Open-source alternatives to Nprogress

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

Pace is a browser-based utility that automatically monitors the loading state of web applications to provide visual feedback during page transitions and asynchronous operations. It functions as a frontend performance monitoring tool that tracks document readiness, network requests, and browser event loop activity to visualize progress without requiring manual markup changes. The library distinguishes itself by using automated tracking mechanisms that hook into native browser objects and document lifecycle events. By employing a state-machine-driven controller, it manages the visibility of pro

Ark is a headless UI component library that delivers accessible, cross-framework primitives with behavior governed by finite state machines. It provides unstyled components that encapsulate logic and accessibility — including full keyboard navigation, focus management, and WAI-ARIA support — while leaving visual styling entirely to the consumer. Components expose scoped data attributes for CSS targeting and use state machines to produce predictable, testable interactive behavior across every state transition. The library distinguishes itself through a state propagation model that distributes

This project is a client-side library for rendering responsive, animated SVG progress indicators. It functions as a frontend UI component and vector animation library designed to visualize completion status through linear, circular, and radial shapes. The library is distinguished by its support for custom vector path geometries, allowing users to define specific SVG path data to create specialized shapes. It uses a vector-based rendering approach to ensure that indicators remain sharp across different screen resolutions. The tool covers a range of capabilities including both static and anima

Android-SpinKit is an Android animation library that provides a collection of animated loading spinner views for use as progress indicators during asynchronous operations. The library offers multiple predefined animation styles, including Circle, Wave, and DoubleBounce, which can be selected and displayed as standard Android View elements within an application's layout. The library distinguishes itself by being built entirely on the Android SDK's drawing and animation APIs, with no external dependencies required. Each spinner type implements a distinct animation state machine using Android's

NVActivityIndicatorView is a library of themed and configurable animation views used to replace standard system loading spinners in iOS applications. It provides a collection of reusable Swift UI components designed to signal background processing and data loading through various visual styles. The library focuses on custom activity indicators that allow for the implementation of stylized loading animations with specific colors and patterns. It enables the visualization of asynchronous processes and mobile app loading states to notify users that a background task is active. These components

NJKWebViewProgress is an iOS web view UI component and loading monitor designed to track and visually represent the loading state of web pages within a mobile application. It functions as a progress indicator that monitors browser activity to provide real-time feedback on page load completion. The project integrates with embedded web content to drive numerical loading values and visual indicators, such as loading bars, to manage the user interface during the page load process. The implementation relies on delegate callbacks and key-value observing to monitor the underlying web view state and

This project is a comprehensive UI toolkit that provides a declarative, reactive framework for building modular web interfaces. It centers on a component-based architecture that maps application state to rendered elements, utilizing a twelve-point flexbox grid system and nested containers to manage complex layouts. The library ensures consistent behavior across large-scale applications by providing centralized configuration for component defaults, themes, and global design tokens. What distinguishes this framework is its deep integration of Material Design principles alongside a highly flexib

Coss is an accessible UI component library and design system framework used to build web interfaces. It provides a comprehensive kit of interactive elements and layout building blocks that follow screen reader and keyboard navigation standards. The project functions as a UI overlay management library, offering specialized tools for implementing anchored popovers, tooltips, and slide-out panels with smooth transitions. It includes a set of accessible form primitives and selection controls to ensure compatibility across different assistive technologies. Its broader capabilities cover the const

Taiga UI is an Angular UI component library and accessible design system used for building enterprise web interfaces. It provides a comprehensive collection of reusable interface elements and layout tools, functioning as a mobile-first UI kit with responsive components that adapt to different device capabilities. The library distinguishes itself through an integrated data visualization library featuring various chart types and a dedicated form management framework with built-in validation and formatting for specialized data. It also features AI-driven development workflows by integrating comp

tapkulibrary is a collection of reusable user interface elements and layout utilities for building native iOS applications. It provides a modular set of building blocks, including a custom graphics framework, networking toolkits, and specialized interface components. The library includes a dedicated media gallery component for creating 3D perspective coverflow galleries and swipeable lists, as well as a grid-based calendar interface for monthly event layouts and date selection. The toolkit covers asynchronous network communication, allowing for data request scheduling on background threads.

react-select is a customizable select input for React applications that supports single and multiple value selection with integrated search. It functions as a form input library providing a selection interface capable of fetching and displaying options from remote APIs dynamically as a user types. The library is distinguished by a component-injection architecture that allows users to replace internal UI fragments with custom React components. It further enables deep visual customization through prop-based style merging, allowing user-defined CSS objects to override internal defaults for brand

gpui-component is a native desktop UI kit and component library built for the GPUI framework. It provides a collection of reusable user interface elements, a desktop layout engine for organizing application space, and a specialized data visualization library for rendering quantitative information. The project is distinguished by its high-performance rendering systems, including a virtualized data grid and list system designed to handle large datasets with low memory overhead. It also features a comprehensive data visualization toolkit for rendering charts, axes, and coordinate scales using li

