Software Development · head to head
Bun vs Clerk
Bun
Software Development
JavaScript runtime, bundler, test runner and package manager unified in single toolchain
- From
- Free
- Rated
- -
Clerk
Identity & Access Management
Drop-in user authentication and management for developers
- From
- Free
- Rated
- -
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; Clerk pricing scales with monthly retained users, which can grow expensive quickly for consumer apps with large user bases.
Where they differ
Only the attributes on which Bun and Clerk actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Bun
Nothing recorded that Clerk does not also cover.
Only in Clerk
- Prebuilt UI components
- Organization management
- Multi-factor authentication
- Social sign-on
- Billing
- Enterprise connections
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 Clerk
- Single-file executable deployment without Node runtime dependenciesnot Clerk
- Monorepo management with workspace supportnot Clerk
- Full-stack development with unified toolchainnot Clerk
- Systems programming and shell scripting with JavaScriptnot Clerk
Clerk
- Adding sign-in and user profiles to a web or mobile app quicklynot Bun
- B2B SaaS apps needing organizations and role-based accessnot Bun
- Startups wanting prebuilt UI instead of building auth in-housenot Bun
- Apps needing MFA and fraud detection out of the boxnot Bun
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
Clerk
- Pricing scales with monthly retained users, which can grow expensive quickly for consumer apps with large user bases.
- Enterprise SSO connections beyond the first are billed as add-ons, adding cost for larger organizations.
- The Business tier's extra dashboard seats cost $20/month each, which adds up for larger teams.
- Enterprise-tier features like the 99.99% uptime SLA require annual contracts rather than flexible monthly billing.
Pricing, plan by plan
Bun
FreeNo published plan breakdown. See the Bun review.
Clerk
Free- HobbyFree
- 50,000 MRU limit per app
- Up to 3 dashboard seats
- Unlimited applications
- Pro$25/month
- 50,000 MRUs included, $0.02/MRU overage
- Up to 3 dashboard seats
- 1 Enterprise Connection included
- Business$300/month
- 50,000 MRUs included with volume pricing
- 10 dashboard seats included
- SOC2 report and priority support
- Enterprise$undefined/month
- Custom pricing, annual billing
- 99.99% uptime SLA
- HIPAA available, dedicated Slack channel
Which should you pick?
Choose Bun if
- You want to start without paying.
- You work on macOS, Windows, Linux, FreeBSD, Android.
Choose Clerk if
- You need prebuilt ui components.
- You want to start without paying.
- You work on web, ios, android, api.
- You also want organization management.
Questions people ask
- Is Bun or Clerk better?
- Neither clearly leads. Bun starts at Free and Clerk at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Bun or Clerk?
- Bun starts at Free and Clerk at Free.
- Does Bun or Clerk run on more platforms?
- Bun runs on macOS, Windows, Linux, FreeBSD, Android. Clerk runs on web, ios, android, api.
- 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 Clerk is typically brought in for.
- What can Bun do that Clerk cannot?
- Clerk covers Prebuilt UI components, Organization management, Multi-factor authentication, Social sign-on.
Answered from the vendors’ own pages
Clerk: What does Clerk cost?
Clerk's Hobby plan is free with a 50,000 MRU limit; Pro is $25/month ($20/month billed annually), Business is $300/month ($250 annually), and Enterprise uses custom annual pricing.
SourceClerk: Is there a free plan and what are its limits?
Yes, the Hobby plan is free with a 50,000 monthly retained user (MRU) limit per app, up to 3 dashboard seats, and unlimited applications, with no credit card required.
SourceClerk: How is usage metered?
Clerk meters by monthly retained users (MRUs) — users who return to the app at least a day after signing up — with overage billed at $0.02 per MRU beyond the included 50,000 on paid plans.
SourceRelated pages
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