What If Your Imagination
Was the Only Engine You Needed?
The paradigm shift is here
Unreal EngineFirst of Its Kind
Build Entire Games
Just by Describing Them.
The first AI-powered IDE that turns natural language into fully playable worlds running on Unreal Engine. This is real.
Everything you need to go from idea to playable — all in one platform.
Describe a world. Watch it build itself.
Write what you imagine — a haunted castle, a cyberpunk city, a fantasy RPG — and Ocsidian generates every asset, blueprint, and mechanic for you.
See how world building works“Create a medieval village at the base of a snow-capped mountain. Add a blacksmith shop with a working forge, a tavern with ambient firelight, and wandering NPCs with unique dialogue trees.”
AAA fidelity. Zero boilerplate.
Every world Ocsidian creates runs on Unreal Engine — real physics, Lumen lighting, Nanite geometry, and production-grade rendering out of the box.
Explore the engine integrationSpecialized agents build in parallel
Terrain, lighting, characters, game mechanics — each handled by a dedicated AI agent working simultaneously. You direct. They build.
Learn about the agent pipelineGenerated heightmap with erosion simulation. Placed 340 foliage actors across biome zones.
Set up day/night cycle with volumetric fog. Configuring atmospheric scattering...
Created 8 unique NPCs with skeletal meshes and animation blueprints. Rigging complete.
Wired behavior trees for patrol, combat, and idle states. Dialogue system integrated with 42 branching nodes.
Play your world as it's being built
Changes materialize in a live viewport instantly. Hit play at any time to walk through, test mechanics, and iterate without waiting for a single compile.
See the live preview in actionThe new way to build games.
“I described a zombie survival game set in a flooded city. Twenty minutes later I was playtesting it. I still can't wrap my head around that.”
“We used to spend three months on environment art alone. Ocsidian collapses that into a conversation. Our team can finally focus on what makes our game unique.”
“The fact that it outputs real Unreal Engine projects — not some toy sandbox — is what sets it apart. This is professional-grade from day one.”
“I'm a writer, not a programmer. Ocsidian let me build the world I've been imagining for years and actually walk through it. That's never been possible before.”
“We use Ocsidian for rapid prototyping now. Before a single line of production code is written, the entire team can experience the game. It changed how we greenlight projects.”
“Natural language to playable worlds — that's not a feature, it's a paradigm shift. Ocsidian is the most important tool to hit game development in a decade.”
Built different. Built to last.
Powered by Unreal Engine
Lumen global illumination, Nanite geometry, Chaos physics, multiplayer networking — your worlds ship with the same technology behind the biggest AAA titles.
Explore the engine↗Frontier AI that understands creative intent
Ocsidian interprets what you mean, not just what you type. Describe mood, tone, and atmosphere — our models translate creative vision into technical execution.
How our AI works↗Your worlds. Your IP. Always.
Enterprise-grade security from day one. Your projects, assets, and game logic are never used to train models and never leave your control.
Security & privacyChangelog
Ocsidian is an applied research lab at the intersection of artificial intelligence and interactive world creation. We're building the tools that turn imagination into reality.
Join usRecent highlights
Introducing Ocsidian — the world's first AI game creation IDE
How we generate playable Unreal Engine worlds from natural language
From prompt to polygon: how our agent pipeline works
Creators are building things we never imagined — here are the best
Your first world is waiting.
Describe it. Build it. Play it. Start creating for free.