Letta vs Mastra
Letta and Mastra, side by side — the researched facts from the index.
| Feature | LettaVisit Letta ↗ | MastraVisit Mastra ↗ |
|---|---|---|
| Description | A stateful-agent framework — open-source, memory-first agents whose context, tools and identity persist as a durable server object instead of resetting between sessions. | The TypeScript-native agent framework — agents, durable workflows, memory and observability in one Apache-2.0 package, with an optional managed cloud platform. |
| Category | Agent frameworks | Agent frameworks |
| Pricing | $0 / month | Free |
| Tier | Listed | Listed |
| API | Yes | Yes |
| Tags |
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