David

David is an AI assistant you can text over iMessage. Send a message to a phone number and get intelligent, conversational responses powered by Claude.

How it works

1. Sendblue (iMessage API provider) receives your iMessage and sends a webhook to Convex
2. Convex webhook handler stores the message, fires a typing indicator (... bubble), and starts a 1s debounce to batch rapid messages
3. handleInboundMessage resolves the user, fetches conversation history, checks Google OAuth tokens, then calls the LLM
4. LLM agent loop (Vercel AI SDK + Claude via Bedrock) generates a response, with access to tools: send_sms, send_dm, Google Calendar/Gmail/Contacts, sandbox code execution (cmux), image generation, etc.
5. Reply goes back through Sendblue → iMessage to your phone

Features

• iMessage native — talks to you in your normal texting app, no downloads needed
• Group chats — David can be added to iMessage groups, decides whether to respond or stay quiet
• Google integration — OAuth flow via SMS link, then David can read/create calendar events, search/send/draft emails, search contacts
• Code execution — sandboxed code execution via cmux for running code snippets
• Image generation — can generate images on request
• Conversation memory — maintains context across messages with debounced batching

Tech stack

• Frontend: Next.js (landing page at textdavid.com)
• Backend: Convex (real-time database + serverless functions)
• Messaging: Sendblue (iMessage API)
• AI: Claude via AWS Bedrock + Vercel AI SDK
• Integrations: Google Calendar, Gmail, Contacts (OAuth 2.0)

Development

bun install
bun dev

Dev server runs on port 7749.