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We only keep your email and the username you choose. We never share or sell your email, and we don't send marketing — we use it only to email you a sign-in code. Read our privacy policy.

About TerraForge

TerraForge is a planet-building tool and an exoplanet reference, built to make planetary science tangible instead of abstract.

What you can do here

Mix elements, pick a star, add moons, and watch the simulation classify what you've built — rocky, gas giant, water world, and more — then simulate billions of years of evolution in seconds. Save a world and share it with a link, or browse what other people have built.The same engine also renders every planet in the NASA Exoplanet Archive and the Extrasolar Planets Encyclopaedia (exoplanet.eu) that has enough measured data to simulate — thousands of real, confirmed worlds, each built from its actual measured mass, orbit, and star, not a guess.Worlds listed only by the Extrasolar Planets Encyclopaedia are used under CC BY 4.0 (Schneider et al. 2011, A&A 532, A79).

The physics, honestly

The simulation is a model, not a lab: it uses real relationships between mass, density, stellar radiation, and composition to classify a planet, but it simplifies where a full physical simulation would be impractical for something that needs to run instantly in a browser. Where the model and a real exoplanet's own measurements disagree, the page says so rather than quietly picking one over the other — see the note on any exoplanet page.

Built with

Next.js, Three.js, and Space UI.

Who makes it

TerraForge is designed, built and written by Chris West, and published by inkOrange Studios, an independent app and gaming studio. That includes the simulation engine, the Exoplanet Explorer, and the Learn articles explaining how the physics works.inkOrange StudiosTerraForge has no ads, no tracking and no paywall. If you enjoy it, you can support it on Ko-fi.
Love TerraForge? Please help support us.Keeps it ad-free, and funds new features and hosting.

Questions or feedback

Reach out through the contact page, or read the guide for a full walkthrough of the builder.
A dark ringed planet hanging over the horizon of a rocky moon, its rings lit by a distant sun

New: Stand on Your Moons 🌒

A planet's surface view isn't the only ground any more. Press the surface button on a planet with moons and it asks where to stand: the planet itself, or any moon still in orbit, each tagged with what it became — ocean, ice, carbon, volcanic. Every moon gets its own ground and sky from its own physics: airless rock under a black sky, ice cracked by geysers over a hidden sea, sulfur plains shaking with eruptions, or orange haze you can't see the sun through. And hanging over the horizon, there's the planet you built.

Create your free account

Enter your email and we'll send a 6-digit code — no password needed.
We only keep your email and the username you choose. We never share or sell your email, and we don't send marketing — we use it only to email you a sign-in code. Read our privacy policy.

Send feedback

We're still building out the best experience we can — and we'd love your input. Tell us about features you enjoy, ideas you'd like to see, or pain points where something feels off, and we'll know where to look next.

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