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Software Development · head to head

LangSmith vs Devin

L

LangSmith

Software Development

Know what your agents are really doing

From
On request
Rated
-
Full reviewWebsite
Devin logo

Devin

Software Development

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

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; Devin pricing not published; specific costs and plan tiers require signup or contact with sales

Where they differ

Only the attributes on which LangSmith and Devin actually diverge.

Attributes where LangSmith and Devin differ
AttributeLangSmithDevin
PlatformsWebDesktop, Windsurf integration, Web

Identical on both: starting price (On request), pricing model (subscription), free tier (No), user rating (Not yet rated), category (Software Development).

What people use each for

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

LangSmith

No use cases recorded yet. See the LangSmith review.

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

Where each one falls short

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

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.

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

Pricing, plan by plan

LangSmith

On request

No published plan breakdown. See the LangSmith review.

Devin

On request

No published plan breakdown. See the Devin review.

Which should you pick?

Choose LangSmith if

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

LangSmith review

Choose Devin if

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

Questions people ask

Is LangSmith or Devin better?
Neither clearly leads. LangSmith starts at On request and Devin at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, LangSmith or Devin?
LangSmith starts at On request and Devin at On request.
Does LangSmith or Devin run on more platforms?
LangSmith runs on Web. Devin runs on Desktop, Windsurf integration, Web.
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Related pages

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