Open-source alternatives to CustomTkinter

Water.css is a minimalist, classless CSS framework and library designed to apply visual improvements directly to standard HTML elements. It maps curated styles to native tags, allowing for clean and professional website interfaces without the need for custom class names. The library features an adaptive theme system that automatically switches between light and dark color schemes based on operating system user preferences. It also uses root-level CSS variables, enabling the customization of base colors and spacing to create unique visual identities. The project provides capabilities for rapi

Kivy is a cross-platform Python GUI framework used to build graphical user interfaces that run on desktop and mobile operating systems from a single codebase. It functions as a multi-touch UI library and a custom widget toolkit, providing a development environment for packaging Python applications into binary installations for Android and iOS. The framework is distinguished by its ability to handle complex multi-touch gestures and interactive input across various devices. It utilizes a specialized domain language for declarative UI construction to separate visual layout definitions from Pytho

Walk is a comprehensive framework for building native Windows desktop applications. It functions as a GUI library and Windows API wrapper, providing a toolkit of native widgets and a declarative layout system for developing high-performance user interfaces. The project is distinguished by its data-binding framework, which uses reflection and string-based property paths to synchronize data sources with interface widgets. It also provides specialized support for high-DPI interface scaling and an optimized native message loop to reduce runtime overhead. The toolkit covers a wide range of capabi

React-admin is a framework for building data-driven administrative interfaces that connect to REST or GraphQL backends. It provides a comprehensive suite of tools for managing the full lifecycle of administrative applications, including resource-oriented routing, declarative form scaffolding, and context-driven state management. By utilizing a modular adapter-based architecture, the framework abstracts backend communication, allowing developers to build consistent CRUD interfaces that handle data fetching, authentication, and synchronization automatically. The project distinguishes itself thr

GitHub-Dark is a browser extension theme and collection of user style sheets designed to provide a comprehensive dark mode aesthetic for the GitHub interface. It functions by injecting custom style rules directly into the browser to override default website colors, fonts, and layout properties, aiming to improve visual comfort and readability during extended use. The project distinguishes itself through its focus on deep integration and visual consistency. It includes specialized support for syntax highlighting across various programming languages and notebook environments, ensuring that code

Tailwind CSS Typography is a plugin for the Tailwind CSS framework that provides hand-tuned typographic defaults for blocks of vanilla HTML content, such as content from Markdown or a CMS. It applies beautiful prose styles to HTML content using a single class, eliminating the need for custom CSS to style rich text. The plugin distinguishes itself by offering deep customization and control over typography. Users can adjust the overall font size of prose content across five predefined sizes, select from five built-in gray-scale palettes to match a project's color scheme, and seamlessly adapt ty

shadcn-svelte is a collection of accessible and customizable user interface elements for Svelte applications. Rather than being distributed as a traditional dependency, these components are provided as source code that is copied directly into the project codebase. The library utilizes a registry-based distribution system, allowing users to install specific UI blocks and components via a command-line interface. This system uses JSON metadata to define dependencies and file paths, while a bootstrapping process automates the configuration of styles and CSS variables. The project integrates Tail

This project is a collection of implementation patterns and source code examples for building desktop applications using various Python interface libraries. It provides reference implementations and architectural patterns for multiple frameworks, including PyQt, PySide, Tkinter, Kivy, and Streamlit. The repository distinguishes itself by offering specialized examples for diverse interface types, ranging from professional desktop software and native windows to reactive web-based data dashboards and data science tools. It includes specific reference material for cross-platform UI patterns, such

Sun-Valley-ttk-theme is a styling library for the Tkinter toolkit that provides a modern visual aesthetic for desktop applications. It functions as a collection of design assets and configuration frameworks that update the appearance of standard interface widgets to align with contemporary design standards. The library enables dynamic switching between light and dark visual modes at runtime, allowing applications to respond to user preferences without requiring a restart. It includes utilities for automatic synchronization with system-level theme settings, ensuring consistent visual presentat

FlatLaf is a Java Swing look and feel library and theme engine that provides a modern flat design for desktop user interfaces. It serves as a comprehensive framework for applying visual themes, managing high-density scaling, and implementing customized window decorations. The project distinguishes itself through a flexible styling system that supports light and dark mode toggling and the ability to define visual identities via property files, subclassing, and external theme imports. It includes a dedicated scaling framework to ensure that interface elements and vector icons remain crisp on Hi

DearPyGui is a hardware-accelerated Python GUI framework and graphics rendering engine. It operates as an immediate mode user interface system, rendering frames from scratch to ensure high performance and minimal state management for desktop applications. The project functions as a GPU-accelerated plotting library capable of rendering millions of data points with high frame rates. It also serves as a node editor toolkit for constructing interactive graph-based interfaces to manage visual data flows. The framework includes capabilities for custom 2D graphics rendering, interface theme customi

Eel is a Python HTML GUI framework designed for building desktop applications that utilize a Python backend and an HTML and JavaScript frontend. It functions as a local web server wrapper that hosts application assets and manages the browser window to provide a user interface. The framework provides a bidirectional Python-JavaScript bridge, allowing functions in either language to call each other in real time. It also includes a desktop application bundler to package Python code and web assets into a standalone executable for distribution. The system covers application window management, loc

Phoenix is a cross-platform Python framework designed for building native desktop graphical user interfaces. It functions as a language binding generator and build automation system, enabling developers to create applications that utilize the underlying operating system's native controls and visual styles. The project provides a mechanism for mapping native C++ graphical toolkit components to Python, allowing for the development of desktop

pywebview is a cross-platform desktop GUI framework for Python that renders HTML, CSS, and JavaScript content using the operating system's native web rendering engine. It enables developers to build desktop applications that run on Windows, macOS, and Linux from a single Python codebase, with the web frontend displayed in a lightweight, native window. The framework provides a bidirectional JavaScript-Python bridge for real-time data exchange between frontend and backend, along with the ability to manipulate the Document Object Model directly from Python without writing JavaScript. It includes

