Bridge the gap between parser-based narratives and systemic game design. Write living simulations with natural language, managed by a modern ECS, directly in the browser.
Allegory.js reimagines interactive fiction by treating stories as living simulations rather than branching trees.
Simulation-First
World state is managed by a physics/logic simulation, not a narrative tree. Every object, character, and rule exists in a living, reactive world.
Event-Driven
No 60fps game loop. The engine idles until a user input or system event occurs, making it perfect for narrative-focused experiences.
Web-Native
Built on standard TypeScript/ESM. Leverage the browser ecosystem—CSS, WebGL, Web Audio—without proprietary compilers or tools.
Under the Hood
1
ECS Data Model
Entities, Components, and Systems treat your world as a relational database.
2
Semantic NLP
Intent classification via embeddings, not rigid string parsing.
3
Laws & Middleware
Decoupled logic with automatic specificity scoring and conflict resolution.
4
Reactive Event Bus
NPCs and systems respond to world changes, enabling emergent behavior.
example.js
// "Open box", "Lift lid", or "Check chest" all map to this handler automatically:ThereIsAContainer('chest').withCapacity(10).containing('golden-key').onIntent('OPEN',({ entity })=>{if(entity.isLocked){returnFailure("The chest is locked tight.");}returnSuccess("The lid creaks open, revealing treasures within.");});
Blog
From the Blog
Thoughts on interactive fiction, engine architecture, and the craft of game development.
How to Build a Cyberpunk Saloon Without Losing Your Mind
There's one thing most game devs can agree on: **making a game is really damn hard**. It's difficult enough to come up with a cohesive idea for a game; having to translate your vision into engine API…
