Life & fun · alternatives · 2026
24 alternatives to I built a gravity simulator in pure CSS
A gravity simulator built entirely in CSS that allows users to explore gravitational physics through interactive visualization. The project demonstrates advanced CSS capabilities for creating dynamic animations and… 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 1 we have checked on their own sites, 1 of them free or with a free tier. I built a gravity simulator in pure CSS launched in 2022; newer entries below may have overtaken it.
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Gravity WebGL experiment in the Solar System
2016 · github.com · its alternatives →
- 2GI
Just for fun and self education, I've built this over a weekend to teach myself why orbits exist, not just show planets going around. Something that was never clearly explain to me in school. It opens with a guided tour that builds the idea up step by step: two bodies and the equal/opposite force, inertia (the Sun is removed and Earth just drifts straight), then "an orbit is falling and continuously missing," cosmic velocities with a little rocket, Voyager 1 & 2's real gravity assists (the clock runs the actual 1977–1989 dates so the planets orbit into their grand-tour alignment and the…
Jun 2026 · qunabu.github.io · its alternatives →
- 3IB
Mar 2026 · structuredlabs.github.io · its alternatives →
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A gravity simulator, with updated movement controls
2016 · valentinvichnal.github.io · its alternatives →
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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 →
- 6HO
3D gravity and space Simulator. Explore and play around with the force of gravity in the context of an array of scenarios from our solar system and beyond. You can add planets, delete the Sun, change the value of the gravitational constant or simply lean back and enjoy the dazzling beauty of the pen
2018 · thehappykoala.github.io · its alternatives →
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For HTML Day 2025 [1], I made a web service that displays the current sky at your approximate location as a CSS gradient. Colours are simulated on-demand using atmospheric absorption and scattering coefficients. Updates every minute, without the use of client-side JavaScript. Source code and additional information is available on GitHub: https://github.com/dnlzro/horizon [1] https://html.energy/html-day/2025/index.html
2025 · sky.dlazaro.ca · its alternatives →
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Hello HN! We’re a small creative studio specializing in real-time 3D experiences. Netlify approached us to design and build an interactive experience to celebrate reaching 5 million developers. Inspired by the classic game Marble Madness, we created a gamified experience where users control a ball through playful, interactive levels. The goal was to blend marketing content with the look and feel of a game to engage users. The app is built with Three.js [1], using our custom render pipeline and shaders, and uses Rapier for physics simulation [2]. The 2D content is overlaid on the WebGL view…
2024 · 5-million-devs.netlify.com · its alternatives →
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Renders black hole gravitational lensing effects in an image canvas using WebGL, glfx.js, and numeric.js - cliffcrosland/black-hole.js
2015 · github.com · its alternatives →
- 10A2
2017 · htmlpreview.github.io · its alternatives →
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Features include: - Several preset periodic orbits: the classic Figure-8, plus newly discovered 3D solutions from Li and Liao's recent database of 10,000+ orbits (https://arxiv.org/html/2508.08568v1) - Full 3D camera controls (rotate/pan/zoom) with body-following mode - Force and velocity vector visualization - Timeline scrubbing to explore the full orbital period The 3D presets are particularly interesting. Try "O₂(1.2)" or "Piano O₆(0.6)" from the Load Presets menu to see configurations where bodies weave in and out of the orbital plane. Most browser…
Nov 2025 · trisolarchaos.com · its alternatives →
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2020 · pakastin.github.io · its alternatives →
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Interactive notes for algebra based physics with explorable explanations
2020 · landgreen.github.io · its alternatives →
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Gravity 8▲212Build a SaaS app at warp speed with a Javascript boilerplate
2021 · usegravity.app · its alternatives →
- 15AS
I really like the look of the famous album art for Unknown Pleasures [1]. It was originally created by Harold Craft at the Arecibo Observatory from the signals of the first discovered radio pulsar [2]. I made a spectrogram that produces a similar look. It runs FFT in Rust and visualizes it with WebGL. [1]: https://en.wikipedia.org/wiki/File:UnknownPleasuresVinyl.jpg [2]: https://en.wikipedia.org/wiki/PSR_B1919%2B21
2024 · aestuans.github.io · its alternatives →
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CSS3 animation▲271An experiment with basic CSS3 animations.
2012 · thegoodman.cc · its alternatives →
- 17
A small fun app to test your CSS knowledge. Find the correct CSS selectors for the 10 puzzles as fast as possible.
2022 · css-speedrun.netlify.app · its alternatives →
- 18
Gravity Sketch▲154An app to easily create 3D models by sketching
2016 · gravitysketch.com · its alternatives →
- 19
A prototype implementation of cloth simulation. It uses the soft body dynamics support in ammo.js.
2020 · playcanv.as · its alternatives →
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Interactive Space Physics Sandbox In Your Browser
May 2026 · stellarillusion.com · 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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Sep 2026 · newtonsorchard.app · its alternatives →
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Hi. I’m a high school student studying for my GCSEs. I was using Google Antigravity heavily for my side projects, but I kept hitting the usage limits, and getting random "agent terminated" errors. So I decided to try build my own version of the IDE. I love the UI, so I copied it as accurately as possible, and then hooked up some logic into it, including the INCREDIBLY finicky webcontainer api. I tried to keep it super lightweight, no build steps, or dependencies, and now that its open source, I'm hoping people can build things on top of it that arent possible with closed source tools, like…
May 2026 · github.com · its alternatives →
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Also compare
- gravity.js - Beta alternatives
- Gravity – Interactive solar-system simulator, from Newton to Einstein alternatives
- I built an interactive 3D three-body problem simulator in the browser alternatives
- Gravity WebGL alternatives
- Atlas of Space alternatives
- Harmony of the Spheres – Gravity Simulator alternatives
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 →