LangGraph vs Letta
Updated June 2026 · A structured head-to-head comparison.
The verdict
Both LangGraph and Letta are credible ai agents tools, and the right pick comes down to your priorities.
LangGraph — Build stateful, controllable agent workflows.
Letta — Framework for stateful AI agents with memory.
LangGraph vs Letta: side by side
| Dimension | LangGraph | Letta |
|---|---|---|
| Starting price | Free | Free |
| Free plan | Yes | Yes |
| Pricing model | Open source | Open source |
| Best for | Developers, Ai Engineers, Enterprise | Developers, Ai Engineers |
| Platforms | Self Hosted, Api, Web | Self Hosted, Api, Web |
| Rating | 4.5/5 | 4.4/5 |
LangGraph key facts
- Vendor
- LangChain
- Pricing
- Open source — Free
- Free tier
- Yes
- Platforms
- Self Hosted, Api, Web
- Best for
- Developers, Ai Engineers, Enterprise
- Editor rating
- 4.5 / 5
- Founded
- 2024
- Headquarters
- San Francisco, CA, USA
Letta key facts
- Vendor
- Letta
- Pricing
- Open source — Free
- Free tier
- Yes
- Platforms
- Self Hosted, Api, Web
- Best for
- Developers, Ai Engineers
- Editor rating
- 4.4 / 5
- Founded
- 2023
- Headquarters
- San Francisco, CA, USA
Frequently asked questions
Is LangGraph better than Letta?
Neither is universally better — LangGraph edges ahead on overall rating, but the best choice depends on price, platforms, and your use case. See the side-by-side table above.
Is LangGraph or Letta cheaper?
LangGraph is the more affordable of the two to get started, at free. LangGraph starts at free; Letta starts at free.
Can LangGraph replace Letta?
Yes for most teams — both are ai agents tools with heavily overlapping features. The main trade-offs are pricing and platform support, covered in the comparison above.