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Bun vs pnpm

Bun logo

Bun

Software

JavaScript runtime, bundler, test runner and package manager unified in single toolchain

From
Free
Rated
-
Full reviewWebsite
pnpm logo

pnpm

Software

Fast, disk space efficient package manager

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Bun linux requires kernel 5.6 or higher (5.1 minimum but with compatibility issues); older systems not supported; pnpm smaller ecosystem and community compared to npm

Where they differ

Only the attributes on which Bun and pnpm actually diverge.

Attributes where Bun and pnpm differ
AttributeBunpnpm
Pricing modelopen-sourceUnknown
PlatformsmacOS, Windows, Linux, FreeBSD, AndroidLinux, Windows, macOS
FoundedUnknown2017

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown).

What people use each for

The jobs each tool is most often brought in to do.

Bun

  • High-performance JavaScript services prioritising startup time and memory efficiencynot pnpm
  • Single-file executable deployment without Node runtime dependenciesnot pnpm
  • Monorepo management with workspace supportnot pnpm
  • Full-stack development with unified toolchainnot pnpm
  • Systems programming and shell scripting with JavaScriptnot pnpm

pnpm

No use cases recorded yet. See the pnpm review.

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Bun

  • Linux requires kernel 5.6 or higher (5.1 minimum but with compatibility issues); older systems not supported
  • Native Node.js addons not supported directly; requires FFI workarounds for C libraries
  • Ecosystem less mature than Node.js; fewer third-party packages optimised for Bun
  • Windows support newer and less mature than Linux/macOS; occasional edge cases

pnpm

  • Smaller ecosystem and community compared to npm
  • Symlink-based approach can cause issues in some Windows environments

Pricing, plan by plan

Bun

Free

No published plan breakdown. See the Bun review.

pnpm

Free

No published plan breakdown. See the pnpm review.

Which should you pick?

Choose Bun if

  • You want to start without paying.
  • You work on macOS, Windows, Linux, FreeBSD, Android.
Bun review

Choose pnpm if

  • You want to start without paying.
  • You work on Linux, Windows, macOS.
pnpm review

Questions people ask

Is Bun or pnpm better?
Neither clearly leads. Bun starts at Free and pnpm at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bun or pnpm?
Bun starts at Free and pnpm at Free.
Does Bun or pnpm run on more platforms?
Bun runs on macOS, Windows, Linux, FreeBSD, Android. pnpm runs on Linux, Windows, macOS.
Can I use Bun for free?
Both have a free tier, so you can try either at no cost before committing.
What is Bun best used for?
Bun is most often used for high-performance javascript services prioritising startup time and memory efficiency, single-file executable deployment without node runtime dependencies, monorepo management with workspace support, full-stack development with unified toolchain. Of those, high-performance javascript services prioritising startup time and memory efficiency and single-file executable deployment without node runtime dependencies are not what pnpm is typically brought in for.

Answered from the vendors’ own pages

pnpm: Is pnpm free and open source?

Yes. pnpm is free and open source software developed for Node.js. Version 10 and 11 are currently available.

Source
pnpm: How does pnpm save disk space?

pnpm uses a content-addressable store with hard linking and symlinks to avoid duplication. All files are saved in a single place on disk and hard-linked to individual projects, dramatically reducing storage requirements compared to npm.

Source
pnpm: Is pnpm faster than npm?

Yes. pnpm performs installation in three stages: dependency resolution, directory structure calculation, and linking. Packages are fetched and linked as soon as possible, making it significantly faster than npm's sequential approach.

Source
pnpm: Does pnpm support monorepos?

Yes. pnpm has built-in support for monorepositories. You can create a workspace using pnpm-workspace.yaml to unite multiple projects in a single repository.

Source
pnpm: How does pnpm handle node_modules differently than npm?

pnpm uses symlinks to add only direct dependencies to node_modules root, preventing accidental access to undeclared dependencies. This encourages more explicit dependency management compared to npm's flattened node_modules structure.

Source
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