LoopX vs 
Letta
LoopX vs Letta compared for 2026 — features, license, ease of use, performance and which one to choose. Keep long-running agent loops on durable, reviewable state vs Stateful agents with long-term memory.
Updated regularly · curated by olud.ai
LoopX vs Letta at a glance
| Spec | LoopX | Letta |
|---|---|---|
| Category | AI agent framework | AI agent framework |
| Type | Agent control plane | Agent runtime (memory) |
| License | MIT | Apache-2.0 |
| Runs locally | Yes | Self-hosted |
| Primary language | Python | Python |
| Ease of use | Intermediate | Advanced |
| Best for | teams running long-lived coding agents that need restartable, auditable loops | agents that remember across sessions |
| GitHub stars | 4.6k | 24.2k |
How LoopX and Letta score
| Criterion | LoopX | Letta |
|---|---|---|
| Popularity | 2.5 | 3.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 3.5 | 2.5 |
| Privacy | 5.0 | 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
LoopX
LoopX is a lightweight, local-first state kernel for long-running AI agent work: durable goals, executable todos, evidence logs, quota-aware auto-wake and verifiable handoffs, agnostic of the agent runtime — Codex, Claude Code, Cursor or your own.
- Durable control state: goals, gates, todos, evidence and handoffs survive across sessions
- Agent-agnostic: works alongside Codex, Claude Code, Cursor or a custom runtime
- Local-first and MIT-licensed, with quota-aware auto-wake against runaway spending
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
LoopX is agent control plane, while Letta is agent runtime (memory). Their licenses differ (MIT vs Apache-2.0), which matters if you ship a commercial product. LoopX leans more intermediate-friendly, whereas Letta is more suited to advanced users. They also differ in how they run (Yes vs Self-hosted). In short, LoopX fits teams running long-lived coding agents that need restartable, auditable loops, and Letta fits agents that remember across sessions.
Which should you choose?
Choose LoopX for teams running long-lived coding agents that need restartable, auditable loops. 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 LoopX or Letta easier to use?
LoopX is generally the easier of the two to get started with, while Letta rewards more setup with more control.
Are LoopX and Letta free?
LoopX 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 LoopX and Letta locally?
LoopX: yes · Letta: self-hosted. Both can be used without sending your data to a third-party cloud where their setup allows.
LoopX vs Letta — which should I pick in 2026?
Choose LoopX for teams running long-lived coding agents that need restartable, auditable loops. Choose Letta for agents that remember across sessions.
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