Open-source alternatives to Workly

The same DOM API and Frameworks you know, but in a Web Worker.

threads.js is a JavaScript worker thread library and asynchronous task orchestrator designed to offload CPU-intensive tasks to background threads. It functions as a cross-platform worker pool and a TypeScript worker runner that automatically transpiles and executes TypeScript files within separate threads. The project distinguishes itself by providing a unified worker API that allows for cross-platform execution across different JavaScript environments. It includes a specialized worker data serialization tool to pass complex class instances and binary data between threads, and supports inlini

Partytown is a main thread performance optimizer and web worker script orchestrator. It functions as a third party script offloader that relocates resource-intensive external JavaScript from the browser's main thread into a sandboxed web worker environment. The project focuses on improving core web vitals and overall page responsiveness by reducing main thread blocking time. This isolation ensures that heavy third party scripts do not interfere with the execution of core application code and page loading speed. The system provides infrastructure for client-side script offloading through DOM

Greenlet is a multi-threaded asynchronous executor and web worker task runner. It serves as an execution wrapper that offloads heavy computation to background workers to maintain user interface responsiveness and prevent the main execution thread from blocking. The project includes a transferable object handler designed to move large data buffers between threads. This mechanism avoids the overhead of memory copying to optimize data transfer. The library covers the management of web workers, facilitating asynchronous task isolation and main thread offloading.