Obsidian's core pitch has always been simple: your notes are just plain Markdown files on your own disk, not locked inside someone else's database. That idea has taken on a new use case in 2026 — if your notes are just files on disk, an AI coding agent like Claude Code, Codex or Cursor can read and edit them directly, no export/import dance required. A wave of newer note-taking apps have picked up exactly that thread and built around it from day one. Here are 7 real alternatives, most of them free and open source, each with a slightly different angle on the same idea.
OpenMarkdown — instant-opening, MCP-native
OpenMarkdown is a tiny notes app that opens in under a second and stores everything as plain text files, built specifically so an AI assistant like Claude can read and edit the same file alongside you via MCP. It's entirely free and open source with no paid tier at all. Pick it if you want the lightest possible app with zero setup friction.
OpenKnowledge — a Notion-like editor with real AI read/write
OpenKnowledge markets itself directly against Obsidian and Notion: a WYSIWYG editor on top of plain Markdown, but with native MCP integration so Claude, Codex or Cursor can read and write documents directly — not just through third-party plugins. It's GPL-3.0+, fully open source, with over 3,000 GitHub stars, and includes agentic search via RAG and embeddings rather than plain keyword search. Pick it if you want an editor experience closer to Notion than to Obsidian's raw Markdown view.
Tolaria — offline-first with Git built in
Tolaria is a 100% free (AGPL-3.0), offline-first note app that stores everything as plain Markdown with a full Git client built in, so version history and sync come for free without a separate service. It also ships with local AI agent integration for Claude Code and Gemini. Pick it if you already think in Git and want note history tracked the same way as code.
Hubble — built explicitly for human + agent co-editing
Hubble is a free, open-source (MIT) notes app designed around the assumption that both you and an AI agent might be editing the same notes at the same time, via direct filesystem access. It ships as both a web app and a desktop Electron app, fully self-hostable. Pick it if you want the simplest possible license (MIT) and don't need a native desktop feel.
Write.md — a focused Markdown editor for Mac
Write.md is a free, open-source Markdown editor for macOS with customizable, reusable appearance profiles, optional Vim bindings and built-in spellcheck. It runs entirely locally with no data ever leaving your machine. The trade-off: it's limited to Apple silicon Macs. Pick it if you're Mac-only and want a distraction-free writing surface rather than a full PKM system.
EverRoom — layered memory built for AI agents specifically
EverRoom is a local-first, open-source workspace that combines a wiki-style knowledge base with versioned evidence tracking and a layered memory system ("MemoryCore") designed so AI agents retain useful context across projects, organized into isolated "Context Rooms". A hosted/team edition is planned but not yet priced. Pick it if your main use case is giving an AI agent long-term project memory, not just editing notes yourself.
Kanwas — for teams, not just solo notes
Kanwas is a shared, open-source (Apache 2.0) workspace where a team's decisions, docs and tasks live in one place that both people and multiple AI agents (Claude, GPT, Gemini) can read from and write to. It's self-hostable for free; hosted pricing wasn't published at launch. It launched #1 on Product Hunt with 742 GitHub stars, and is used by teams at Veed, Wix and Grammarly. Pick it if you need this to work for a team, not just yourself — Obsidian's sync is built for individuals, Kanwas isn't.
Comparison at a glance
| Tool | License / price | Standout feature | Best for |
|---|---|---|---|
| OpenMarkdown | Free, open source | <1 second startup | Minimal footprint |
| OpenKnowledge | GPL-3.0+, free | Notion-like WYSIWYG + RAG search | Notion switchers |
| Tolaria | AGPL-3.0, free | Built-in Git version control | Git-minded users |
| Hubble | MIT, free | Web + desktop, MIT license | Self-hosters wanting simplicity |
| Write.md | Free, open source | Customizable writing profiles | Mac-only distraction-free writing |
| EverRoom | Open source | Layered agent memory (MemoryCore) | Long-term AI agent context |
| Kanwas | Apache 2.0, free (self-host) | Multi-user, multi-agent shared workspace | Teams, not solo notes |
Conclusion
None of these dethrone Obsidian's plugin ecosystem or its years of polish — that's still the safer default for most people. But if the reason you're looking is specifically "I want my AI coding agent to read and edit my notes without jumping through an export step," every tool here was built around that exact problem from day one, which Obsidian, as a general-purpose app, wasn't. Start with OpenMarkdown if you want the lightest option, OpenKnowledge if you want something closer to Notion, or Kanwas if this needs to work for a whole team.