Web analyzer and comparison is giving us results

I am working on web comparison tool. Great for staying at hand while remaking or redesigning a website, but also as a final report to you and your client.

We need it for this bigger website with a large chunk of historical links. I want to give my client a proper report showing status of the website before and after. Although they feel the difference, seeing the numbers will be stronger. And it will confirm to me that we didn't forget anything.

I already worked with that tool during development. Because I am able to quickly rescan certain pages during crawling, I iterated very fast in finding errors, reimporting, validating.

Now I want to finish reporting into PDF for the client and spreadsheets for development or SEO departments. And technically optimize it for larger speed.

I got asked before why not ScreamingFrog or others. Because I want to compare real time, not wait for few hours to crawl and validate couple hundred thounsands pages websites X 2 and I want an assitant, not just a report.