Softwr

Software Development · head to head

Amp vs Bun

A

Amp

Software Development

Amp is the frontier agent

From
$20/monthly
Rated
-
Full reviewWebsite
Bun logo

Bun

Software Development

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Bun has a free tier, so it costs nothing to try first.
  • Each has a real cost: Amp minimum $20/month subscription cost with limited orb hours (750); Bun linux requires kernel 5.6 or higher (5.1 minimum but with compatibility issues); older systems not supported
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Amp and Bun actually diverge.

Attributes where Amp and Bun differ
AttributeAmpBun
Starting price$20/monthlyFree
Pricing modelsubscriptionopen-source
Free tierNoYes
PlatformsWebmacOS, Windows, Linux, FreeBSD, Android

Identical on both: user rating (Not yet rated), category (Software Development).

What people use each for

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

Amp

  • Building and running parallel AI agents for automationnot Bun
  • Accessing multiple AI models via single subscriptionnot Bun
  • Developing AI applications with flexible compute modelsnot Bun
  • Running high-capacity agent workloads in ultra modenot Bun

Bun

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

Where each one falls short

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

Amp

  • Minimum $20/month subscription cost with limited orb hours (750)
  • High-tier Gigawatt plan at $200/month required for ultra mode agents
  • Usage limits apply after included quotas are consumed each month
  • Each user limited to maximum of 2 simultaneous subscriptions

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

Pricing, plan by plan

Amp

$20/monthly
  • Megawatt$20/monthly
    • All product features
    • 750 hours of orbs
    • Use your ChatGPT subscription
  • Gigawatt$200/monthly
    • Everything in Megawatt plus: 1
    • 000 hours of xxlarge orbs
    • $200 included agent usage
  • Education Discount$10/monthly
    • For students and teachers: full access at $10/month (50% off Megawatt)
  • Unconstrained$undefined/usage
    • Pay for what you use at standard rates
    • all agent modes
    • API pricing for model tokens and orbs

Bun

Free

No published plan breakdown. See the Bun review.

Which should you pick?

Choose Amp if

Nothing in the data separates Amp from Bun on the points above - pick on price and on how each one feels to use.

Amp review

Choose Bun if

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

Questions people ask

Is Amp or Bun better?
Neither clearly leads. Amp starts at $20/monthly and Bun at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Amp or Bun?
Bun has a free tier; the other does not. Paid plans start at $20/monthly for Amp and Free for Bun.
Does Amp or Bun run on more platforms?
Amp runs on Web. Bun runs on macOS, Windows, Linux, FreeBSD, Android.
Can I use Bun for free?
Yes. Bun has a free tier, so you can try it without paying. Amp starts at $20/monthly.
What is Amp best used for?
Amp is most often used for building and running parallel ai agents for automation, accessing multiple ai models via single subscription, developing ai applications with flexible compute models, running high-capacity agent workloads in ultra mode. Of those, building and running parallel ai agents for automation and accessing multiple ai models via single subscription are not what Bun is typically brought in for.

Answered from the vendors’ own pages

Amp: How much does Amp cost per month?

Amp offers two main monthly plans: Megawatt at $20/month (750 hours of orbs) and Gigawatt at $200/month (1,000 hours of xxlarge orbs). Students and teachers get a 50% education discount ($10/month). Source: https://ampcode.com/pricing

Source
Bun: Is Bun free?

Yes, Bun is free and open-source software; no pricing tiers or subscription costs exist for the core runtime and tooling.

Source
Amp: What usage is included in Amp subscriptions?

At minimum, Amp subscriptions include agent usage equal to the subscription cost per month. Depending on usage patterns, you may receive additional usage beyond the base guarantee. Megawatt includes 750 orb hours and Gigawatt includes 1,000 hours of xxlarge orbs.

Source
Bun: How much does Bun cost for production use?

Bun itself has no production licensing costs; you only pay for infrastructure (servers, compute) to run applications built with Bun.

Source
Amp: Can I use my own ChatGPT subscription with Amp?

Yes, Amp subscribers who link a ChatGPT subscription pay no per-token fees and can use as many tokens as their third-party subscription allows, making it ideal for users who already have ChatGPT access.

Source
Bun: Does Bun offer commercial support or service tiers?

Bun's free open-source model does not include published commercial support tiers; enterprise support arrangements would require direct contact with Anthropic.

Source
Bun: Can I use Bun in production without paying?

Yes, Bun is free to use in production since it is open-source software with no licensing fees, though you must cover your own operational costs.

Source
Share

Related pages

More on Amp

More on Bun

Keep looking

Other head to heads