system model
  • Wikipedia information
  • Spinning and orbiting simulation
  • Earth's seasonal tilt
  • Day-night simulation
  • Real scale factors
Features
Read full description

Solar System 3D is an educational application for anyone interested in our amazing space. Take a journey to our solar system with this app now. Features: - 3D space navigation - Entire solar system with the Sun, 8 major planets and the Moon. - Wikipedia information about each astro - Timer setting with speed up options to learn the spinning and orbiting basics of the solar system - Fantastic simulation of the Earth's seasonal tilt degree and day-night simulation based on your device global location. - Fair clouds, ambient night view and atmosphere simulation for our planet Earth. - Real scale factor on the planet size, spin/orbit speed and distance to sun. In-app purchases: - No Ads - HD Texture and 3D solid surface with shadow projection - Convenient Wallpaper screenshot button to hide the menus and freeze the space from your favorite solar system angle

About

Number Line, by MLC

This app allows students to visualize number sequences and demonstrate mathematical strategies. It supports various number types and offers tools for annotation, problem-solving, and sharing work. Ideal for elementary classrooms and iPad learning environments.

Highlights
  • Visualize number sequences
  • Demonstrate counting, adding, subtracting, multiplying, dividing
  • Use whole numbers, fractions, decimals, or negative numbers
  • Add custom tick marks and labels
  • Hide and reveal numbers and jumps
  • Annotation and drawing tools
  • Save and share work
Features
Read full description

Number Line helps students visualize number sequences and demonstrate strategies for counting, comparing, adding, subtracting, multiplying, and dividing. Choose number lines labelled with whole numbers, fractions, decimals, or negative numbers. Or use a blank number line, with or without tick marks. Describe intervals between points on the line using forward or backward jumps above and below the line. Jumps can be labelled with their values or left blank. Add custom tick marks to the number line to show equivalence or compare number values. Show strategies with drawing and annotation tools. Hide elements of the sequence shown on the number line, which challenges students to use what they know about number relationships and computation to identify those missing elements. This virtual number line is an open-ended educational tool, ideal for elementary classrooms and other learning environments that use iPads. For more Number Line resources and other apps, visit: www.mathlearningcenter.org/apps FEATURES • Mark the number line with multiples of whole numbers, fractions, or decimals. In addition, set the starting value of the line, including using negative values. • Add and manipulate forward and backward jumps, above or below the line. • Label jump bars, manually or automatically, to show intervals or hide labels altogether. • Add custom tick marks and values to blank number lines. • Hide and reveal numbers on the number line. • Hide and reveal jumps, numbers, and other elements with resizable covers to create your own problems and model strategies. • Use the drawing tools to annotate work and show understanding. • Add equations, expressions, and descriptions with the math text and writing tools. • Share your work by saving an image or providing a share code to others. MORE APPS For more Number Line resources and other apps, visit: www.mathlearningcenter.org/apps LEARN MORE To learn about Bridges in Mathematics, an elementary curriculum that employs visual models like number line, visit: www.mathlearningcenter.org/bridges/overview ABOUT US This resource is brought to you by The Math Learning Center, a nonprofit organization dedicated to K-12 education since 1976. ACKNOWLEDGEMENTS This app was crafted by Clarity Innovations. We help improve teaching and learning by creating solutions that match promising technologies with the needs of education. Visit us: www.clarity-innovations.com

Screenshots

Solar System 3D4 screens

Verdict

The call

The clearest difference is rating: Number Line, by MLC at 4.4 against Solar System 3D's 3.7. Number Line, by MLC also leads on in-app purchases (none vs 4). Solar System 3D's advantage is update cadence (every 2 weeks vs every 13 months) and device support (3 vs 1). On price, review sentiment, ratings volume and ads 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. Solar System 3D sells 4 one-off in-app purchases. Number Line, by MLC asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Number Line, by MLC holds the better App Store score, 4.4 against 3.7. Both are backed by a comparable volume of ratings — 31 and 15 respectively. Written reviews complicate that: 68% of Solar System 3D's written reviews are positive against 67% of Number Line, by MLC's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Solar System 3D ships an update every 2 weeks, Number Line, by MLC every 13 months. Both last shipped on November 1, 2026.

Scorecard6 real differences · 4 level
Solar System 3D versus Number Line, by MLC: the parameters behind the verdict, then further details
ParameterSolar System 3DNumber Line, by MLC
PriceFreeFree
Rating3.7 (31 ratings)4.4 (15 ratings) — better
Positive reviews67.9% of reviews — better66.7% of reviews
Number of ratings31 — better15
Update frequencyEvery 2 weeks — betterEvery 13 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS4.3 — better16.1
Further details — not scored
Size54 MB7 MB
Age rating4+4+
DeveloperZHIREN GUANThe Math Learning Center

Customer experience

Solar System 3D

All ratings32 ratings
Positive59.4%
Neutral12.5%
Negative28.1%
Written reviews78 reviews
Positive67.9%
Neutral5.1%
Negative26.9%

Number Line, by MLC

All ratings15 ratings
Positive86.7%
Neutral0.0%
Negative13.3%
Written reviews12 reviews
Positive66.7%
Neutral16.7%
Negative16.7%

In-app purchases

4 purchases

Solar System 3D

One-time4
  • Remove Ads$0.99
  • High Definition Texture$0.99
  • Wallpaper Screenshot$0.99
Show 1 more
  • Special Package Offer$0.99
None

Number Line, by MLC

No in-app purchases

Questions

Is Solar System 3D free?
Solar System 3D is free to download, with in-app purchases available.
Is Number Line, by MLC free?
Number Line, by MLC is free to download, with no in-app purchases.
Which has better reviews, Solar System 3D or Number Line, by MLC?
Number Line, by MLC is rated higher. Solar System 3D averages 3.7 out of 5 from 31 ratings, while Number Line, by MLC averages 4.4 from 15 ratings.
Do Solar System 3D or Number Line, by MLC have ads?
Neither Solar System 3D nor Number Line, by MLC shows ads.
Which is updated more often, Solar System 3D or Number Line, by MLC?
Solar System 3D ships an update every 2 weeks, and Number Line, by MLC every 13 months. Most recently, Solar System 3D was updated on November 1, 2026 and Number Line, by MLC on November 1, 2026.

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