KittenTricks is a cross-platform mobile starter kit and UI library for building applications for iOS and Android. It provides a foundational set of production-ready, accessible components and pre-built screens to accelerate the bootstrapping of mobile interfaces. The project features a dynamic mobile theming system that allows for the management and switching of light and dark color schemes at runtime. This framework enables real-time updates to the visual appearance of the interface without requiring an application restart. The library implements a comprehensive design system to ensure visu

Flet is a cross-platform framework that enables developers to build interactive desktop, mobile, and web applications using only Python. By utilizing a declarative programming model, it allows for the construction of complex user interfaces through a hierarchical structure of components, removing the need for specialized knowledge of web-specific languages like HTML, CSS, or JavaScript. The framework distinguishes itself by offloading visual rendering to a high-performance graphics engine while maintaining application logic within a centralized server-side environment. This architecture synch

This project is a cross-platform media downloader and graphical user interface wrapper for the youtube-dl command-line tool. It provides a desktop application for fetching audio and video from websites through a visual interface. The application is implemented as a wxPython desktop application, utilizing the wxPython toolkit to provide a windowed environment. It functions as a wrapper that maps visual form inputs to command-line arguments for the underlying backend utility.

This project provides instructional and reference materials for C++ development, focusing on the Qt framework. It serves as a guide and example library for network programming, cross-platform builds, multithreaded execution, and GUI customization. The collection features specialized patterns for building user interfaces and customizing widgets through custom painting and styling. It also provides a reference for implementing client-server communication and managing concurrent tasks using synchronization primitives. The project covers a broad range of capabilities, including cross-platform ap

PySimpleGUI is a Python framework used to build graphical user interfaces. It functions as an adapter-based wrapper that maps multiple GUI toolkit APIs into a single unified interface, allowing for backend-agnostic development across tkinter, Qt, or WxPython. The project uses a layout-based UI definition system where visual hierarchies are defined via nested lists rather than coordinate-based placement. It employs an event-driven polling loop and string-based event mapping to associate interface elements with specific user actions. The framework supports cross-framework GUI design and intera

Carbon is an enterprise design system that provides a comprehensive collection of reusable UI components, design tokens, and guidelines for building professional web applications. It functions as a CSS framework that enforces a unified design language across projects through standardized typography, spacing, and color palettes. The system utilizes a platform-agnostic design token system to maintain visual consistency across different technologies. This includes centralized management of brand colors, motion easing curves, and a curated library of accessible SVG icons. The framework covers a

Druid is a native user interface toolkit and 2D graphics engine for the Rust programming language. It functions as a retained-mode, data-driven framework for building graphical user interfaces that run across Linux, macOS, and web browsers via WebAssembly. The toolkit distinguishes itself through a data-first approach to UI design, utilizing lenses to isolate subsets of global application state and synchronize them with specific widgets. This allows the visual layout to update automatically when the underlying data model changes. Its capability surface includes a constraint-based box layout

Toga is a cross-platform application framework and native GUI toolkit for Python. It serves as a multi-platform frontend wrapper that allows a single codebase to be deployed across macOS, Windows, Linux, Android, and iOS. The toolkit functions as a native widget UI library, mapping high-level Python interface definitions directly to the host operating system's own visual components. This ensures that applications use native system widgets to match the look and feel of the target environment rather than relying on custom drawing libraries. The framework covers cross-platform development for d

This project is a cross-platform UI framework and native desktop GUI library. It provides a unified set of instructions to render native windows, forms, and layouts across different operating systems by mapping high-level instructions to the native widgets and controls of the host environment. The toolkit includes a vector graphics engine for rendering custom shapes, gradients, and high-density images using brushes and matrices. It also serves as a native dialog provider for system-level operations such as file path selection and message box alerts. The library covers a broad range of GUI co

Pywal is an image-based theme engine and dynamic color scheme generator that extracts dominant colors from images to create coordinated system-wide color palettes. It functions as a cross-application theme synchronizer and terminal color palette manager, updating interface colors and environment configurations in real-time. The system synchronizes generated palettes across third-party software, window managers, and supported hardware, including RGB backlight controllers for keyboards and laptops. It integrates wallpaper management by applying a source image as the system background while simu

Termui is a Go terminal user interface library used for building interactive dashboards and visual layouts within a command-line environment. It functions as a TUI layout engine, an interactive CLI framework, and a terminal data visualization toolkit. The library provides a set of specialized widgets for rendering charts, plots, gauges, and tables using character-based graphics. It includes a grid-based system for arranging interface elements using relative coordinates and proportional sizing to create structured displays. The toolkit covers a broad range of capabilities including data visua

Ant Design is an enterprise-grade component library and design system framework built for developing complex, data-heavy web applications. It provides a comprehensive collection of pre-built, state-driven interface elements that map data properties to rendered components, ensuring consistent interaction patterns and visual language across large-scale projects. The library distinguishes itself through a robust styling architecture that utilizes design tokens and hierarchical configuration providers to propagate global settings like themes, locale, and layout direction. By employing component-l

This project provides a framework for building native graphical user interfaces that run consistently across desktop and mobile operating systems. It functions as a bridge that allows developers to construct complex application layouts and render high-performance visual elements by utilizing a native C++ widget toolkit. The framework enables the creation of responsive user interfaces through both traditional widget-based components and declarative markup languages. It employs a decoupled messaging system to connect interface components and uses a pre-compilation step to manage object introspe