SEO Startups funded by Y Combinator (YC) 2026

Siftly helps brands measure, improve, and scale their visibility inside AI assistants like ChatGPT, Gemini, and Perplexity. We track how your brand is surfaced, compared, and recommended and give you actionable insights to win AI-driven discovery. Think of it as SEO for the AI era, built for B2B, B2C, D2C, and e-commerce growth teams.

DemandSphere enables ecommerce and programmatic SEO teams, both in-house and agency, to drive more traffic from organic search. Our DemandMetrics platform is our core monitoring platform that turns massive amounts of SERP and market data into prioritized insights for growth. Our SERP Intelligence data warehouse accelerates our customer's ability to detect and respond to changes in the search landscape.

Start, grow, and scale your inbound marketing and SEO strategy with a toolset optimized for results — not vanity metrics. Our goal is to connect the workflow from end to end, from keyword research to analytics, and the actions that users take that ultimately drive revenue for a business.