CrewAI vs 
Letta
CrewAI vs Letta compared for 2026 — features, license, ease of use, performance and which one to choose. Orchestrate role-playing agent crews vs Stateful agents with long-term memory.
Updated regularly · curated by OpenSourceAI.tech
CrewAI vs Letta at a glance
| Spec | CrewAI | Letta |
|---|---|---|
| Category | AI agent framework | AI agent framework |
| Type | Multi-agent framework | Agent runtime (memory) |
| License | MIT | Apache-2.0 |
| Runs locally | Cloud-optional | Self-hosted |
| Primary language | Python | Python |
| Ease of use | Intermediate | Advanced |
| Best for | developers building collaborative agent teams | agents that remember across sessions |
| GitHub stars | 56.3k | 24k |
How CrewAI and Letta score
| Criterion | CrewAI | Letta |
|---|---|---|
| Popularity | 4.5 | 3.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 3.5 | 2.5 |
| Privacy | 3.5 | 4.5 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
CrewAI
CrewAI is a framework for orchestrating role-playing autonomous agents that collaborate as a crew to complete complex tasks, independent of LangChain.
- Intuitive role-based agent crews
- Standalone, no LangChain dependency
- Fast-growing community and templates
Letta
Letta (formerly MemGPT) is a framework and server for building stateful agents with long-term memory that persists across sessions, with a visual agent editor.
- Persistent long-term agent memory
- Server with REST API and visual editor
- Model-agnostic and self-hostable
Key differences
CrewAI is multi-agent framework, while Letta is agent runtime (memory). Their licenses differ (MIT vs Apache-2.0), which matters if you ship a commercial product. CrewAI leans more intermediate-friendly, whereas Letta is more suited to advanced users. They also differ in how they run (Cloud-optional vs Self-hosted). In short, CrewAI fits developers building collaborative agent teams, and Letta fits agents that remember across sessions.
Which should you choose?
Choose CrewAI for developers building collaborative agent teams. Choose Letta for agents that remember across sessions.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is CrewAI or Letta easier to use?
CrewAI is generally the easier of the two to get started with, while Letta rewards more setup with more control.
Are CrewAI and Letta free?
CrewAI is free and open source (MIT), and Letta is free and open source (Apache-2.0). Neither charges for the core software.
Can I run CrewAI and Letta locally?
CrewAI: cloud-optional · Letta: self-hosted. Both can be used without sending your data to a third-party cloud where their setup allows.
CrewAI vs Letta — which should I pick in 2026?
Choose CrewAI for developers building collaborative agent teams. Choose Letta for agents that remember across sessions.
People also compare
Explore more open-source AI
Browse thousands of open-source AI tools, models and projects — all curated in one place, updated daily.
Explore the directory →