daybrain

DayBrain

Private local memory for your AI. Your AI knows everything about the internet. It knows nothing about you. DayBrain closes that gap — locally.

How it works

DayBrain runs on your machine and quietly remembers what you work on. Any AI tool (Claude, Cursor, ChatGPT) can ask it for context.

npx daybrain

That's it. One command.

Features

• 11 MCP tools — Claude/Cursor can query your activity, commitments, and context automatically
• Chrome extension — records browsing, detects commitments, one-click copy to paste anywhere
• Local SQLite — all data stays on your machine, no cloud, no accounts
• Commitment detection — catches "I'll send the demo by Friday" from your window titles
• Context switching analysis — how often you jump between apps
• Baseline comparison — "you usually spend 3h in Cursor, today only 1h"
• Linear + GitHub integration — create tasks from detected commitments
• Cross-device sync — your laptop and desktop share the same memory

Quick start

npx daybrain                 # start the server
daybrain onboard             # guided setup (optional)

Connect Claude

{
  "mcpServers": {
    "daybrain": {
      "command": "npx",
      "args": ["-y", "daybrain"]
    }
  }
}

Then ask Claude: "What did I work on today?"

Chrome extension

• Open chrome://extensions
• Enable Developer mode
• Load unpacked → select the extension/ folder
• Click the 🧠 icon in your toolbar → toggle ON → browse normally

Requirements

• Node.js >= 18
• macOS (native watcher) or ActivityWatch (all platforms)

What it detects

Pattern	Example	Confidence
Commitments	"I will send the demo by Friday"	80-90%
Deadlines	"by EOD", "by tomorrow"	75%
Avoidance	Frequent brief visits to Twitter	70%
Context switches	87 switches in one hour	75%

License

MIT