Open-source alternatives to Uni App

Chameleon is a cross-platform application framework and component library used to develop applications for the web and various mini-app platforms from a single shared codebase. It functions as a multi-platform build pipeline that compiles source code into different target formats while providing an MVVM-based user interface system for managing application state. The framework employs a polymorphic protocol to extend custom components and APIs, allowing for platform-specific implementations while maintaining cross-end compatibility. It includes a specialized build tool for static analysis that

Taro is a cross-platform application development framework designed to build a single codebase that runs across multiple mobile platforms and web browsers. It focuses on mini-program development for ecosystems such as WeChat, Alipay, and ByteDance, as well as hybrid mobile application deployment. The project enables multi-framework frontend engineering, allowing developers to use React or Vue to create user interfaces that compile to different target environments. It employs a framework-agnostic abstract layer and a unified virtual DOM translation to map high-level component logic to various

This project is a development framework that enables the creation of cross-platform mobile mini programs using the component-based architecture and reactive data binding of Vue.js. It functions as a build system that transforms web-oriented component code into native-compatible templates and logic, allowing developers to build modular user interfaces that run within restricted mobile environments. The framework distinguishes itself through a sophisticated build pipeline that deconstructs single-file components into platform-specific templates, logic, and style files. It employs compile-time t

LibGDX is a Java-based framework designed for cross-platform game development, enabling the creation and deployment of 2D and 3D games across desktop, mobile, and web environments from a single codebase. It functions as a comprehensive library that abstracts hardware-accelerated graphics, audio, input, and file system access, providing a unified interface for developers to manage game logic and application lifecycles. The framework distinguishes itself through a high-performance architecture that prioritizes efficiency and native interoperability. It utilizes a batch-oriented graphics pipelin

Ionic Framework is a cross-platform UI toolkit and hybrid app framework used to build native-quality mobile and progressive web applications using HTML, CSS, and JavaScript. It functions as a web component library that enables the deployment of a single codebase across iOS, Android, and the web. The framework features a platform-adaptive design system that automatically switches the visual style of components to match the design patterns of the host operating system. It utilizes a web-component-based architecture with CSS custom properties for global theming and specialized bindings to synchr

This is a comprehensive library of code examples and reference implementations for building cross-platform user interfaces with Flutter. The project provides a collection of demo applications and guides designed to illustrate the implementation of design patterns, animation techniques, and testing workflows. The repository features specific demonstrations for native integration, including examples of embedding modules into existing native applications, using platform channels, and bridging native code with the framework. It also serves as an animation reference, providing implementations for

This project provides a collection of type-safe wrappers designed to bridge web-based applications with native mobile hardware and system services. It functions as a cross-platform framework that normalizes disparate native plugin behaviors into a unified interface, allowing developers to access device sensors and system capabilities consistently across multiple mobile operating systems. The framework distinguishes itself by wrapping asynchronous native callbacks into reactive streams, simplifying the management of continuous hardware events and data updates. It includes robust mocking capabi

nativescript-vue is a framework for building native iOS and Android applications using Vue components and a reactive state system. It functions as a cross-platform mobile UI library that renders platform-specific views instead of web views, utilizing a native mobile application bridge to connect Vue logic to NativeScript APIs for direct access to mobile hardware and OS features. The framework employs a reactive mobile component system to create high-performance screens and dynamic lists with automatic state updates. This architecture allows for the development of native mobile applications fr

This project is an Android hybrid mobile framework that enables the development of applications running web content inside a native Android container. It functions as a cross-platform build system that packages shared web assets into native binaries, allowing developers to access device hardware and system APIs via JavaScript. The framework utilizes a native device API bridge and a plugin architecture to expose hardware sensors and system-level functionality not available through standard browser interfaces. It employs a manifest-driven orchestration system to manage application metadata, bra

This framework is a cross-platform software development kit designed for building native mobile and desktop applications from a single shared codebase. It provides a unified programming interface that allows developers to construct user interfaces using declarative markup, which are then rendered as native components on each target operating system. The framework distinguishes itself through a multi-targeting build system that consolidates platform-specific resources and native control mapping into a unified project structure. It includes a data-driven binding engine that synchronizes applica

Expo is a universal mobile framework designed to build native iOS and Android applications from a single codebase using web-standard technologies. It provides a comprehensive development environment that includes a unified runtime for testing, cloud-based infrastructure for compiling and signing native binaries, and automated tools for managing the entire mobile release lifecycle, including app store submission. The framework distinguishes itself through a plugin-based native configuration engine that programmatically modifies project files, allowing developers to integrate native modules wit

f8app is a cross-platform mobile reference application implementation that serves as a technical architecture guide for building complex features in a production environment. It is built as a React Native mobile application using a component-based architecture to manage the user interface and application state. The project implements a dockerized backend environment, running a database, server, and dashboard as a group of coordinated containers to ensure consistent development environments. It further integrates a GraphQL data fetching system that uses a structured schema and compiler to ensu

React is a JavaScript library for building user interfaces based on a component-driven architecture and unidirectional data flow.

