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It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
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SpaceSim
Explore the universe
SpaceSim is a free browser-based universe simulator. Travel through a UTC-driven 3D Solar System, inspect source-linked scientific state, observe Earth from a pinned NASA ISS trajectory, build procedural stars, visit compact objects, and collect postcards. Scientific, reconstructed, representative, procedural, experimental, and promotional content are clearly labeled. No signup required.
About SpaceSim on Product Hunt
“Explore the universe”
SpaceSim was submitted on Product Hunt and earned 6 upvotes and 1 comments, placing #84 on the daily leaderboard. SpaceSim is a free browser-based universe simulator. Travel through a UTC-driven 3D Solar System, inspect source-linked scientific state, observe Earth from a pinned NASA ISS trajectory, build procedural stars, visit compact objects, and collect postcards. Scientific, reconstructed, representative, procedural, experimental, and promotional content are clearly labeled. No signup required.
On the analytics side, SpaceSim competes within Education, Space and OpenAI Day — topics that collectively have 87.5k followers on Product Hunt. The dashboard above tracks how SpaceSim performed against the three products that launched closest to it on the same day.
Who hunted SpaceSim?
SpaceSim was hunted by Romain Simon. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of SpaceSim including community comment highlights and product details, visit the product overview.
Hey Hunters (and bots),
I created Spacesim, because I wanted a space simulator that beautiful and fun to explore, while being as scientifically accurate as possible.
What you can explore today:
🌍 Grand tour of the solar system (guided or your can explore from atlas)
🛰 Observe Earth from a NASA-data-backed ISS observer
⭐ Build stars and inspect compact objects in the browser-based stellar laboratory
📋 See my interactive recreation of Luminet's Black Hole rendering from 1979
🎴 Collect postcards for all places in the solar system your visit (while listening original soundtracks per destination
And more more things to come!
I began working on this during OpenAI Build Week and I was mainly built with Codex and GPT-5.6 Sol as a research and engineering partner. All illustrations including postcards are made with GPT Image Pro.
This is a public proof of concept, not a finished scientific platform.
I plan to add much more things (why not the whole universe ?) to have a SpaceEngine but running in the browser.
Please give me some useful feedback!
What should I build next?