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SWR

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Modern data fetching library for React with built-in caching, revalidation, and request deduplication.

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Tracked since2026
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The Bottom Line

Entry price

Free, no paid tier

Biggest pro

React data fetching

Biggest con

React only

TL;DR - SWR

  • Modern data fetching library for React using hooks.
  • Features built-in caching, revalidation, and request deduplication.
  • Supports various data sources and integrates with React Suspense, SSR, and SSG.
Pricing: Free forever
Best for: Individuals & startups

What is SWR?

Editorial review
SWR is a lightweight React Hooks library designed for efficient data fetching. It provides a minimal API to handle data requests, caching, revalidation, and request deduplication, ensuring UIs are fast, consistent, and always up-to-date. Developers can fetch data with a single hook, which manages the request lifecycle, caches responses, and keeps data fresh, providing `data`, `error`, and `isLoading` states to drive the UI. SWR covers various aspects of speed, correctness, and stability, including fast page navigation, polling, data dependency management, revalidation on focus/network recovery, local mutation (Optimistic UI), smart error retry, pagination, and scroll position recovery. It is lightweight and agnostic, supporting any data source like REST, GraphQL, or custom fetchers. Built with native React ergonomics, it's compatible with Suspense, SSR, and SSG, and is fully typed, making it suitable for modern React applications.

Available on: Web

how we evaluateSourceswr.vercel.app ↗

Pros & Cons

Pros

  • React data fetching
  • Good caching
  • Vercel backed
  • Active development
  • Simple API

Cons

  • React only
  • TanStack Query alternative
  • Learning curve
  • Limited vs full solutions
  • Feature gaps

Key Features

Data fetchingStale-while-revalidateCache managementRevalidation strategiesSuspense supportReal-time updates

Pricing Plans

Pricing checked Aug 26, 2026

Free

  • Open source (MIT)
  • React Hooks for data fetching
  • 5.3KB minified+gzipped
  • Vercel/Next.js integration
Calculate your costView full pricing

Is SWR worth the price?

100/100

SWR is an open-source library, meaning its 'pricing' is entirely free.

This is exceptionally generous, as it provides powerful data fetching capabilities without any cost. It's best for all developers and teams looking for an efficient and free data fetching solution for React applications.

Hidden Costs & Gotchas

Requires developer time for implementation

No dedicated enterprise support included

Community-driven support only

How SWR Compares to Competitors

Compared to commercial data fetching solutions or even other open-source libraries that might have associated paid services (like some GraphQL clients with hosted backends), SWR stands out by being completely free. Libraries like React Query (TanStack Query) also offer free open-source versions, providing similar value propositions without direct cost.

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Best SWR Alternatives

Top alternatives based on features, pricing, and user needs.

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ReduxFree

A JS library for predictable and maintainable global state management

Zustand logo
ZustandFree

A small, fast, and scalable bear-bones state-management solution for React.

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Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

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SWR FAQ

How does SWR ensure data consistency and freshness in React applications?

SWR achieves data consistency and freshness through built-in caching, automatic revalidation on focus or network recovery, and request deduplication. It also supports polling and data dependency management to keep the UI synchronized with the backend.

Which teams would benefit most from using SWR?

Teams building modern React applications that require efficient data fetching, caching, and real-time UI updates would benefit from SWR. It is particularly useful for projects needing fast page navigation, optimistic UI, and robust error handling.

How does SWR compare to Redux for data management?

SWR focuses specifically on data fetching, caching, and revalidation within React components, providing a minimal API for these tasks. Redux, in contrast, is a more general-purpose state management library that can manage application-wide state beyond just data fetching.

What kind of data sources can SWR integrate with?

SWR is agnostic to the data source and can integrate with any backend, including REST APIs, GraphQL endpoints, or custom fetchers. It provides flexibility for developers to use their preferred data fetching methods.

What are the main limitations to consider when adopting SWR?

A main limitation of SWR is that it is designed exclusively for React applications. While powerful for data fetching, it may have a learning curve and offers a more focused solution compared to full-fledged state management libraries, potentially having feature gaps for broader state needs.

Does SWR include a free tier?

SWR is free to use and does not require any paid plans. It is an open-source library available for all developers.

Can SWR be used with server-side rendering (SSR) or static site generation (SSG)?

Yes, SWR is compatible with both server-side rendering (SSR) and static site generation (SSG). It is built with native React ergonomics, making it suitable for various rendering environments.

Source: swr.vercel.app

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