Letta vs 
Composio
Letta vs Composio compared for 2026 — features, license, ease of use, performance and which one to choose. Stateful agents with long-term memory vs 250+ ready-made tools for your agents.
Updated regularly · curated by OpenSourceAI.tech
Letta vs Composio at a glance
| Spec | Letta | Composio |
|---|---|---|
| Category | AI agent framework | AI agent framework |
| Type | Agent runtime (memory) | Tool integration layer |
| License | Apache-2.0 | Elastic-2.0 |
| Runs locally | Self-hosted | Cloud-optional |
| Primary language | Python | Python |
| Ease of use | Advanced | Beginner |
| Best for | agents that remember across sessions | agents that must act on real SaaS accounts |
| GitHub stars | 23.8k | 29.2k |
How Letta and Composio score
| Criterion | Letta | Composio |
|---|---|---|
| Popularity | 3.5 | 3.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 2.5 | 5.0 |
| Privacy | 4.5 | 3.5 |
| License freedom | 5.0 | 3.5 |
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
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
Composio
Composio gives agents production-ready integrations (GitHub, Slack, Gmail, Notion and 250+ more) with managed auth, so agents can act on real accounts safely.
- 250+ integrations with managed auth
- Works with every major agent framework
- Handles OAuth pain for you
Key differences
Letta is agent runtime (memory), while Composio is tool integration layer. Their licenses differ (Apache-2.0 vs Elastic-2.0), which matters if you ship a commercial product. Letta leans more advanced-friendly, whereas Composio is more suited to beginner users. They also differ in how they run (Self-hosted vs Cloud-optional). In short, Letta fits agents that remember across sessions, and Composio fits agents that must act on real SaaS accounts.
Which should you choose?
Choose Letta for agents that remember across sessions. Choose Composio for agents that must act on real SaaS accounts.
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 Letta or Composio easier to use?
Composio is generally the easier of the two to get started with, while Letta rewards more setup with more control.
Are Letta and Composio free?
Letta is free and open source (Apache-2.0), and Composio is free and open source (Elastic-2.0). Neither charges for the core software.
Can I run Letta and Composio locally?
Letta: self-hosted · Composio: cloud-optional. Both can be used without sending your data to a third-party cloud where their setup allows.
Letta vs Composio — which should I pick in 2026?
Choose Letta for agents that remember across sessions. Choose Composio for agents that must act on real SaaS accounts.
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