Automated Weekly Tech Stack Reporting via BuiltWith, GPT-4o, and Email - n8n Workflow

Competitive Analysts: Quickly monitor competitors' technology changes without manual checking.
Marketing Agencies: Generate quick, readable reports on client or prospect tech stacks.
SaaS Founders & Developers: Stay updated on industry standard platforms and tools.
n8n Automation Specialists: Users looking for advanced examples combining n8n trigger scheduling, API calls, custom code, and AI agents.

Manually researching and summarizing the technology stack of multiple websites every week is tedious and time-consuming. This specialized n8n workflow solves this by creating a zero-touch, AI-powered intelligence system.

It eliminates manual data extraction and complex data interpretation. This specific n8n template automatically fetches the domain list from a Google Sheet, hits the BuiltWith API to get raw data, and uses an advanced AI n8n node (GPT-4o-mini) to turn messy API results into professional, human-readable summaries. The final weekly report is delivered directly to your inbox via Gmail, making it one of the most efficient n8n automation solutions for market intelligence.

This n8n workflow follows a three-stage process: Data Collection, Intelligence Gathering, and Delivery.

1. Scheduled Start (n8n Trigger): The process begins automatically every Monday at 9 AM using the 'Weekly Trigger' n8n node.


2. Input Data Fetch: The workflow retrieves a list of target domains from a designated Google Sheets document.


3. API Call: For each domain, the 'Get Tech Stack (BuiltWith API)' n8n node makes an HTTP request to BuiltWith, retrieving the full technology fingerprint.


4. Data Cleanup: The raw JSON output from the API is parsed and cleaned using the 'Extract Tech Stack Info' n8n node (custom JavaScript), focusing only on the primary detected technologies for structured input.


5. AI Analysis: The extracted structured data is fed into the 'Generate Stack Summary (AI)' n8n node, which utilizes the connected 'OpenAI Chat Model' (GPT-4o-mini). The AI generates a natural-language summary of the detected tech stack.


6. Final Delivery: The fully analyzed and summarized report is sent to the specified recipient using the 'Send Summary Email' Gmail n8n node, completing the weekly automated cycle.

To deploy this powerful n8n workflow, follow these steps:

1. Import: Copy the provided JSON code and import it into your n8n instance as a new workflow.


2. Credentials Setup:

1. Configuration: Adjust the schedule time in the 'Weekly Trigger' n8n node if 9 AM Monday is not suitable.


2. Recipient Update: Change the recipient email address in the 'Send Summary Email' n8n node to your desired inbox.


3. Activate: Save the n8n workflow and set the toggle to 'Active'. The weekly report automation is now live.

Weekly Trigger (n8n trigger): Sets the automation schedule. Configured to run once per week, specifically on Monday at 9:00 AM, ensuring consistent reporting.
Fetch Domain List (Google Sheets): Reads input data. Connects to a Google Sheet to retrieve a column of website domains slated for analysis.
Get Tech Stack (BuiltWith API) (HTTP Request): Performs the data fetching. Uses the LOOKUP query parameter with an expression ={{ $json['Domain '] }} to dynamically pass each domain from Google Sheets to the BuiltWith API.
Extract Tech Stack Info (Code n8n node): Data transformation and preparation. This JavaScript n8n node parses the often complex and nested BuiltWith API response to extract the primary technology detected, simplifying the data structure before AI processing.
OpenAI Chat Model (LangChain LLM): Provides the language model backend. Configured to use the efficient gpt-4o-mini model for summary generation.
Generate Stack Summary (AI) (LangChain Agent): The intelligence layer. Takes the clean, extracted data and a prompt (e.g., "Provide summary of the data...") to generate a cohesive report using the AI model.

• Send Summary Email (Gmail n8n node): Final action. Uses the summary output from the AI node as the email body and sends the weekly report to a predefined email address.