Softwr

Software · head to head

Deno vs LangSmith

D

Deno

Software

A fast, open-source, fully Node-compatible JS runtime with TypeScript baked right in

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 Deno has a free tier, so it costs nothing to try first.
  • Each has a real cost: Deno the runtime itself is MIT licensed per the project's GitHub repository (denoland/deno LICENSE.md) with no cost, but Deno Deploy's free tier caps at 1 million requests and 15 CPU hours per month, per deno.com/deploy/pricing (Aug 2026); 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 Deno and LangSmith actually diverge.

Attributes where Deno and LangSmith differ
AttributeDenoLangSmith
Starting priceFreeOn request
Pricing modelfreemiumsubscription
Free tierYesNo

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

Where each one falls short

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

Deno

  • The runtime itself is MIT licensed per the project's GitHub repository (denoland/deno LICENSE.md) with no cost, but Deno Deploy's free tier caps at 1 million requests and 15 CPU hours per month, per deno.com/deploy/pricing (Aug 2026)
  • Deno Deploy Pro at $20 per month charges $2 per additional million requests and $0.05 per additional CPU hour once the included quota is exceeded, per deno.com/deploy/pricing

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

Deno

Free

No published plan breakdown. See the Deno review.

LangSmith

On request

No published plan breakdown. See the LangSmith review.

Which should you pick?

Choose Deno if

  • You want to start without paying.
Deno review

Choose LangSmith if

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

LangSmith review

Questions people ask

Is Deno or LangSmith better?
Neither clearly leads. Deno 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, Deno or LangSmith?
Deno has a free tier; the other does not. Paid plans start at Free for Deno and On request for LangSmith.
Does Deno or LangSmith run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Deno for free?
Yes. Deno has a free tier, so you can try it without paying. LangSmith starts at On request.
ShareXLinkedInRedditWhatsAppEmail

Related pages

More on Deno

More on LangSmith

Keep looking

Other head to heads