A render & execution engine, written in Rust.
Under every bext site is an engine: it compiles TypeScript and JSX, runs your code in a pool of V8 isolates, renders HTML in under a millisecond, caches and isolates — all in a single binary. That technology is what's licensable and embeddable.
Six layers, one binary
Every layer is written from scratch in Rust, built for speed and isolation — with no native dependencies to wire together.
Rust core
An async, GC-free, production server: routing, automatic TLS, compression, ISR. One binary, zero runtime dependencies.
tsc-rs compiler
Our own TypeScript/JSX compiler in Rust — type-stripping + JSX transform. WASM-portable: it runs in the browser too.
V8 isolate pool
Your loaders and components run in shared, supervised V8 isolates — warm, pooled, with a circuit breaker and render budget.
route_css
A Rust Tailwind generator (encre-css) emits exactly the utilities each page uses, at compile time. WASM-portable as well.
Streaming SSR + ISR
Server-first React via PRISM: TTFB streaming, Suspense, incremental static regeneration, cache-key normalization.
Sandbox & security
WAF, rate limiting, per-site isolation, sandboxed execution. Every workload is contained.
Fast where it counts
The same engine runs anywhere — even in a tab
Because the compiler and CSS engine are pure Rust, we compile them to WebAssembly. play.bext.dev is the proof: it compiles and renders real bext code entirely in the browser, using our actual toolchain. Server, edge, CI, browser, agent sandbox — the same engine, everywhere.
Built to drop into your product
The engine is a clean, ownable dependency — not a service to call. Ideal for platforms that need to execute and render generated code, safely and at scale.
Code-gen sandboxes
Compile and run AI-generated code in disposable isolates, with renders measured in milliseconds.
App preview
Give users an instant, live preview of the app an AI just wrote — like our playground.
Agent environments
A contained, fast runtime for agents to build, test, and serve real applications.
Edge & self-host
A single binary to deploy anywhere, or a library to embed — with no external runtime.
Build on it. Or embed it.
Free to run, self-host, and distribute. An OEM license to embed it in your product or AI platform.