How to Compare Before and After Changes with ChatGPT
Measure deployment impact with ChatGPT and ToolRouter. Before/after Lighthouse comparison in one chat.
Tool
ChatGPT compares Lighthouse scores before and after your deployment and generates a clear impact report. It visualizes score changes, explains what drove improvements or regressions, and creates stakeholder-ready summaries that justify performance investments. This is ideal for teams that need to demonstrate the ROI of optimization work.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
Steps
Once connected (see setup above), use the Lighthouse Audit tool:
- Before changes: "Audit mysite.com/page with Lighthouse and record the baseline"
- Make and deploy your changes
- After changes: "Re-audit mysite.com/page and compare with the baseline"
- ChatGPT shows improvements and regressions in a clear comparison format
Example Prompt
Try this with ChatGPT using the Lighthouse Audit tool
I just optimized our checkout page. Run Lighthouse on mysite.com/checkout and compare with the results from before the changes.
Tips
- ChatGPT formats comparisons as shareable tables for team updates
- Ask for a narrative summary of changes suitable for stakeholder reports
- Request recommendations if any metrics regressed unexpectedly