What is the best free alternative to MemOS?
RAGFlow is the closest free alternative to MemOS: same Agent Memory & RAG-as-a-Service sub-category, and it is free. Open-source RAG engine with deep document parsing and agent workflows
Best free MemOS alternatives
Looking for a free alternative to MemOS? Here are 9 agent memory & rag-as-a-service worth trying — 9 with a free tier. MemOS itself is free.
| Tool | MemOS (you searched) | RAGFlow | LightRAG | Cognee |
|---|---|---|---|---|
| Pricing | free | free | free | free |
| Best for | Memory operating system for LLM agents with hybrid retrieval and persistent memory | Open-source RAG engine with deep document parsing and agent workflows | Simple, fast graph-based RAG from HKU Data Science lab (EMNLP 2025) | Open-source memory platform that turns data into a knowledge graph plus vectors for agents |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |
MemOS alternatives — straight answers
Are there free MemOS alternatives?
Yes — 9 of the 9 alternatives listed here are free or freemium: RAGFlow, LightRAG, Cognee, Graphiti, Memvid. None of them are paid-only.
Is MemOS free?
MemOS is free. There is no paid plan attached to it in the catalog.
How were these MemOS 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 MemOS alternatives
Browse Agent Memory & RAG-as-a-Service →✦ WhyA MemOS alternative — Open-source RAG engine with deep document parsing and agent workflows.
- Open-source RAG engine with deep document parsing and agent workflows
- Grounded citations and template-based chunking
- Self-host with Docker; bring your own LLM
✦ WhyA MemOS alternative — Simple, fast graph-based RAG from HKU Data Science lab (EMNLP 2025).
- Simple, fast graph-based RAG from HKU Data Science lab (EMNLP 2025)
- Combines knowledge-graph and vector retrieval
- Works with local or hosted LLMs
✦ WhyA MemOS alternative — Open-source memory platform that turns data into a knowledge graph plus vectors for agents.
- Open-source memory platform that turns data into a knowledge graph plus vectors for agents
- Python API with pluggable graph, vector and relational stores
- Self-host free; cloud option exists
✦ WhyA MemOS alternative — Framework for building real-time temporal knowledge graphs for AI agents.
- Framework for building real-time temporal knowledge graphs for AI agents
- Powers Zep's memory layer; runs standalone
- Open source, works with Neo4j and other graph DBs
✦ WhyA MemOS alternative — Packs agent memory into a single portable file with no server or database.
- Packs agent memory into a single portable file with no server or database
- Offline retrieval with no cloud dependency
- Open source with SDKs
- Aimed at replacing complex RAG pipelines
✦ WhyA MemOS alternative — MCP server that stores AI conversation memory as local Markdown notes.
- MCP server that stores AI conversation memory as local Markdown notes
- Works with Claude Desktop and other MCP clients, and is readable in Obsidian
- Everything stays on your disk
- Open source core is free; optional paid cloud sync
Mem0
Agent Memory & RAG-as-a-Service
✦ WhyA MemOS 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 MemOS 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 MemOS 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