OpenAI Vision CRO Audit Workflow: n8n Form, Gmail & Sheets

Get an OpenAI-powered CRO audit in minutes—using your landing page URL, a screenshot, and a scored report saved to Google Sheets.

This n8n workflow automates a full Conversion Rate Optimization (CRO) audit by collecting a landing page URL via an n8n Form, analyzing the page visually with OpenAI Vision, generating a structured audit using an OpenAI agent, logging results to Google Sheets, and optionally emailing the report through Gmail.

What this workflow does

• 1) Collect input via n8n Form Trigger: receives a landing page URL and an optional recipient email.
• 2) Scrape HTML + capture a screenshot: fetches the landing page HTML and captures a live screenshot using the thum.io screenshot URL.
• 3) Analyze visuals with OpenAI Vision: generates a visual breakdown focused on conversion-relevant elements (e.g., hierarchy, CTA prominence, trust signals, clutter, and mobile cues).
• 4) Generate a scored CRO audit: sends truncated HTML plus the visual analysis to an OpenAI agent to produce category scores, a Markdown “roast,” and a fixed number of specific recommendations.
• 5) Report + logging: formats the audit as a Markdown report, converts it to HTML, and appends key fields to a Google Sheets audit log.
• 6) Optional email: if enabled and an email address is provided, sends the formatted HTML report via Gmail.

Use cases

• SaaS teams running ongoing landing page CRO reviews without manual audits.
• Automation engineers building a repeatable OpenAI Vision audit pipeline in n8n.
• Marketers who want scored recommendations tracked over time in Google Sheets.

Technical details

• Triggers/controls: n8n Form Trigger, if, set
• Vision + AI: OpenAI Vision model for screenshot analysis; OpenAI agent for the CRO audit
• Reporting: markdown conversion to HTML; formatted report output
• Integrations: Google Sheets for audit logging; Gmail (OAuth2) for email delivery
• Workflow helpers: sticky note for documentation inside the automation