Question: Is there a database that lists websites by the technologies they use, and allows me to contact them?

If you want a database of websites indexed by the technology they use and that lets you reach out to them, Simulai is a great option. Simulai is an information retrieval system geared for targeted outreach, letting you search for and contact websites based on the technology you're interested in. It indexes a database of 35 million websites across more than 3,000 technologies, so it's very good at finding and contacting technology-specific websites. The service also lets you set up complex search queries and get feedback on new technologies you might want to track, so it's good for businesses, startups and marketing people.

Another contender is Wappalyzer, which is geared specifically for finding out the technology stacks of any website. It offers website profiling, lead generation and competitor analysis, and tracks 5,126 web technologies in 103 categories. Integrations with sales and marketing tools like Salesforce and HubSpot let you dovetail it into your workflow, and several pricing tiers, including Pro and Business, are available. That makes Wappalyzer a good option for sales and marketing teams that want to get a handle on the technology world.

For developers, digital marketers and technology strategists, TechPeeker lets you quickly identify a website's technology stack and generate reports about its technology. It's geared to give you competitive intelligence and optimization ideas, so it's a good option for those who need more technical details. TechPeeker's interface is designed to be easy to use, and custom data options mean it's good for people of all backgrounds, too, so it can give you a competitive edge in the digital world.

Last, Lusha is worth a look if you're looking for a more general-purpose tool for sales teams. Lusha offers premium data, connecting to social networks, web sources and Salesforce, and offers features like Intent, Job Change Filter and Technology Filter. It also offers Data Enrichment, Buyer Intelligence and a powerful API for custom enrichment and automation. More than 280,000 revenue teams use Lusha, so you should be able to find and contact technology-specific websites.