EverOS
Local-first memory operating system with Markdown as the source of truth.
Open source
EverOS is an open-source memory runtime that stores conversations, files, and agent trajectories as readable Markdown, then syncs SQLite and LanceDB indexes for fast retrieval and self-evolving reuse across coding assistants and workflows.
Official resources
Selection advice
Choose EverOS when memory must stay user-owned, inspectable, and portable across multiple AI clients. Choose Mem0 or RetainDB when memory lives primarily inside application code you ship.
Quick comparison
EverOS treats Markdown files as canonical memory you can grep, edit, and version. Mem0 and RetainDB target SDK-first embedding with more managed-service paths.
| EverOS | Mem0 | RetainDB | |
|---|---|---|---|
| Best for | Portable memory across Claude Code, Codex, MCP clients, and local workflows | Embedding user memory in your own agent product | Hybrid retrieval memory inside coding-agent pipelines |
| Storage model | Markdown source of truth + SQLite + LanceDB | SDK-managed memory with optional hosted platform | Local SDK with hybrid vector + BM25 retrieval |
| Tradeoff | Self-hosted runtime setup vs drop-in SaaS memory APIs | Flexible SDK vs less file-native inspectability | Strong coding-agent retrieval vs no Markdown wiki surface |
Best for
- Markdown-native memory
- local-first privacy
- cross-tool agent memory
- self-evolving reflection
Not ideal for
- teams that want a fully managed memory SaaS
- simple key-value session caching
- products that cannot run a local Python runtime
Core concepts
Markdown source of truthuser episodes and agent skillsorthogonal retrievalKnowledge Wikireflection
Minimal implementation shape
Run `everos server start`, add a conversation via `/api/v1/memory/add`, flush extraction, then search by user_id to recall facts from Markdown-backed memory.