Find websites that use a given SaaS/tool. Pick “Shopify” or “Segment” and get a fresh list of detected sites with filters by industry, tech stack and traffic bands. Useful for competitor intel and outbound prospecting. Reverse-first UI on top of tech-detection crawls.
Platform: web
Outbound sales people, competitive-intel analysts and growth marketers need fresh, accurate lists of sites that run on – or have recently installed – specific SaaS products (Shopify, Segment, HubSpot, etc.).
BuiltWith, Wappalyzer and Datanyze already crawl the web for technology tags, but their workflows are tech-first: you start with a domain and see its stack. Reverse SaaS Finder flips the flow: pick a SaaS → instantly get a filtered lead list (industry, traffic tier, other tech, geo, new installs, etc.).
Paid incumbents – proof people pay: – BuiltWith: $295 – $995 /mo (7-figure ARR; public testimonials) – Wappalyzer: $149 /mo lists; $0.20 per lead API; YC backed – SimilarTech, Datanyze, Snov.io TechChecker, Slintel, Clearbit Reveal, Apollo “Technographics” add-on. Paying competition = validated willingness to pay.
Forum demand: – Reddit post linked by the user (“Is there a tool that can tell me all the websites that use…”) 200+ upvotes & comments asking for cheaper/easier alternatives. – Numerous cold-email playbooks on GrowthHackers / r/sales / indie-hackers mentioning “I export BuiltWith but it’s pricey /...