Letta
agent-frameworks
Stateful AI agents with long-term memory (formerly MemGPT).
Pricing
Free plan
Rating
—
Votes
0
Head-to-head comparison
Letta vs LangGraph
Compare Letta and LangGraph side by side across pricing, features, ratings, pros, cons, best-fit use cases, and alternatives.
LangGraph
agent-frameworks
Graph-based orchestration for stateful, controllable LLM agents.
Pricing
Free plan
Rating
—
Votes
0
Feature comparison
Feature
Letta
LangGraph
Category
agent-frameworks
agent-frameworks
Pricing
Free plan
Free plan
Free plan
API access
Mobile app
Browser extension
Team collaboration
Custom training
Self-hosted option
Offline mode
Multi-language support
Letta pros and cons
Purpose-built for the agent memory problem
Strong research pedigree (MemGPT paper)
OS-style tiered memory persists across sessions
Open-source core, free to self-host
Narrower than general agent frameworks
Often used alongside other tooling, not a full stack
Renamed from MemGPT, some older docs use old name
LangGraph pros and cons
Explicit, debuggable control over agent state and flow
MIT-licensed core, free to self-host
Model-agnostic, not tied to one LLM vendor
Strong support for cycles, checkpointing, and human-in-the-loop
Steeper learning curve than high-level agent builders
Requires comfort with graph and state concepts
Paid platform and observability are separate products
Which one should you choose?
Best overall signal
LangGraph
Selected using Toolglade popularity signals such as views and votes.
Best value signal
Letta
Selected using free-plan availability and engagement signals.
Best for
Letta
- developers
- Teams that need persistent agent memory
- Builders of long-running assistants
- Researchers exploring stateful agents
LangGraph
- stateful multi-agent systems
- human-in-the-loop workflows
- production agent control
- long-running agent tasks
- Engineering teams building production agents
FAQ
Is Letta better than LangGraph?
It depends on your use case. Compare category fit, pricing, feature availability, and ratings before choosing.
Which tool has a free plan?
Letta and LangGraph offer a free plan based on current Toolglade data.