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Software Development · head to head

Devin vs LangSmith

Devin logo

Devin

Software Development

Autonomous AI software engineer planning and executing code in its own environment

From
On request
Rated
-
Full reviewWebsite
LangSmith logo

LangSmith

Software Development

Know what your agents are really doing

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only LangSmith has a free tier, so it costs nothing to try first.
  • Each has a real cost: Devin pricing not published; specific costs and plan tiers require signup or contact with sales; LangSmith usage-based pricing applies beyond included traces; LCU charges at $1.50/LCU and LSU at $1.00/LSU
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Devin and LangSmith actually diverge.

Attributes where Devin and LangSmith differ
AttributeDevinLangSmith
Starting priceOn requestFree
Pricing modelsubscriptionfreemium
Free tierNoYes
PlatformsDesktop, Windsurf integration, WebWeb

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.

Devin

  • Feature implementation and ticket resolution in established codebasesnot LangSmith
  • Code migrations and refactoring at scale across repositoriesnot LangSmith
  • Bug fixing and debugging with test-driven verificationnot LangSmith
  • Rapid prototyping and proof-of-concept developmentnot LangSmith
  • Repetitive implementation tasks freeing human engineers for complex designnot LangSmith

LangSmith

  • Tracing agent execution step-by-step in productionnot Devin
  • Detecting agent failures affecting latency and costnot Devin
  • Monitoring token usage and latency percentilesnot Devin
  • Clustering traces to identify failure modesnot Devin
  • Self-hosting traces within VPC for data residencynot Devin

Where each one falls short

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

Devin

  • Pricing not published; specific costs and plan tiers require signup or contact with sales
  • Cannot handle extremely difficult tasks reliably; success rate decreases with task complexity
  • Requires clear, well-scoped task descriptions; ambiguous requirements reduce effectiveness
  • Requires human oversight and integration into existing workflows; not fully autonomous

LangSmith

  • Usage-based pricing applies beyond included traces; LCU charges at $1.50/LCU and LSU at $1.00/LSU
  • Free tier limited to 1 seat and 5,000 traces per month

Pricing, plan by plan

Devin

On request

No published plan breakdown. See the Devin review.

LangSmith

Free
  • DeveloperFree
    • 1 seat maximum
    • 5,000 base traces monthly
  • Plus$39/month
    • Unlimited seats
    • 10,000 base traces monthly
    • 1 free small serverless deployment
  • Enterprise$null/mo
    • Custom pricing
    • Self-hosted and hybrid options
    • Custom SSO, ABAC, RBAC

Which should you pick?

Choose Devin if

  • You work on Desktop, Windsurf integration, Web.
Devin review

Choose LangSmith if

  • You want to start without paying.
LangSmith review

Questions people ask

Is Devin or LangSmith better?
Neither clearly leads. Devin starts at On request and LangSmith at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Devin or LangSmith?
LangSmith has a free tier; the other does not. Paid plans start at On request for Devin and Free for LangSmith.
Does Devin or LangSmith run on more platforms?
Devin runs on Desktop, Windsurf integration, Web. LangSmith runs on Web.
Can I use LangSmith for free?
Yes. LangSmith has a free tier, so you can try it without paying. Devin starts at On request.
What is Devin best used for?
Devin is most often used for feature implementation and ticket resolution in established codebases, code migrations and refactoring at scale across repositories, bug fixing and debugging with test-driven verification, rapid prototyping and proof-of-concept development. Of those, feature implementation and ticket resolution in established codebases and code migrations and refactoring at scale across repositories are not what LangSmith is typically brought in for.

Answered from the vendors’ own pages

Devin: What does Devin cost?

Devin's pricing is not publicly listed on their website. Interested parties must request a demo to discuss pricing and availability.

Source
LangSmith: What does LangSmith cost?

LangSmith Developer plan is free with up to 5,000 base traces monthly. Plus plan costs $39/month per seat with 10,000 base traces included. Enterprise pricing is custom.

Source
Devin: How do I get access to Devin?

Devin is accessed by requesting a demo. There is no information about self-service signup, trial, or pricing on the public website.

Source
LangSmith: How does LangSmith usage-based pricing work?

Beyond included traces, LangSmith charges $1.50 per LCU (LangChain Compute Unit) for computational work and $1.00 per LSU (LangChain Storage Unit) for data storage.

Source
LangSmith: Is there a free tier for LangSmith?

Yes, the Developer plan is free with limits on seat count (1 seat maximum) and trace volume (5,000 base traces per month).

Source
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