Open-source alternatives to Flutter Chat Ui

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

This project is a messaging SDK for Android applications, providing the core infrastructure for real-time communication using Kotlin and Jetpack Compose. It offers a suite of modular, declarative UI components and a backend-connected API to manage user authentication, persistent socket connections, and data synchronization. The SDK is distinguished by its offline-first architecture, which utilizes local database persistence to cache conversation history and queue user actions for synchronization once network connectivity is restored. Developers can customize the messaging experience through a

This project is an RTMP media streaming SDK and a real-time communication framework designed for pushing and playing audio and video streams. It provides tools for interactive broadcasting, low-latency voice and video calls, and a cross-platform media player compatible with Windows, iOS, and Android. The toolkit enables interactive live broadcasting with support for multi-host interactions and the ability to push streams to distribution servers via CDN. It includes a cloud recording manager for capturing live sessions and saving them as files to cloud storage, along with a system for composit

Apollo Universal Starter Kit is a full-stack application boilerplate and starter template designed to accelerate cross-platform development across web, mobile, and server environments. It provides a modular architecture that organizes code into independent, self-contained feature directories, combined with a GraphQL-driven data layer and a server-side rendering pipeline to optimize performance and search engine optimization. The project incorporates compile-time code generation tooling to automatically scaffold schemas, resolvers, and components, alongside a real-time subscription engine for

WeUI is a mobile web UI library and design system consisting of CSS components and HTML templates. It is specifically designed to replicate the visual identity and interface of the WeChat messaging ecosystem, providing a standardized set of components to build responsive mobile web interfaces. The library functions as a stateless component system, utilizing a pure CSS architecture and HTML templates that rely on external JavaScript for interactivity. It employs a BEM-based class naming convention to manage component nesting and prevent style leakage across complex layouts. The framework incl

ChatUI is a React conversational UI library and framework designed for building messaging interfaces. It provides a set of components for creating conversation flows, including message bubbles, input areas, and structured message hierarchies. The library distinguishes itself through specialized AI agent interface features, such as the visualization of an agent's reasoning process and simulated typing animations that render text character-by-character. It also includes a system of pre-designed conversational card templates for rendering banners, selection lists, and questionnaires within a cha

This project is a cross-platform UI library for React Native designed to build messaging interfaces. It provides a comprehensive set of specialized components, including message bubbles, input toolbars, and layout containers, to facilitate the development of chat applications on iOS and Android. The library distinguishes itself through a highly flexible configuration interface that allows developers to override default elements and styling to meet specific branding requirements. It includes built-in support for complex interaction patterns such as swipe-to-reply gestures, quick-reply buttons,

Chatto is a Swift-based UI framework and component library for building messaging interfaces on iOS. It provides a collection of reusable interface components for rendering text bubbles, photo attachments, and interactive input areas. The framework centers on a paginated chat interface that loads conversation history in both directions. To maintain scrolling performance, it employs background layout calculations for message cells. The library covers the construction of modular messaging screens and the implementation of mobile chat interactions, such as keyboard dismissal and swipe-to-reveal

Gods-pen is a Vue.js visual page builder and no-code landing page platform for creating responsive mobile marketing pages. It functions as a dockerized content management system and an extensible component framework, enabling the design and publishing of pages with integrated form collection and analytics tracking. The platform features a component marketplace manager for uploading, downloading, and monetizing reusable UI elements across different projects. It provides a comprehensive system for custom component development, utilizing a scaffolding system and schema-driven property mapping to

Spritejs is a graphics library and cross-platform 2D graphics engine designed for rendering geometric shapes and sprites across web, desktop, and mobile environments. It functions as a canvas-based sprite framework that manages elements using a document object model for positioning and styling. The project provides a web worker rendering engine that distributes graphic layers to offscreen canvases, preventing main thread blocking. It also includes a server-side graphics generator for producing visual elements and images in non-browser environments. The toolkit covers a broad range of graphic

react-server is a server-side rendering framework for building universal web applications. It serves as a hydration engine and HTML renderer that executes component logic on both the server and the client to synchronize application state. The project focuses on streaming content delivery, allowing page content to be sent to the browser in fragments as they become available. This approach is combined with server-side HTML generation to improve initial load speeds and search engine indexing. The framework also includes capabilities for automated asset bundling and universal component execution

Pts is a TypeScript creative coding library and data visualization framework designed for building generative art and interactive visuals. It functions as a multi-target graphics engine that outputs visual commands to HTML5 Canvas and SVG through a single unified interface. The toolkit serves as a linear algebra visualization tool, providing mathematical primitives for spatial transforms and geometric calculations. This allows for the creation of algorithmic patterns and the simulation of geometric behaviors. The framework covers a broad capability surface including the design of interactive

This project is a technical breakdown and implementation of a user interface framework's internal architecture, focusing specifically on the mechanics of the virtual DOM, reconciliation, and component lifecycles. It serves as a resource for understanding how a core logic layer manages the transition from high-level component descriptions to physical browser elements. The project distinguishes itself by providing detailed visualizations, including flowcharts and block schemes, to map the reconciliation process and code execution paths. It explores how a platform-agnostic core can be adapted fo

Markstream-vue is a specialized rendering library for Vue and Nuxt applications designed to process and display streaming markdown content in real time. It provides a dedicated component for handling incoming text streams, such as those generated by artificial intelligence models, by converting them into structured visual layouts as the data arrives. The library distinguishes itself through a performance-focused rendering engine that utilizes document virtualization to manage long-form content. By rendering only the segments currently visible within the user viewport, it maintains smooth scro

