"For AI and SaaS specifically, Ocean.io and Harmonic.ai give much better accuracy than Apollo. If you want to stick with Clay, run a waterfall: Start with Crunchbase/Apollo for initial firmographics, then enrich with BuiltWith or custom HTTP scrapers to detect tech stacks (like OpenAI/Claude API usage on their site
For standard SaaS/AI filters, ZoomInfo or Cognism are worth looking at. If you need more niche/custom company discovery, Clay is much more flexible.
We’re actually building Followerscrape around that niche discovery problem as well.