Eel

Eel is a framework for creating desktop applications using a Python backend and a web-based frontend. It acts as a bidirectional bridge between Python and JavaScript, allowing developers to build graphical user interfaces with HTML and JavaScript that communicate with local system logic.

The project facilitates two-way communication by enabling the exposure of Python functions to the browser and allowing the backend to trigger JavaScript functions. It uses a local server to render web interfaces as standalone desktop windows and provides tools to bundle the Python code and web assets into a single standalone binary executable for distribution.

The framework covers application window management, desktop interface rendering, and data exchange using both synchronous and asynchronous communication patterns.

Features

Browser-Based Desktop UIs - Uses a web browser as the primary rendering engine for a standalone desktop application interface.

Standalone Binary Packaging - Bundles the Python interpreter and application source into a single standalone executable binary.

Python Application Packagers - Packages Python code and web assets into a single standalone native executable binary.

Language Runtime Bridges - Establishes a two-way bridge to call Python functions from JavaScript and vice versa.

Local HTTP Servers - Includes a built-in local HTTP server to serve frontend web assets to the browser window.

Cross-Language Bridges - Provides a bidirectional bridge allowing Python and JavaScript to call each other's functions.

Host Function Exposure - Exposes Python functions to the browser, enabling the frontend to execute backend logic.

JavaScript Function Invocations - Allows the Python backend to trigger JavaScript functions to update the user interface.

Python-JavaScript Bridges - Implements a bidirectional communication layer for mapping function calls between Python and JavaScript.

Backend GUIs - Creates web-based graphical user interfaces that communicate with a local Python backend.

Web-Based Interfaces - Enables the creation of desktop user interfaces using web technologies connected to a Python backend.

Python GUI Frameworks - Framework for creating desktop applications combining a Python backend with an HTML/JS frontend.

Backend-Frontend Bridges - Uses a persistent WebSocket connection as the communication layer between Python and JavaScript.

Desktop Development - Provides a framework for building desktop applications using Python logic and web-based UIs.

Local Web App Hosting - Hosts a local server to serve web assets and render them within a standalone desktop window.

Asynchronous Callbacks - Supports passing callback functions to handle cross-process return values without blocking execution.

Synchronous Request-Response - Enables retrieving values from another process by pausing execution until the result is received.

Standalone Application Packaging - Bundles web frontends and Python backends into single-file binaries to remove runtime dependencies.

GUI Frameworks - Library for building offline HTML/JS desktop apps.

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Features

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