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

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1. Workflow Overview

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 ...

Best for

Lead Nurturing automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.respondtowebhook, n8n-nodes-base.googlesheets, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.twilio, n8n-nodes-base.wait, n8n-nodes-base.if, n8n-nodes-base.gmail

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Meet Soni.

Original n8n.io source

1.1 Workflow description

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

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Webhook - Lead Form Trigger

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2

Block 2 - Respond to Webhook

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1

Block 3 - Google Sheets - Log Lead

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 4 - OpenAI - Generate Personalized SMS

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.4

Block 5 - Twilio - Send First SMS

Type / Role: n8n-nodes-base.twilio - twilio
Config choices: Version 1

Block 6 - Wait - 2 Hours

Type / Role: n8n-nodes-base.wait - wait
Config choices: Version 1

Block 7 - Google Sheets - Check Reply Status

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 8 - IF - Has Lead Replied?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2

Block 9 - OpenAI - Generate Follow-Up SMS

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.4

Block 10 - Twilio - Send Follow-Up SMS

Type / Role: n8n-nodes-base.twilio - twilio
Config choices: Version 1

Block 11 - Send a message

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.2

Block 12 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 13 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 14 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 15 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Send AI lead follow-up SMS with GPT-4.1, Google Sheets, Twilio and Gmail
Complexity	advanced
Nodes	16
Categories	Lead Nurturing, AI Chatbot
Author	Meet Soni
Published	27 Apr 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15323/15323.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Lead Nurturing workflows AI Chatbot workflows

Frequently asked questions

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

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Lead Nurturing, AI Chatbot use case.

Meet Soni

3 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.respondtowebhook n8n-nodes-base.googlesheets @n8n/n8n-nodes-langchain.openai n8n-nodes-base.twilio n8n-nodes-base.wait n8n-nodes-base.if n8n-nodes-base.gmail

Complexity

advanced

Published 27 Apr 2026

Likes 0

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Install path: /data/workflows/15323/15323.json

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

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

How it works

Set up steps

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Webhook - Lead Form Trigger

Block 2 - Respond to Webhook

Block 3 - Google Sheets - Log Lead

Block 4 - OpenAI - Generate Personalized SMS

Block 5 - Twilio - Send First SMS

Block 6 - Wait - 2 Hours

Block 7 - Google Sheets - Check Reply Status

Block 8 - IF - Has Lead Replied?

Block 9 - OpenAI - Generate Follow-Up SMS

Block 10 - Twilio - Send Follow-Up SMS

Block 11 - Send a message

Block 12 - Sticky Note

Block 13 - Sticky Note1

Block 14 - Sticky Note2

Block 15 - Sticky Note3

Block 16 - Sticky Note4

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions