Pick Letta if
engineers who will run the CLI or the web app and already have an API key or a coding plan.
Read the Letta pageLetta vs Mem0
Our take
Pick Letta if engineers who will run the CLI or the web app and already have an API key or a coding plan. Pick Mem0 if agent builders who want a managed memory store and will stay inside the monthly add/retrieve caps.
Best for
Letta An agent that remembers you across sessions
Mem0 Persist user memories across sessions via an API
Free plan
Letta $0
Mem0 No free plan
Lowest paid
Letta Pro (personal) $20/mo
Mem0 Starter $19
Next step up
Letta
Mem0 Vercel install $20
Coding agent
Letta Persistent memory
Mem0 Entity scoping
Runs where
Letta Hosted
Mem0 Hosted
Watch out
Letta You bring the model bill on Free
Mem0 Hobby and Starter are one project
Last checked
Letta 2026-10-22 · letta.com/pricing
Mem0 2026-10-22 · mem0.ai/pricing
Which one, then?
Pick Mem0 if
agent builders who want a managed memory store and will stay inside the monthly add/retrieve caps.
Read the Mem0 page