Second Brain

Persistent memory for AI agents.

Human-readable. API-first. $19/mo.

Get Started Free API Docs

API-First Knowledge Graph

REST API + MCP server. Your AI agents can read, write, search, and link knowledge notes.

Cross-Agent Memory

Claude, GPT, custom agents — all writing to the same brain. Knowledge compounds across every interaction.

Human Dashboard

See what your agents wrote. Browse, search, and stay in control of your knowledge.

Pricing

Hacker 1K API calls/mo, 100 notes
Free
Builder 50K calls/mo, unlimited notes, MCP + semantic search
$19/mo
Scale 500K calls/mo, 20 API keys, priority support
$49/mo