đź’ˇ SaaS Idea: SaaS Footprint Finder (Reverse BuiltWith)
Prospecting intelligence: search and monitor all websites that use a given SaaS (script, SDK, tag). Crawl signatures + JS hash detection, filters (geo, tech stack, traffic bands), exports, and alerts. Built for SDRs, partnerships, and competitive intel.
Platform: web
Why it's a good idea?
1. Problem & Existing Demand
We looked for intent-driven queries that imply someone wants a list of sites using a given SaaS/technology.
| Seed query |
Monthly volume |
KD (difficulty) |
| builtwith |
27 100 |
22 |
| wappalyzer |
8 100 |
23 |
| builtwith alternative |
210 |
0 |
| website technology checker |
480 |
44 |
| companies using Salesforce |
320 |
24 |
| shopify stores list |
390 |
16 |
| how to find Shopify stores |
210 |
12 |
| sites using Stripe |
50 |
7 |
Take-away:
- Head keywords around tech-lookup tools easily clear the “>500 search” rule (BuiltWith, Wappalyzer). Long-tails for individual SaaS («companies using X», «list of X customers») are lower per term (<500) but exist for thousands of SaaS; aggregate demand is large.
- «builtwith alternative» (210 vol, KD 0) shows people actively search for a different solution ⇒ problem not fully solved.
2. Evidence of People Actively Asking
- Reddit thread supplied by the user (r/MarketingResearch) explicitly asks _“Is there a tool that can tell me all websites using __?” (up-votes & comments requesting it).
- Similar threads on r/sales, r/sdr, IndieHackers, HN ask „How can I get a list of webs...
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