Comparison

3D Solar System vs Tortoise Blocks

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

Head to head
About

3D Solar System

Explore our solar system in 3D and augmented reality. Learn about planets, moons, constellations, and stars with interactive maps and engaging quizzes. Create your own planets with AI.

Highlights
  • 3D and AR Solar System exploration
  • Interactive star map with gyroscope support
  • Detailed information on planets, moons, and constellations
  • Knowledge-testing quizzes and challenges
  • AI-powered planet creation
  • Constellation lore and astronomy facts
Features
Read full description

Have you ever wanted to hold the Solar System in your hands? Now you can. 3D Solar System turns your device into a window to the planets, constellations, and stars beyond. Solar System in 3D and AR Travel from the Sun to the icy edge of deep space — a planetary journey of nearly 15 billion kilometers through our cosmic backyard. Study planets, moons, dwarf planets, and two major asteroid fields: the Asteroid Belt between Mars and Jupiter, and the Kuiper Belt beyond Neptune. See how tiny Earth looks next to Jupiter. Zoom in on planets' craters, spin Saturn's rings, and realize just how vast the universe really is. Interactive star map for passionate stargazers A complete map of the night sky with gyroscope support. Tilt your device toward the ceiling and explore constellations like a true space explorer — as if you were standing under a real night sky. Learn each constellation's name, its ancient stories, and the astronomy behind them. Learn to identify Orion, Ursa Major, Cassiopeia and discover dozens more. What you can do: ► Study planets — from scorched Mercury to icy Neptune — along with moons, dwarf planets, and bright constellations like a real astronomer. ► Test your knowledge with quizzes, planet order challenges, "True or False", and mythology questions. Learn who the planets are named after, how long a day lasts on Pluto, and what makes a star shine. ► Create your own planet using AI — design it, name it, and explore it. 714,000+ people have downloaded our app. To put that in perspective: that's 79 times more than all the stars you can see in the night sky with your own eyes. Some features may require a subscription. Free version includes: basic planet info, part of the constellation catalog, some quizzes and tests, star map, and AI planet generation (up to 2 planets). Subscription unlocks: full content about the Solar System, full constellation catalog, all quizzes and tests, planet cross-sections, unlimited AI planet generation. Every planet is different. Each constellation has a story. The universe is waiting — and it's bigger than you ever imagined. Explore all planets, learn every constellation, and become the space explorer you've always wanted to be. Start your journey through space today. Privacy Policy: http://educationterra.com/privacy Terms Of Use: https://educationterra.com/tos

About

Tortoise Blocks

Read full description

Tortoise Blocks is a visual programming app for children. Snap a few blocks together, press play, and a tortoise draws the picture on the canvas — one line at a time, with the block it is drawing lit up in the program. BLOCKS THAT SNAP TOGETHER Move and turn. Put the pen down, pick a color, fill a shape. Drag a block into place or tap to add it, change a number where it sits, and undo anything you like. One tap on the trash can clears the whole program when you want to start over. REPEAT, IF, AND BOXES Run a group of blocks again and again. Ask a question and take one path or the other. Keep a number in a box and add to it as the program runs. These are the ideas real programs are made of, in words a child already knows. BLOCKS YOU MAKE YOURSELF Give a block a name, put whatever you like inside it, and call it by that name from anywhere in the program. A block can call itself, too — and one that calls itself twice, a little smaller each time, draws a tree. There is a ready-made tree to look at before you build your own. ROLL THE DICE Any number — and any color — can be a dice roll instead. The same program then draws a different picture every time it runs, which turns "do it again" into a game of its own. WATCH IT DRAW Play, pause, step forward one command at a time, scrub back and forth, change the speed while it runs. The block being drawn stays highlighted, so it is never a mystery which block made which line. BLOCKS BECOME SWIFT A second pane shows the very same program as real Swift code, colored like an editor and ready to copy. It is waiting there for the day blocks stop being enough. KEEP IT AND SHARE IT Drawings are ordinary documents in Files and Finder, and each one shows its own picture as its icon — so a folder of them reads as a gallery rather than a row of identical squares. Export a drawing as SVG or PNG, or send it through the share sheet. FOR PARENTS AND TEACHERS There is no sign-in and no account. There is nothing to type but numbers. There is no advertising, no analytics, no third-party SDK, and no network connection of any kind — the app contains no networking code at all. Drawings stay on the device and in whatever location you choose to save them. Tortoise Blocks runs on iPad, Mac and Apple Vision Pro — blocks are built on iPad and Mac, and on Vision Pro a finished drawing goes on the table in front of you. It speaks English and Japanese, and is free and open source under the MIT license.

Screenshots

3D Solar System4 screens
Tortoise Blocks4 screens

Verdict

The call

The clearest difference is in-app purchases: Tortoise Blocks at none against 3D Solar System's 10. Tortoise Blocks also leads on ads (none vs shown) and update cadence (weekly vs fortnightly). 3D Solar System's advantage is iOS requirement (16.0 vs 26.0). On price 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. 3D Solar System sells 10 in-app purchases, starting at $9.99 per month. Tortoise Blocks asks for nothing beyond the download.

UpkeepUpdate frequency

3D Solar System ships an update fortnightly, Tortoise Blocks weekly. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
3D Solar System versus Tortoise Blocks: the parameters behind the verdict, then further details
Parameter3D Solar SystemTortoise Blocks
PriceFreeFree
Rating4.4 (1.7K ratings) — better—
Positive reviews28.8% of reviews—
Number of ratings1.7K — better—
Update frequencyFortnightlyWeekly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, Mac, Vision Pro — better
Requires iOS16.0 — better26.0
Further details — not scored
Size352 MB9 MB
Age rating4+4+
DeveloperEducation TerraTomoki Kobayashi

Bugs and requests

3D Solar System

Reported bugs

3 issues
  • Planets displayed incorrectly
  • Subscription charges without consent
  • Inability to cancel subscription

Requested features

4 requests
  • More free content and features
  • Realistic planet models and animations
  • Expanded content beyond the solar system
  • Improved accessibility and usability

Tortoise Blocks

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

3D Solar System

Subscriptions8
  • 1 Month PRO3 Days trial$9.991 Month
  • 1 month Sale2 Months trial$10.991 Month
  • 12 months sale3 Days trial$14.991 Year
Show 5 more
  • Astronomy guide - Sky atlas$19.991 Month
  • 12 months3 Days trial$29.991 Year
  • Astronomy guide - Sky atlas3 Days trial$29.993 Months
  • 2 Month Subscription3 Days trial$39.992 Months
  • 2 Months Subscription3 Days trial$39.992 Months
One-time2
  • Disable Ads Sale$9.99
  • Disable Ads$19.99
None

Tortoise Blocks

No in-app purchases

Questions

Is 3D Solar System free?
3D Solar System is free to download, with in-app purchases available.
Is Tortoise Blocks free?
Tortoise Blocks is free to download, with no in-app purchases.
Do 3D Solar System or Tortoise Blocks have ads?
3D Solar System shows ads; Tortoise Blocks does not.
Which is updated more often, 3D Solar System or Tortoise Blocks?
3D Solar System ships an update fortnightly, and Tortoise Blocks weekly. Most recently, 3D Solar System was updated on November 6, 2026 and Tortoise Blocks on October 31, 2026.

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