Free where it should be.
Paid where it earns it.
The engine is open source and runs on your hardware, forever. The cloud hosts your vaults and keeps the receipts — start free, upgrade when your agents do.
The full engine, on your hardware. Apache 2.0 — no strings.
- Unlimited local vaults & notes
- All 10 MCP tools — write, search, links…
- Git history, per-agent ACL, provenance
- Hybrid search (keyword + embeddings)
- Content-free local audit log
- Python & TypeScript clients
Hosted vault + live audit trail. Enough to run a real agent.
- 1 hosted vault (
kb0://) - 500 notes
- 50k audit events / month
- 14-day event retention
- 2 API keys
- Dashboard: Vault, Events, Keys
- Sign in with GitHub
Everything in Free, sized for production workloads.
- Unlimited notes & vaults (fair use)
- 1M audit events / month
- 90-day event retention
- Unlimited API keys
- Semantic search on hosted vaults — priority access
- GitHub vault sync — priority access
Need SSO, on-prem, or custom retention? Talk to us →
Fair questions
Is the open-source version really unlimited?
Yes. The engine is Apache 2.0 and fully self-contained — vaults, search, ACL, git history, audit log. It runs on your machine and never needs an account. The cloud is a backend you can point it at, not a paywall in front of it.
What counts as an audit event?
One operation by an agent: a vault.read, vault.search, vault.write, and so on. Events are content-free — paths, queries, and result counts, never your notes' bodies.
Can I export my hosted vault?
Always. Every hosted vault is its own git repository of markdown files. Your data never stops being yours — on any plan, including Free.
What happens if I hit a Free limit?
Nothing breaks silently: writes beyond the limit are politely refused with a clear error, your existing notes and trail stay intact, and upgrading lifts the limit immediately.