Base UI is a headless component library and unstyled framework providing accessible interface primitives. It decouples behavioral logic and state management from the visual layer, allowing developers to implement complex UI patterns while maintaining total control over the final styling. The library implements WAI-ARIA design patterns to ensure all primitives support standard keyboard navigation and screen reader accessibility. It provides a suite of low-level building blocks that handle the internal mechanics of interface elements without bundling any CSS. The framework covers a broad range

Mesop is a stateful, declarative Python web UI framework and component library designed for building interactive web applications and AI demos. It allows for the construction of data-driven interfaces and chat systems using only Python, removing the need to write separate HTML or CSS. The framework is specifically tailored for AI application development, offering dedicated tools for conversational UI design and the creation of dashboards for large language model applications. It distinguishes itself with a visual UI editor for real-time property adjustments and the ability to embed custom Jav

IBAnimatable is a set of visual design tools for prototyping bespoke interface elements, motion effects, and navigation transitions within a graphical environment. It provides a designer for creating and prototyping animations directly within the Apple Interface Builder environment and a system for building custom interface components through a visual attributes panel. The project distinguishes itself by offering a visual interface transition editor for configuring screen navigation and gesture-driven transitions without manual coding. It includes a prototyping sandbox for testing interaction

VvvebJs is a self-hosted, vanilla JavaScript library for visually assembling web pages by dragging pre-built HTML components onto a canvas. It functions as a visual HTML editor and component-based page builder that requires no build tools or external dependencies, and can be deployed on a server with PHP or Node.js backend for saving and exporting pages. The builder organizes reusable HTML components into named groups for drag-and-drop assembly, and provides visual property editing that modifies HTML attributes, CSS styles, and class names through form controls and property panels. It include

Lime is a multi-platform text editor designed for code and prose that supports simultaneous multi-point insertion for modifying text in several locations at once. It is a Python-scriptable environment that renders across desktop windows, web browsers, and terminal emulators. The editor is designed to be API-compatible with Sublime Text, enabling the execution of its plugins and the import of its configuration files, keybindings, and themes. This compatibility allows users to reuse third-party extensions and maintain a consistent experience when migrating from that environment. The project pr

MessageKit is an iOS chat UI framework that provides a scrollable conversation interface built on UICollectionView, enabling developers to render text, images, videos, locations, emoji, audio, and contact messages within message bubbles. The framework is designed around a pre-built MessagesViewController that can be subclassed to inherit the full chat layout, input bar, and message display without writing UI from scratch, and it uses a data source protocol for message retrieval along with delegate callbacks for user interactions. The framework distinguishes itself through a highly customizabl

React Email Editor is a drag-and-drop visual builder for creating responsive email templates, built as a React embeddable component. It also serves as an AI-powered email designer, a collaborative email design tool, and a React component library for composing emails programmatically with JSX. The editor represents designs as structured JSON and supports multi-format rendering for email clients, web pages, and PDF. What distinguishes this editor is its deep AI integration: users can generate full email templates from natural language, rewrite text with chosen intent, produce multiple text vari

Webstudio is a visual CMS and website builder that provides a visual development environment for designing and publishing websites. It functions as an AI-powered design tool, a REST and GraphQL API client, and an atomic CSS compiler. The platform distinguishes itself through generative AI capabilities for creating layout variants and refining visual styles from text prompts. It integrates a headless CMS workflow that maps external data sources to visual components and utilizes a specialized compiler to convert design tokens into deduplicated atomic CSS for optimized page load speeds. The sys

Workflow is a cross-platform architectural framework for building deterministic unidirectional state machines and user interfaces in native mobile applications. Available as libraries for both Kotlin and Swift, the framework manages application state and screen navigation using composable state machines that direct data in a single direction from source to interface while routing user actions back to business logic. The architecture models screen navigation as nested presenter states and recursive component hierarchies rather than separate routing logic. Complex application features are buil

This is a mobile object database and NoSQL local data store that replaces relational tables with a schema-based model. It functions as a reactive data store, using live object observations and change notifications to trigger automatic user interface refreshes. The system provides built-in mobile cloud data synchronization to keep local datasets consistent with a remote server across multiple devices. It also includes security features for encrypted local storage, protecting sensitive on-disk data using at-rest encryption keys and fine-grained access control. Broad capabilities include object

Mempalace is a local-first long-term memory store for large language models and AI agents. It provides a persistent storage system for verbatim conversation history and agent data, utilizing a local-first knowledge graph to track evolving entity relationships and timelines. The project implements a standardized memory protocol that allows external AI clients to read and write persistent memory via standard input and output. It features a hybrid semantic search engine that combines keyword boosting and reranking to find precise historical information across scoped categories. The system inclu

Open Design is an AI design orchestration platform and LLM agent workspace designed for generating prototypes, presentations, and motion graphics. It functions as a local-first environment that integrates various command-line AI agents and coding tools into a unified design workflow, allowing users to migrate design specifications into brand-compliant source code. The project is distinguished by its ability to enforce visual consistency through a design system manager that defines brand contracts and tokens using Markdown. It features a specialized motion graphics generator that converts HTML

Element Web is a web-based communication client used for real-time messaging and collaboration via the decentralized Matrix protocol. It functions as an end-to-end encrypted messenger, a VoIP client for voice and video conferencing, and an interface for interacting with integrated bots and external bridges. The project distinguishes itself through a modular architecture that supports runtime module loading and external script imports to extend core capabilities. It provides extensive white-labeling options, allowing for the customization of application branding, visual themes, and the use of