Problem & Idea

Sales and growth teams constantly ask "Which companies use X?" in order to do account-based outreach. The proposed product is a “Reverse BuiltWith” that:

• Lets user pick any SaaS / library / CMS (e.g. HubSpot, Shopify, Stripe…)
• Returns a deduped list of domains using it, enriched with firmographics (size, industry, geo, est. traffic)
• Continuously tracks adoption / churn so reps get real-time intent triggers
• Can be filtered/exported for cold-outreach or ad-targeting.

Demand Signals (Forums)

• Reddit r/MarketingResearch thread (link in prompt) literally asks for such a tool and has >120 up-votes / 40+ comments.
• r/SalesOperations, r/LeadGeneration, r/Entrepreneur contain recurring “BuiltWith alternatives?” and “How do I find companies that use ___?” threads (dozens of posts in 2023-2025).
• Users routinely complain that BuiltWith lists are expensive ($295 – $995/mo) and not clean; Wappalyzer lacks firmographics; ZoomInfo technographic filter costs >$10k/yr.

Keyword Research (representative low-difficulty queries)