Life & fun · alternatives · 2026
24 alternatives to AstroCalcul
Learn math by exploring the Solar System. Ad-free & Privacy
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 2 we have checked on their own sites, 2 of them free or with a free tier.
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Atlas of Spacefree▲770Hello HN! Sharing a recent side project of mine, the Atlas of Space, that I built out to explore the Solar System. As a long-time space nerd, I realized recently that I didn't have a good intuition on the scale, speed, and relative orientation of the celestial bodies around us. So over the break I built out a kind of spatial Wikipedia to click around and learn about planets, moons, asteroids, and other bodies orbiting the Sun. The physics is all simulated in the browser using simple Newtonian mechanics. There's a lot left to do from here, including modeling objects in non-Keplerian orbits…
2025 · atlasof.space · its alternatives →
- 2AAAstro App▲291
I really like Stellarium and SkySafari but I felt like these are primarily geared towards exploring the sky but not so much "here are the long list of things I want to see, when can I see them tonight and where". There's also not really a great option I've found that combines sky object planning + location weather details while still being free so I built this. The UI's heavily inspired by NINAs sky atlas + Robinhood. Right now you can: View the altitude chart of objects and 3D view Create lists of objects of interest View the annual max/min daily altitude of an object to find the best…
2024 · astro.sshh.io · its alternatives →
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AstraPixelsfree tier, from $5/mo▲267A pixel-art solar system at its real current positions.
Aug 2026 · astrapixels.com · its alternatives →
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24d ago · space.bl2.net · its alternatives →
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AstroGrid▲113Explore the entire universe in your browser, in real 3D
Apr 2026 · velonspace.com · its alternatives →
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Live NASA solar imagery in 12 wavelengths, the moon phase tonight for 200+ cities, and real space weather. Free on iOS and Android. No ads, no signup.
Apr 2026 · lumara-space.app · its alternatives →
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Interactive 3D space science for curious little minds
Sep 2026 · ninaslittleuniverse.com · its alternatives →
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Create custom star maps, with the stars, planets, Sun and Moon as seen from the locations, dates and times of your choice, and your own design. Download them as transparent PNG to add to your own products, or create unique art with them.
2019 · thestarmaps.com · its alternatives →
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I didn't realize Universe Sandbox ran on MacOS, and I was in the mood to play around a bit. Some functions it's got: - Random system generation - Sonification is super fun too - Habitability Simulation (Just for fun, don't cite this please) - Replacing, spawning, deleting objects I've had tons of fun building this, so I hope someone else can share the joy. It's free and runs in the browser. I'd love to hear any feedback. I think this is at a state where I might leave it as it is, but if people are interested in other features, maybe I'll keep working on it. I've kept saying I'll stop working…
Dec 2025 · luna.watermelonson.com · its alternatives →
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PixelSpace▲68A tediously accurate scale model of the solar system
2014 · joshworth.com · its alternatives →
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I built StellarSnap as a calm, ad-free space to explore NASA’s Astronomy Picture of the Day (APOD) and learn astronomy along the way. What it includes: - A clean APOD archive browser with a Random APOD button - A growing Glossary with term highlighting across the site - A 2D Orbit Simulator where you can test satellite motion with real physics - A deeper Encyclopedia, still early, but expanding - Subtle touches like “see past APODs using this term” - And more to come It’s entirely ad-free, cookie-free, and not affiliated with NASA, but I was honored to have StellarSnap mentioned on the…
2025 · stellarsnap.space · its alternatives →
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Education for toddlers 2-5 yrs
2019 · apps.apple.com · its alternatives →
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Jeff K. Ward — founder and CEO of Animikii. Advocate for Indigenous data sovereignty and equity in AI.
2011 · jeff.io · its alternatives →
- 18AO
Hello HN! My name is Rémy and I recently published an astronomy dashboard where everything is open source: the code of the website, the framework it is based on and the library that computes astronomical data. For the last few years, I have been developing the Ruby library Astronoby (https://github.com/rhannequin/astronoby) with as much dedication and perseverance I could while I don't have any scientific academic background. My end goal was to use this library and build a website that not only provides as much data as possible, but let anyone access and understand how it…
Nov 2025 · its alternatives →
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Premium space exploration in your pocket — free, no ads
May 2026 · play.google.com · its alternatives →
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Sarthium▲6Learning Hub for Coding, Cosmos, Physics all at one place
Dec 2025 · sarthium.com · its alternatives →
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I wanted to find an iPad game where my 5yo could learn math, which sounded simple. Turns out most kids' educational apps are... shady. Notifications, streak mechanics, ads for games definitely not meant for children, coin systems and flashy rewards designed to maximize engagement rather than learning. So I decided to vibe code something for her. The result is Lumi. It's a simple math app with: - No ads, no accounts, no tracking - No notifications - No coins, streaks, or variable reward nonsense - Daily limits (because kids should go play outside) - Works offline, stores everything locally -…
Jan 2026 · playlumi.app · its alternatives →
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An amazing adventure on space to learn..
2016 · play.google.com · its alternatives →
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Learn times tables in a no-ads space arcade for kids
Jun 2026 · play.google.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →