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.

Terms of Service

By using TerraForge, you agree to these terms. They're written in plain language on purpose — read the whole thing, it's short.

What TerraForge is

TerraForge is a browser-based tool for designing simulated planets and star systems, and a reference for real, confirmed exoplanets from the NASA Exoplanet Archive and the Extrasolar Planets Encyclopaedia (exoplanet.eu). It's free to use. An account is optional, and only needed to save your own worlds or like other people's.

Your account

You're responsible for what happens under your account. Don't share it, and tell us if you think someone else has access to it. We can suspend or close an account that violates these terms — see "Acceptable use" below.

Planets and systems you create

You own what you build.Saving a planet or system doesn't transfer ownership of your creation to us. What it does do: it grants us a license to store it, display it on the site, and show it to other visitors (in the gallery, on a shared link, in search results) — because that's the whole point of saving one. If you delete a saved world, we remove it from the site; it may persist briefly in backups.A planet or system's name and any description you write are your own words. Keep them civil — see "Acceptable use."

Acceptable use

Don't use TerraForge to post anything illegal, harassing, hateful, sexually explicit, or otherwise abusive — in a planet's name, its description, or in feedback you send us. Don't attempt to disrupt the site (scraping at abusive volume, attacking the builder or its APIs, bypassing rate limits or bot protection), and don't try to access another user's account or data. We can remove content or suspend access for violating this, without notice, at our discretion.

The simulation isn't a scientific instrument

TerraForge models planetary composition, classification, and habitability using real physical relationships, simplified to run instantly in a browser. It is an educational and creative tool, not a peer-reviewed scientific instrument — don't rely on it for anything where the accuracy of a specific number matters. Where our model and a real exoplanet's own published measurements disagree, we say so on that planet's page rather than picking one silently.

No warranty

TerraForge is provided "as is," without warranty of any kind. We don't guarantee it will be available, error-free, or that a saved world will exist forever — back up anything that matters to you by keeping its share link. To the extent the law allows, we aren't liable for damages arising from your use of the site.

Changes

We may update these terms as the site changes. Continuing to use TerraForge after an update means you accept the new terms. We'll update the date below when that happens.

Contact

Questions about these terms? Use the contact page.Last updated September 2026.
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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