webassembly

This post announces the first working version of the Numba JIT compiler running entirely in the browser with JupyterLite and WebAssembly, showing ~250x speedups over standard Python and enabling a full scientific Python stack on static websites.

Oxc packages now run on Cloudflare Workers using the wasm32-wasip1 target, with live demos and deployment instructions.

Cloudflare announces Kitesurf, an agent-first browser that runs entirely on Cloudflare Workers in V8 isolates, designed to be more efficient than Chromium for AI agent tasks like screenshots and HTML extraction. It is available for free in beta in Browser Run.

QRFerry is an open-source browser-based tool that transfers files between two offline devices by encoding data as a live animated QR stream, using RaptorQ fountain coding and WebAssembly.

Weblings is a Rust compiler toolchain compiled to WebAssembly, enabling compilation and execution of Rust code directly in the browser via a web UI with a playground and Rustlings exercises.

agentOS is a 254× cheaper sandbox alternative powered by WebAssembly, designed for secure code execution.

Wasmtime 47 enables Wasm GC and exceptions proposals by default, making it easier for high-level languages with garbage collection and exceptions to target WebAssembly efficiently.

A browser-based tool that runs SQL queries against SQLite and provides plain-English explanations of the query plan and bytecode output.

Puter compiled Firefox to WebAssembly, enabling it to run inside another browser via a WebSocket proxy using the Wisp protocol. The demo, estimated to cost $25,000 in AI tokens, features end-to-end encryption and a public repository.

A web tool that converts Mermaid diagram syntax into ASCII and Unicode box-drawing art, rendered entirely in the browser using a Go library compiled to WebAssembly. Supports flowcharts, sequence diagrams, colors, and customizable output.

Simon Willison built a browser-based tool using WebAssembly to convert Mermaid diagrams into Unicode box art, inspired by an open-sourced Rust component from the Grok CLI coding agent.

Firefox is compiled to run in WebAssembly, using WebGL-based rendering and an experimental JS-to-WASM JIT, with web content proxied through a Puter-hosted Wisp server.

LavenderSim is a Python-first robotics simulation engine with a C++ core and web visualization, built almost entirely by GPT-5.6 Sol. It allows defining environments in Python without XML.

PDFCraft is an open-source PDF toolkit offering over 90 features, running entirely locally in the browser without uploading any files, ensuring data security and free use.

NASA has open-sourced SpaceWasm, a WebAssembly interpreter written in Rust that meets aviation standards, designed for spacecraft onboard environments, supporting streaming decoding and deterministic memory allocation.

The author details the challenges and solution for adding Go as a language to a browser-based code runner (dailyprog), explaining why the standard GOOS=js approach fails in a V8 isolate and how using GOOS=wasip1 with a minimal WASI host shim succeeds.

SpaceWASM is an open-source WebAssembly interpreter from NASA/JPL designed for on-board spacecraft sequencing, with a focus on deterministic memory usage and streaming capabilities for resource-constrained environments.

The article benchmarks the WebAssembly-to-C approach using wasm2c with wide arithmetic support, demonstrating that it remains competitive with dedicated WebAssembly runtimes like Wasmer and Wasmtime in both speed and memory usage.

Nectar is a new web framework that compiles Rust-like code to WebAssembly, eliminating JavaScript dependencies with O(1) signal updates and zero-dependency builds.

KiCad, the open-source PCB EDA suite, is now available in the browser via PCBJam from Emergence Engineering, using WebAssembly, WebGL, and threaded emulation to achieve near-native performance.