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 Mastra
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 Mastra if typeScript teams who will run Node and already have provider keys.
Best for
Letta An agent that remembers you across sessions
Mastra Ship an agent in Node/Next
Free plan
Letta $0
Mastra $0 · you bring model keys
Lowest paid
Letta Pro (personal) $20/mo
Mastra Persistent server (24/7) $100
Coding agent
Letta Persistent memory
Mastra Agents + tools
Runs where
Letta Hosted
Mastra Hosted
Watch out
Letta You bring the model bill on Free
Mastra Framework $0 is not tokens
Last checked
Letta 2026-10-22 · letta.com/pricing
Mastra 2026-10-22 · mastra.ai/pricing
Which one, then?
Pick Mastra if
typeScript teams who will run Node and already have provider keys.
Read the Mastra page