Send AI lead follow-up SMS with GPT-4.1, Google Sheets, Twilio and Gmail

How it works

• Triggered when a lead submits your website contact form via webhook
• Logs the lead's Name, Phone, Email, and Interest to Google Sheets
• GPT-4.1 generates a personalised SMS and sends it instantly via Twilio
• Waits 2 hours, then checks if the lead has replied (via Google Sheets)
• If replied: notifies you via Gmail. If not: sends an AI follow-up SMS

Set up steps

• Add your OpenAI API key to both OpenAI nodes (model: GPT-4.1)
• Connect your Twilio account (Account SID + Auth Token) in both SMS nodes
• Link Google Sheets via OAuth and set your sheet with columns: Name, Phone, Email, Interest, Replied
• Connect Gmail via OAuth for owner notifications
• Paste the webhook URL into your website contact form as the POST endpoint
• Manually update the Replied column to Yes in Google Sheets when a lead responds