What is the best free alternative to Letta?
Mem0 is the closest free alternative to Letta: same Agent Memory & RAG-as-a-Service sub-category, and it is free tier + paid. Free Hobby tier: unlimited end users, 10K add / 1K retrieval requests/month
Best free Letta alternatives
Looking for a free alternative to Letta? Here are 9 agent memory & rag-as-a-service worth trying — 9 with a free tier. Letta itself is free tier + paid.
| Tool | Letta (you searched) | Mem0 | Zep | Supermemory |
|---|---|---|---|---|
| Pricing | freemium | freemium | freemium | freemium |
| Best for | Free BYOK plan supporting up to 3 stateful agents | Free Hobby tier: unlimited end users, 10K add / 1K retrieval requests/month | Free plan: 10,000 monthly credits, 2 projects, 200ms retrieval | Free monthly usage allowance plus a Supermemory MCP server |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |
Letta alternatives — straight answers
Are there free Letta alternatives?
Yes — 9 of the 9 alternatives listed here are free or freemium: Mem0, Zep, Supermemory, Ragie, Zhipu AutoGLM. None of them are paid-only.
Is Letta free?
Letta is free tier + paid. There is a free tier you can work in, with paid plans above it.
How were these Letta alternatives chosen?
They are the other tools in Agent Memory & RAG-as-a-Service, then the rest of AI Agents & Automation, ordered free tiers first and capped at 9. There is no sponsorship and no paid placement in that ordering — only the pricing tier decides.
All Letta alternatives
Browse Agent Memory & RAG-as-a-Service →Mem0
Agent Memory & RAG-as-a-Service
✦ WhyA Letta alternative — Free Hobby tier: unlimited end users, 10K add / 1K retrieval requests/month.
- Free Hobby tier: unlimited end users, 10K add / 1K retrieval requests/month
- Graph memory and entity linking for agent context
- Open-source core plus managed cloud API
Zep
Agent Memory & RAG-as-a-Service
✦ WhyA Letta alternative — Free plan: 10,000 monthly credits, 2 projects, 200ms retrieval.
- Free plan: 10,000 monthly credits, 2 projects, 200ms retrieval
- Graph RAG with automated context assembly from chat + business data
- Temporal knowledge graph for tracking how facts change over time
Supermemory
Agent Memory & RAG-as-a-Service
✦ WhyA Letta alternative — Free monthly usage allowance plus a Supermemory MCP server.
- Free monthly usage allowance plus a Supermemory MCP server
- Native connectors for Google Drive, Notion, OneDrive as memory sources
- Deduplication so repeated content isn't rebilled
Ragie
Agent Memory & RAG-as-a-Service
✦ WhyA Letta alternative — Free Developer plan for personal projects/exploration.
- Free Developer plan for personal projects/exploration
- Managed hybrid search, entity extraction and reranking out of the box
- Handles audio/video ingestion billed separately by duration
Zhipu AutoGLM
General Autonomous Agents
✦ WhyA Letta alternative — Free foundation-agent system for autonomous GUI control (web + Android).
- Free foundation-agent system for autonomous GUI control (web + Android)
- Voice-to-action: controls entire web/phone UI from a spoken instruction
- AutoGLM Rumination adds deep-research style multi-step task execution
Windmill
Workflow Automation
✦ WhyA Letta alternative — Open-source, self-hostable with unlimited executions on the free tier.
- Open-source, self-hostable with unlimited executions on the free tier
- Turns scripts (Python/TS/Go/Bash/SQL) into flows and full internal apps
- Kubernetes/Docker/Fargate deployable with a hybrid seat+compute enterprise pricing model
Langflow
Workflow Automation
✦ WhyA Letta alternative — Open source with 138k GitHub stars, free desktop app and free cloud account.
- Open source with 138k GitHub stars, free desktop app and free cloud account
- Drag-and-drop visual builder for agents and RAG pipelines on top of LangChain primitives
- Deep integrations across major LLMs, vector DBs and Google Cloud/Slack/MongoDB
LangGraph
Agent Frameworks (Developers)
✦ WhyA Letta alternative — Build stateful, multi-agent apps as graphs.
- Build stateful, multi-agent apps as graphs
- Human-in-the-loop and durable execution
- Works with any LLM
- Open-source with a hosted platform
OpenAI Agents SDK
Agent Frameworks (Developers)
✦ WhyA Letta alternative — Lightweight agent orchestration from OpenAI.
- Lightweight agent orchestration from OpenAI
- Agent handoffs, guardrails and tracing
- Tool and function calling built in
- Open-source, pay only for model usage