Reviewed by the Softwares.com Editorial Team · Last updated June 2026 · How we rate
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
What is Letta?
Letta is a ai agents tool from Letta. Letta is an open-source framework, built on the MemGPT research, for creating stateful AI agents with long-term memory and reasoning.
Letta uses open source pricing and offers a free tier you can start on without a credit card. Free.
It's best suited to developers, ai-engineers and runs on Self Hosted, Api, Web.
Standout strengths include built-in persistent agent memory, based on memgpt research, agent development environment ui. Worth weighing: cloud pricing is usage-based, concepts have a learning curve.
Letta pricing
Pros
- Built-in persistent agent memory
- Based on MemGPT research
- Agent Development Environment UI
Cons
- Cloud pricing is usage-based
- Concepts have a learning curve
Letta vs alternatives
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Frequently asked questions
What is Letta?
Letta is an open-source framework, built on the MemGPT research, for creating stateful AI agents with long-term memory and reasoning.
How much does Letta cost?
Letta is open-source-priced. It has a free tier.
Does Letta have a free trial?
Letta offers a free tier rather than a time-limited trial.
What platforms does Letta support?
Letta is available on Self Hosted, Api, Web.