Softwr

Software Development · head to head

LangSmith vs Braintrust

L

LangSmith

Software Development

Know what your agents are really doing

From
On request
Rated
-
Full reviewWebsite
B

Braintrust

Software Development

The active observability platform for agents

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.; Braintrust the free Starter tier includes only $10 of monthly model credits, 1 GB of processed data, and 10,000 scores before overage charges of $4 per GB and $2.50 per 1,000 scores apply, as of August 2026.

Where they differ

Only the attributes on which LangSmith and Braintrust actually diverge.

Attributes where LangSmith and Braintrust differ
AttributeLangSmithBraintrust
Pricing modelsubscriptionusage-based

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

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.

Braintrust

  • The free Starter tier includes only $10 of monthly model credits, 1 GB of processed data, and 10,000 scores before overage charges of $4 per GB and $2.50 per 1,000 scores apply, as of August 2026.

Pricing, plan by plan

LangSmith

On request

No published plan breakdown. See the LangSmith review.

Braintrust

On request

No published plan breakdown. See the Braintrust review.

Which should you pick?

Choose LangSmith if

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

LangSmith review

Choose Braintrust if

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

Braintrust review

Questions people ask

Is LangSmith or Braintrust better?
Neither clearly leads. LangSmith starts at On request and Braintrust at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, LangSmith or Braintrust?
LangSmith starts at On request and Braintrust at On request.
Does LangSmith or Braintrust run on more platforms?
Both run on Web, so platform support will not decide this one for you.
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