Build a whole alien world in one press: its planet type, landscape, inhabitants, civilization and the hazard that makes it interesting. Free, no signup.
This preset stacks the five things a world needs to be usable rather than merely described: what kind of planet it is, what the ground looks like when you land, who lives there, how they're organised, and what will kill you. One press gives you all five at once, and because each block is a full generator you can reroll the species without losing the planet, or filter the world type to habitable and the hazard to nothing anomalous.
Every result here is drawn using crypto.getRandomValues() -- the Web Crypto API's cryptographically secure randomness -- instead of Math.random(), so it's genuinely unpredictable, not just statistically random. Learn more.
Game masters use it to invent a destination between sessions, when the party has jumped somewhere unplanned and needs a place with stakes rather than a name. Science fiction writers use it as a constraint exercise -- take the five it deals and make them explain each other, which is usually where the story is. It also works as a worldbuilding warm-up: draw five worlds, keep the one that raises the most questions.
Alien Planet Generator · Alien Biome Generator · Alien Species Generator · Alien Civilization Generator · World Hazard Generator
Alien Planet -- Draw a random alien planet from 114 world types -- ocean worlds, tidally locked eyeballs, ringworlds and tomb worlds. Filter by type. Free, no signup.
Alien Biome -- Draw a random alien landscape from 102 terrains -- methane seas, crystal groves, glass deserts and drowned cities. Filter by terrain. Free, no signup.
Alien Species -- Draw a random alien species from 114 biologies -- insectoid hives, silicon lattices, fungal networks and machine successors. Free and no signup.
Alien Civilization -- Draw a random alien civilization from 102 options -- how they rule, how advanced they are, what they believe and how they treat outsiders. Free, no signup.
World Hazard -- Draw a random planetary hazard from 100 options -- corrosive air, active defences, parasitic larvae, time dilation. Filter by kind. Free and no signup.