Ionic is a cross-platform mobile UI toolkit and hybrid app development framework. It provides a library of web components for building native-quality iOS, Android, and Progressive Web Apps using HTML, CSS, and JavaScript from a single codebase. The project utilizes a web component UI library to ensure consistent mobile interface behaviors. It employs a framework-agnostic wrapper to integrate these custom elements with JavaScript libraries such as React, Vue, and Angular. The toolkit covers hybrid mobile UI design and cross-platform app development. It includes an adaptive styling system that

Shizuku is a framework that enables standard mobile applications to interact with restricted system-level interfaces and services. By acting as a bridge between the user space and protected system functions, it allows applications to perform privileged operations that are typically inaccessible due to standard operating system sandbox limitations. The project functions by routing requests through a persistent background service, which facilitates communication with internal system services and remote interfaces. This architecture allows for the execution of system-level tasks and the manageme

react-native-maps is a cross-platform map component and visualization library for embedding interactive maps within mobile applications on iOS and Android. It provides a declarative interface for managing geospatial user interfaces, allowing for the rendering of geographical data and location-based features. The library enables the visualization of spatial data through the placement of markers, the creation of custom callouts, and the drawing of polylines and polygons as map overlays. It supports interactive map navigation, including the ability to animate map regions and customize the visual

This project is a collection of practical implementation examples and demonstrations for building mobile applications using a JavaScript-based native framework. It serves as a cross-platform mobile framework demo, providing a gallery of interactive interface patterns and native integration suites. The repository showcases specialized capabilities including high-performance 2D and 3D visual content through OpenGL graphics implementation. It also features a suite of native hardware integrations, covering biometric authentication via fingerprint scanning and gesture-based unlock patterns. The p

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 development framework and application boilerplate designed to build mobile, desktop, and web applications from a single shared codebase. It functions as a React Native development tool, utilizing declarative components to render platform-specific user interfaces while maintaining consistent business logic across all supported environments. The framework distinguishes itself by centralizing core application rules and data management, ensuring identical functional results regardless of the target device. It employs a build-time file resolution system that allows

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

AsyncDisplayKit is an asynchronous UI framework and performance library for iOS. It provides a collection of performant alternatives to standard views, allowing developers to build responsive interfaces by offloading layout and rendering tasks to background threads. The framework is centered around a declarative layout engine based on a flexbox model, which calculates element positions and sizes asynchronously. It utilizes a node-based abstraction to wrap native views, enabling the instantiation and configuration of UI hierarchies on background threads to prevent main thread blocking. The sy

Expensify App is a cross-platform collaborative expense management platform that combines receipt capture, expense tracking, and shared bill splitting for groups and teams. Designed as an offline-first application, it applies user actions optimistically to local state and queues them for server synchronization, with automatic rollback if the server rejects an operation. The application is built on a reactive client-side key-value store called Onyx that broadcasts changes to subscribed components and persists data to disk for offline access. Its cross-platform TypeScript and React codebase com

WinObjC is an implementation of the Objective-C language runtime and object model for the Windows operating system. Its primary purpose is to enable the execution of Objective-C code and iOS APIs on Windows to support the porting of iOS applications. The project features a native API bridge that maps Objective-C system framework calls to native Windows API functions. It includes a toolchain to convert Xcode project targets and workspaces into Visual Studio formats and translates visual storyboard design files into active on-screen interface elements. The codebase covers binary interoperabili

Stencil is a compiler used for authoring web component libraries and developing framework-agnostic user interface elements. It transforms TypeScript and JSX source code into standard custom elements that operate natively in the browser. The project enables the implementation of design systems and enterprise component systems by sharing a single codebase across different JavaScript frameworks. It generates specific adapter layers that allow these custom elements to be used as native components in React, Angular, and Vue. The toolset incorporates ahead-of-time compilation to minimize bundle si

Leafer UI is a high-performance HTML5 canvas rendering engine and 2D vector graphics library. It utilizes a hierarchical scene tree to manage shapes, paths, and text, providing a toolkit for building interactive canvas applications and expansive infinite canvases. The engine is designed as a cross-platform canvas toolkit that decouples core logic from the drawing API, allowing it to run across web, mobile, server, and mini-program environments. It distinguishes itself by providing specialized tools for interactive graphic editor development, including hit detection, event bubbling, and transf

Solid is a declarative JavaScript framework for building user interfaces through fine-grained reactivity. By utilizing a compile-time template transformation process, it converts JSX into direct DOM manipulation instructions, eliminating the need for a virtual tree. This architecture allows the framework to track dependencies at the individual element level, ensuring that state changes trigger surgical updates to the interface. The framework distinguishes itself through its isomorphic rendering pipeline, which shares reactive logic across server and client environments to support both initial