Automation & Integration · head to head
Letta vs Flowise
The short version
- Only Flowise has a free tier, so it costs nothing to try first.
- Each has a real cost: 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.; Flowise the free plan caps at 2 flows and 100 predictions per month; the $35 per month Starter plan raises that to 10,000 predictions with additional users billed at $15 per user per month on Pro, as of August 2026.
Where they differ
Only the attributes on which Letta and Flowise actually diverge.
Identical on both: platforms (Web), user rating (Not yet rated), category (Automation & Integration).
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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.
Flowise
- The free plan caps at 2 flows and 100 predictions per month; the $35 per month Starter plan raises that to 10,000 predictions with additional users billed at $15 per user per month on Pro, as of August 2026.
Pricing, plan by plan
Letta
On requestNo published plan breakdown. See the Letta review.
Flowise
FreeNo published plan breakdown. See the Flowise review.
Which should you pick?
Choose Letta if
Nothing in the data separates Letta from Flowise on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is Letta or Flowise better?
- Neither clearly leads. Letta starts at On request and Flowise at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Letta or Flowise?
- Flowise has a free tier; the other does not. Paid plans start at On request for Letta and Free for Flowise.
- Does Letta or Flowise run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- Can I use Flowise for free?
- Yes. Flowise has a free tier, so you can try it without paying. Letta starts at On request.
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