Software · head to head
Dify vs Letta
The short version
- Only Dify has a free tier, so it costs nothing to try first.
- Each has a real cost: Dify the free Sandbox plan includes only 200 message credits total and one team member; the $590 per year Professional plan raises that to 5,000 message credits per month, 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 Dify and Letta actually diverge.
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.
Dify
- The free Sandbox plan includes only 200 message credits total and one team member; the $590 per year Professional plan raises that to 5,000 message credits per month, 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
Dify
FreeNo published plan breakdown. See the Dify review.
Letta
On requestNo published plan breakdown. See the Letta review.
Which should you pick?
Choose Letta if
Nothing in the data separates Letta from Dify on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is Dify or Letta better?
- Neither clearly leads. Dify 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, Dify or Letta?
- Dify has a free tier; the other does not. Paid plans start at Free for Dify and On request for Letta.
- Does Dify or Letta run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- Can I use Dify for free?
- Yes. Dify has a free tier, so you can try it without paying. Letta starts at On request.