Our product is very simple:
a) Scrap ads b) Display ads c) Sell subscription to customers.
Advertisers pay to spy on competitors' ad, surprisingly it's quite easy to build if you know how to scrap and implement a search on top of it.
Scraping costs $10 per customer and we sell it to customers for $159 per month.
Then there’s the usual suspects with predefined technology definitions (builtwith, similartech, datanyze).
Last but not least I’m also building such a product and will be launching next month.
I would love to discuss your needs and see if we can accommodate them - you can reach out to me at mg@locatetech.io
I'm glad I only wasted $49 and didn't opt for the annual license.
They were also able to customize our search and extract specific data from the page. pretty advanced stuff.
Our use case was different, though, we wanted to find websites using a javascript library, and then run a javascript function on all of those sites to extract account information and specific html patterns.
But yes, their larger custom reports index did the trick, would recommend.