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Bun

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Fast JavaScript runtime and package manager

Free, no paid tier
Free Developer Tools Terminal Tools Testing & QA
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Reviews on Trustpilot
4,913 reviews tracked

The Bottom Line

Price
Free, no paid tier. Compare plans

Key facts

  • Bun is an all-in-one JavaScript runtime and toolkit designed for speed
  • It provides a bundler, test runner, and package manager that's dramatically faster than Node
  • Free and open-source

Pros

  • Extremely fast runtime
  • Drop-in Node replacement
  • Built-in bundler and test runner
  • Native TypeScript support
  • All-in-one toolchain

Cons

  • Still maturing (some Node APIs missing)
  • Windows support limited
  • Less battle-tested
  • Edge cases may break
  • Smaller community

What is Bun?

Editorial review
Bun is a JavaScript runtime built for speed. Node.js alternative that runs JavaScript and TypeScript faster, with built-in bundling, testing, and package management-one tool instead of npm, webpack, and jest. The performance improvements are measurable, not marginal. Server-side code runs faster. Development workflows complete quicker. Compatibility with Node.js code means migration is often straightforward. Developers frustrated with JavaScript tooling complexity and Node.js performance find Bun provides dramatic improvements in both areas.

Available on: Linux, macOS, Windows

how we evaluate Source bun.sh ↗

Ratings Across the Web

4.1 (4,913 reviews)

Bun holds an aggregate rating of 4.1 out of 5 from 4,913 reviews across Trustpilot, last checked August 5, 2026.

Trustpilot 4,913 reviews
4.1/5

Ratings aggregated from independent review platforms. Learn more

Key Features

  • Fast JavaScript runtime
  • Built-in bundler
  • Package manager
  • Test runner
  • TypeScript support
  • Node.js compatible

Pricing Plans

Pricing checked Oct 1, 2026

Bun plans and prices, checked October 2026
PlanPriceDetails
Free

Free

  • MIT License
  • Open source
  • JavaScript runtime
+2 more
  • All-in-one toolkit
  • npm compatible
View full pricing

Is Bun worth the price?

Great value

Bun's pricing is exceptionally generous as it is entirely free under the MIT License.

This makes it an incredibly attractive option for developers and organizations of all sizes, as there are no direct costs associated with its use. It's best for anyone looking for a high-performance JavaScript runtime and package manager without budget constraints.

Full Bun pricing: every plan, hidden costs and alternatives

Reviews

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4.1/5

Across 4,913 verified user reviews on Trustpilot

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Best Bun Alternatives

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

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Vite Free

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esbuild Free

Extremely fast JavaScript bundler

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Deno Freemium

The next-generation open-source JavaScript runtime for the modern web, built on web standards.

See all developer tools →

Still deciding?

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

Bun vs npm Head-to-head: features, pricing, who wins Bun vs Yarn Head-to-head: features, pricing, who wins Bun vs Vite Head-to-head: features, pricing, who wins

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Bun FAQ

How does Bun improve JavaScript development workflows?

Bun significantly speeds up JavaScript development workflows by offering a faster runtime and integrating tools like a bundler, test runner, and package manager into a single platform. This consolidation means developers can use one tool instead of managing separate ones like npm, webpack, and Jest.

Which teams benefit most from adopting Bun?

Teams that are frustrated with the complexity of JavaScript tooling and seeking performance improvements for their server-side code will find Bun particularly beneficial. It streamlines development by offering an all-in-one toolchain for running JavaScript and TypeScript.

How does Bun compare to Deno?

Bun differentiates itself from Deno by aiming to be a drop-in replacement for Node.js, offering compatibility with existing Node.js code. It integrates bundling, testing, and package management into a single, fast runtime, whereas Deno has its own distinct runtime and tooling philosophy.

What kind of limitations should users be aware of when considering Bun?

Users should be aware that Bun is still maturing, meaning some Node.js APIs might be missing, and its Windows support is currently limited. While it offers significant speed, it is less battle-tested than older runtimes, and edge cases may occasionally arise.

Does Bun include native TypeScript support?

Yes, Bun offers native TypeScript support, allowing developers to run TypeScript code directly without additional configuration or transpilation steps. This is part of its built-in capabilities as an all-in-one JavaScript and TypeScript runtime.

How is Bun priced?

Bun is free to use, and no paid plan is required to access its features. It provides its fast JavaScript runtime and integrated tooling without any associated cost.

Can Bun replace existing Node.js installations?

Yes, Bun is designed as a drop-in replacement for Node.js, offering compatibility with existing Node.js codebases. This allows for straightforward migration while benefiting from its performance improvements and integrated tooling.

Source: bun.sh

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