Softwr

Software · head to head

Clerk vs LangSmith

Clerk logo

Clerk

Software

Drop-in user authentication and management for developers

From
Free
Rated
-
Full reviewWebsite
L

LangSmith

Software

Know what your agents are really doing

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Clerk has a free tier, so it costs nothing to try first.
  • Each has a real cost: Clerk pricing scales with monthly retained users, which can grow expensive quickly for consumer apps with large user bases.; LangSmith usage beyond the included trace allotment is billed in LangChain Compute Units at $1.50 per LCU and Storage Units at $1.00 per LSU, an unfamiliar metering unit compared to flat per-seat pricing, as of August 2026.

Where they differ

Only the attributes on which Clerk and LangSmith actually diverge.

Attributes where Clerk and LangSmith differ
AttributeClerkLangSmith
Starting priceFreeOn request
Pricing modelfreemiumsubscription
Free tierYesNo
Platformsweb, ios, android, apiWeb

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

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 Clerk

  • Prebuilt UI components
  • Organization management
  • Multi-factor authentication
  • Social sign-on
  • Billing
  • Enterprise connections

Only in LangSmith

Nothing recorded that Clerk does not also cover.

What people use each for

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

Clerk

  • Adding sign-in and user profiles to a web or mobile app quicklynot LangSmith
  • B2B SaaS apps needing organizations and role-based accessnot LangSmith
  • Startups wanting prebuilt UI instead of building auth in-housenot LangSmith
  • Apps needing MFA and fraud detection out of the boxnot LangSmith

LangSmith

No use cases recorded yet. See the LangSmith review.

Where each one falls short

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

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.

LangSmith

  • Usage beyond the included trace allotment is billed in LangChain Compute Units at $1.50 per LCU and Storage Units at $1.00 per LSU, an unfamiliar metering unit compared to flat per-seat pricing, as of August 2026.

Pricing, plan by plan

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

LangSmith

On request

No published plan breakdown. See the LangSmith review.

Which should you pick?

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.
Clerk review

Choose LangSmith if

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

LangSmith review

Questions people ask

Is Clerk or LangSmith better?
Neither clearly leads. Clerk starts at Free and LangSmith at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Clerk or LangSmith?
Clerk has a free tier; the other does not. Paid plans start at Free for Clerk and On request for LangSmith.
Does Clerk or LangSmith run on more platforms?
Clerk runs on web, ios, android, api. LangSmith runs on Web.
Can I use Clerk for free?
Yes. Clerk has a free tier, so you can try it without paying. LangSmith starts at On request.
What is Clerk best used for?
Clerk is most often used for adding sign-in and user profiles to a web or mobile app quickly, b2b saas apps needing organizations and role-based access, startups wanting prebuilt ui instead of building auth in-house, apps needing mfa and fraud detection out of the box. Of those, adding sign-in and user profiles to a web or mobile app quickly and b2b saas apps needing organizations and role-based access are not what LangSmith is typically brought in for.
What can Clerk do that LangSmith 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.

Source
Clerk: 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.

Source
Clerk: 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.

Source
Share

Related pages

More on Clerk

More on LangSmith

Keep looking

Other head to heads