FSCalendar is a customizable calendar UI library and date picker component for iOS applications. It provides a programmable interface for rendering date grids and event markers, supporting both Swift and Objective-C development. The library enables the creation of custom date picking interfaces with specific range restrictions and selection rules. It supports the display of date-based metadata and event visualization within a mobile scheduling context. The framework covers visual styling and cell design, allowing for custom view components, subtitles, and event markers. It includes a flexibl

react-big-calendar is a React calendar component used for rendering schedules and time-based events within web applications. It functions as a customizable event scheduler and JavaScript date visualization library that maps scheduled activities to a time-grid layout. The project is a date-agnostic scheduling interface, utilizing a pluggable adapter to support various third-party JavaScript date libraries. It allows for the replacement of internal calendar elements with custom React components and employs SASS variables for visual styling. The library covers interactive event scheduling and t

Toastr is a JavaScript toast notification library and client-side alert manager used to display non-blocking alert messages and system notifications in web browsers. It serves as a frontend notification UI for rendering timed messages that provide real-time visual feedback within web applications. The library includes a notification system that supports right-to-left layout mirroring for internationalized applications. It also features a mechanism to prevent duplicate notifications by matching new content against active alerts to avoid redundant stacking. The system manages notification life

Dva is a state management library and client-side application framework designed for building user interfaces with React and Redux. It functions as an asynchronous logic orchestrator and a single page application router, organizing application data through a structured data flow of reducers, effects, and subscriptions. The framework distinguishes itself through the use of generator functions to manage asynchronous workflows and sequential side effects, keeping these operations separate from synchronous state updates. It implements namespace-based model organization to group business logic and

Sortable is a JavaScript drag and drop library used to create reorderable lists of HTML elements. It is a framework-agnostic tool and a touch-enabled interaction library that functions across modern browsers and touch devices without dependencies on specific web frameworks. The library enables the movement and cloning of elements between different containers using shared group configurations. It supports the repositioning of multiple items simultaneously and the use of specific drag handles to restrict which areas of an element trigger a move. Additional capabilities include programmatic sor

React Native Paper is a cross-platform UI framework that provides a comprehensive suite of pre-built components based on Material Design specifications. It serves as a library for building consistent mobile interfaces by mapping high-level design elements to native platform primitives, ensuring a unified visual language across different operating systems. The library distinguishes itself through a global context provider that manages theme injection and portal-based overlay rendering for elements like modals and tooltips. Developers can apply custom brand identities by overriding default desi

This project is a JavaScript UI component library and frontend utility toolkit. It serves as a web modal framework and popup library, providing a specialized system for rendering interactive dialogs, overlays, and layered interfaces over web page content. The library is distinguished by its comprehensive set of overlay tools, including alert dialogs, confirmation prompts, and the ability to embed external content via iframes. It also features a responsive twelve-column grid system for cross-device layout compatibility and an internal modular dependency management system for on-demand loading

vue-awesome-swiper is a Vue.js component wrapper for the Swiper library, providing a declarative interface for creating touch-enabled carousels. It serves as a virtualized slider component that can render only visible slides to maintain performance when handling large datasets. The project distinguishes itself through high-performance rendering and a wide array of visual effects, including 3D transitions, parallax movements, and image zoom capabilities. It also supports the synchronization of multiple slider instances and provides accessibility features such as ARIA roles and focus-scrolling

mini.nvim is a comprehensive library of independent modules designed to extend Neovim with a wide array of navigation, user interface, and text manipulation tools. It serves as a modular plugin collection, a UI toolkit for creating custom statuslines and notifications, and a package manager for installing and pinning external plugins from Git. The project provides a specialized fuzzy picker framework for filtering files and symbols, an LSP completion engine with interactive snippet expansion, and a dedicated plugin test framework that uses headless editor instances and remote procedure calls

Swiper is a modular, touch-enabled library designed for building interactive content carousels and sliders for web and mobile applications. It provides a high-performance rendering engine that manages large datasets by dynamically creating and destroying elements based on their proximity to the viewport, ensuring memory efficiency and smooth operation. The library distinguishes itself through a plugin-based architecture that allows developers to include only the specific functionality required for their project, effectively minimizing bundle sizes. It features a hardware-accelerated animation

Buefy is a lightweight user interface component library built for Vue.js. It serves as a programmatic wrapper for the Bulma CSS framework, providing a set of pre-styled layout utilities, form components, and structural wrappers to ensure a consistent visual identity. The library provides a comprehensive suite of form elements, including specialized date and time pickers, autocomplete inputs, and validation wrappers. It also includes layout tools such as navigation bars, off-canvas sidebars, and modal overlays, as well as notification systems for banners, snackbars, and toasts. Additional cap

Vizro is a low-code Python framework for building production-ready data visualization applications. It functions as a UI orchestrator that allows users to define multi-page analytical dashboards through structured configurations in Python, YAML, or JSON, reducing the need for extensive frontend engineering. The project distinguishes itself through generative AI integration, utilizing a model context protocol server to translate natural language descriptions into validated dashboard configurations, charts, and layouts. It also features a decoupled data cataloging system that separates data sou

Pico is a lightweight, classless CSS framework designed to provide consistent, accessible, and responsive visual defaults for web interfaces. By prioritizing semantic HTML tags, it allows developers to build clean, structured pages without the need for complex class names or heavy dependencies. The framework functions as a comprehensive design system that automatically applies styling to standard elements, ensuring that typography, spacing, and layout remain cohesive across different screen sizes. The framework distinguishes itself through a modular, variable-driven architecture that emphasiz