brain2

A local-first second brain PWA. Type or dictate Markdown notes, fully Obsidian-compatible. Offline semantic search powered by a real neural embedding model running entirely in-browser — no API, no data leaving your device.

Live: https://brain2-app.netlify.app

Features

• Offline semantic search — Transformers.js runs a neural embedding model in-browser. No external API needed, no data sent anywhere.
• Obsidian-compatible — Standard Markdown with [[wikilinks]], tags, and frontmatter. Import/export your existing vault.
• Dictation — Voice-to-text note entry.
• Google Docs backup — Optional sync to Google Drive.
• AI auto-tagging — Optional: bring your own Anthropic API key.
• Private by architecture — All data stays in IndexedDB on your device.

Tech Stack

• Next.js + React + TypeScript
• Transformers.js (@huggingface/transformers) — in-browser neural embeddings
• Dexie (IndexedDB)
• @serwist/next (PWA / service worker)
• Anthropic SDK (optional AI tagging)
• ESLint + Prettier + Husky + Vitest + Playwright

Development

npm install
npm run dev        # Start Next.js dev server
npm run build      # Production build
npm run check      # Run all checks (lint, typecheck, test, format)
npm run test:e2e   # Playwright end-to-end tests

Deployment

Deployed on Netlify. Auto-deploys from main branch.