Life & fun · alternatives · 2026
24 alternatives to A gravity simulator where forces propagate at the speed of light
Real-time 2D gravity sandbox with causal propagation (finite c), GW-strain heatmaps, and a virtual LIGO probe. Numba JIT, CPU-only. - alessandro-pioli/AstroCausal_Engine
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.
- 1IB
2022 · multiplanetary.website · its alternatives →
- 2WI
Special relativity simulator in which light crawls along at a human speed, so Lorentz contraction, aberration and Doppler shift happen at walking pace.
Sep 2026 · rivendell.dmitrybrant.com · its alternatives →
- 3
AstroGrid▲113Explore the entire universe in your browser, in real 3D
Apr 2026 · velonspace.com · its alternatives →
- 4GI
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 →
- 5
Lunar lander type game with computational fluid dynamics - s-macke/Interplanetary-Postal-Service
2018 · github.com · its alternatives →
- 6OI
Things orbital and not.
2016 · orbides.org · its alternatives →
- 7
A gravity simulator, with updated movement controls
2016 · valentinvichnal.github.io · its alternatives →
- 8AS
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 →
- 9
Gravity WebGL experiment in the Solar System
2016 · github.com · its alternatives →
- 10
Odyssey 3▲159A world model that simulates physics in real time
15d ago · odyssey.systems · its alternatives →
- 11
2020 · pakastin.github.io · its alternatives →
- 12
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 →
- 13HO
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 →
- 14
Download Black Hole Vision by Alexandru Lupsasca on the App Store. See screenshots, ratings and reviews, user tips, and more apps like Black Hole Vision.
2024 · apps.apple.com · its alternatives →
- 15
We ported pbrt-v4 to Julia and built it into a Makie backend. Any Makie plot can now be rendered with physically-based path tracing. Julia compiles user-defined physics directly into GPU kernels, so anyone can extend the ray tracer with new materials and media - a black hole with gravitational lensing is ~200 lines of Julia. Runs on AMD, NVIDIA, and CPU via KernelAbstractions.jl, with Metal coming soon. Demo scenes: github.com/SimonDanisch/RayDemo
Feb 2026 · makie.org · its alternatives →
- 16IB
Mar 2026 · structuredlabs.github.io · its alternatives →
- 17A2
2017 · htmlpreview.github.io · its alternatives →
- 18
A prototype implementation of cloth simulation. It uses the soft body dynamics support in ammo.js.
2020 · playcanv.as · its alternatives →
- 19
Pure C# 3D real time physics simulation library, now with a higher version number. - bepu/bepuphysics2
2019 · github.com · its alternatives →
- 20
- 21
I (17y/o) have been developing a rocket launch simulation that allows the user to explore what it's like launching a rocket from earth and putting it into orbit. This idea originally started as an educational simulation but as i've gone more down the rabbit hole the more i've wanted to make it realistic. The problem is that I've never had a formal orbital mechanics class or anything like that so I don't know what I'm missing, what I currently have implemented is: Variable gravity Variable Atmospheric drag (US Standard Atmosphere 1976) Multi-stage rockets Closed-loop guidance /…
Jan 2026 · donutthejedi.com · its alternatives →
- 22
PixelSpace▲68A tediously accurate scale model of the solar system
2014 · joshworth.com · its alternatives →
- 23
A 2D rigid-body dynamics simulator with some cool features for generating beautiful animations. - diegomacario/Dyna-Kinematics
2020 · github.com · its alternatives →
- 24
Hi HN - My name is Andrew, and I'm a high school student. This is a write-up on StratoSpore, a payload I designed and launched to the stratosphere. The goal was to test if we could estimate physical altitude based on algae fluorescence (using a lightweight ML model trained on the sensor data). The blog post covers the full engineering mess/process, including: - The Hardware: Designing PCBs for the AS7263 spectral sensor and Pi Zero 2 W. -The biological altimeter: How I tried to correlate biological stress (fluorescence) with altitude. - The Communications: A custom lossy compression…
Nov 2025 · radi8.dev · its alternatives →
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- OpenGL in super slow motion – visualising Z-buffering 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 →