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Software · head to head

CrewAI vs Letta

C

CrewAI

Software

The Enterprise Agent Build and Runtime for the work your business runs on

From
Free
Rated
-
Full reviewWebsite
L

Letta

Software

Machines that learn

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only CrewAI has a free tier, so it costs nothing to try first.
  • Each has a real cost: CrewAI the free Basic tier caps at 50 workflow executions per month, with all higher usage requiring a custom Enterprise contract, as of August 2026.; Letta the Developer API plan charges $0.10 per active agent per month plus $0.00015 per second of tool execution on top of a $20 per month base and pay-as-you-go LLM usage, as of August 2026.

Where they differ

Only the attributes on which CrewAI and Letta actually diverge.

Attributes where CrewAI and Letta differ
AttributeCrewAILetta
Starting priceFreeOn request
Pricing modelfreemiumusage-based
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.

CrewAI

  • The free Basic tier caps at 50 workflow executions per month, with all higher usage requiring a custom Enterprise contract, as of August 2026.

Letta

  • The Developer API plan charges $0.10 per active agent per month plus $0.00015 per second of tool execution on top of a $20 per month base and pay-as-you-go LLM usage, as of August 2026.

Pricing, plan by plan

CrewAI

Free

No published plan breakdown. See the CrewAI review.

Letta

On request

No published plan breakdown. See the Letta review.

Which should you pick?

Choose CrewAI if

  • You want to start without paying.
CrewAI review

Choose Letta if

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

Letta review

Questions people ask

Is CrewAI or Letta better?
Neither clearly leads. CrewAI starts at Free and Letta at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, CrewAI or Letta?
CrewAI has a free tier; the other does not. Paid plans start at Free for CrewAI and On request for Letta.
Does CrewAI or Letta run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use CrewAI for free?
Yes. CrewAI has a free tier, so you can try it without paying. Letta starts at On request.
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