kitio.aiLangGraph vs Letta
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Letta has the lower starting price: about $20 a month, against $39 for LangGraph.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Graph-based agent design
- Persistent state
- Human-in-the-loop
- Streaming
- Python and JavaScript
- Persistent agent memory
- Agent SDK and API
- Agent Development Environment
- Cloud or self-hosted
- Agent export and import
| Feature | LangGraph | Letta |
|---|---|---|
| Best for | Low-level framework for building stateful, controllable agents | Platform for stateful AI agents with long-term memory |
| Category | Agents & automation | Agents & automation |
| Pricing model | Freemium | Freemium |
| Starting price | $39/mo | $20/mo |
| Free plan | Yes | Yes |
| Made by | LangChain | Letta |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Letta has the lower starting price: about $20 a month, against $39 for LangGraph.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Developer
Free
- 1 seat
- 5k base traces / month, then pay as you go
- Community support
Plus
$39/mo
- Per seat
- 10k base traces / month, then pay as you go
- Access to Deployment and Engine
- Unlimited seats
Enterprise
Custom
- Self-hosted and hybrid deployment
- Custom SSO, ABAC and RBAC
- Support SLA
5 plans
Free
Free
- Limited stateful agents
- 5 MiB storage per memory repo
- Bring your own API keys
Pro
$20/mo
- Up to 20 stateful agents
- Letta Auto weekly + monthly quota
- 50 MiB storage per memory repo
Teams Pro
$20/mo
- Per seat
- Share agents with access control
- All Pro features
API Plan
$0.10 / active agent / mo
- Unlimited agents
- $0.00015 per sec tool execution
- Pay-as-you-go LLM usage
Enterprise
Contact sales
- Role-based access control
- SAML/OIDC SSO
- Dedicated support
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
LangGraph
- Fine control over agent behavior
- Strong persistence model
- Widely used in production
- Steeper learning curve
- More code than no-code builders
Letta
- Strong long-term memory design
- Open-source core
- Clear view of agent state
- Developer-focused
- Free plan limited to a few agents
Which one should you choose?
Choose LangGraph if you want:
- Fine control over agent behavior
- Strong persistence model
- Widely used in production
Watch out: steeper learning curve.
Choose Letta if you want:
- Strong long-term memory design
- Open-source core
- Clear view of agent state
Watch out: developer-focused.
LangGraph vs Letta FAQ
What is the difference between LangGraph and Letta?
LangGraph: Low-level framework for building stateful, controllable agents. Letta: Platform for stateful AI agents with long-term memory. Both are agents & automation tools.
Is LangGraph or Letta cheaper?
Letta has the lower starting price: about $20 a month, against $39 for LangGraph.
Do LangGraph and Letta have free plans?
LangGraph: Yes. Letta: Yes.
Who makes LangGraph?
LangGraph is made by LangChain, based in United States.
Who makes Letta?
Letta is made by Letta, based in United States.
Which should I choose, LangGraph or Letta?
Choose LangGraph if you value fine control over agent behavior and strong persistence model. Choose Letta if you value strong long-term memory design and open-source core.