An extremely fast, React-like JavaScript library for building modern user interfaces on both client and server.
Inferno is an extremely fast, React-like JavaScript library for building high-performance user interfaces on both the client and server. It focuses on delivering the fastest possible runtime performance through optimizations like custom JSX compilers and efficient diffing algorithms, making it ideal for rendering real-time data or large DOM trees.
Frontend developers building performance-critical web applications who are familiar with React's API but need faster rendering speeds, especially for real-time data views or complex UIs.
Developers choose Inferno for its exceptional speed—often outperforming React and Preact—while maintaining a compatible API, lifecycle events on functional components, and controlled component support that other React-like libraries lack.
:fire: An extremely fast, React-like JavaScript library for building modern user interfaces
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Inferno uses custom JSX compilers, bitwise flags for diffing, and child normalization only when needed, consistently topping benchmarks like UI Bench and dbmonster for rendering speed.
With similar lifecycle events, JSX syntax, and one-way data flow, React developers can migrate with minimal code changes, as highlighted in the README's emphasis on easing migration.
Unlike React and Preact, Inferno provides lifecycle events on functional components, enabling lightweight patterns without class syntax, a unique advantage noted in the features list.
Fully supports controlled components for input/select/textarea elements, ensuring the virtual DOM is the source of truth, which the README contrasts as a weakness in Preact.
Inferno only delegates certain events and doesn't rename them (e.g., uses onInput instead of onChange), leading to confusion and incompatibility with React's event patterns, as admitted in the differences section.
With a smaller community than React, finding third-party libraries or tools often requires using inferno-compat or custom solutions, limiting out-of-the-box options.
To achieve peak performance, developers must correctly use JSX flags and child flags, adding cognitive overhead and risk of runtime crashes if misapplied, as warned in the optimization examples.
Inferno is an open-source alternative to the following products:
Preact is a fast 3kB alternative to React with the same modern API, providing a lightweight virtual DOM library for building user interfaces in JavaScript.
React is a JavaScript library for building user interfaces, particularly single-page applications where UI updates are efficient through its virtual DOM implementation.