SEO Startups funded by Y Combinator (YC) 2026

Coding agents like Claude Code, Codex and Cursor now decide which tools get installed in a codebase. Armature runs the real agents inside a panel of realistic repositories, measures whether they pick you, and works with your team on the docs, SDK and content changes that make them choose you. Every change is tested on real agent runs before it ships. Once agents use your product, Armature shows you what users do with it through AI, with self-serve MCP analytics and evals that catch regressions before your users see them.

Openbenchmarks runs open, independent benchmarks across APIs, vendors and tools. Helping teams fairly evaluate vendors. We offer private benchmarking & analytics tools to help you measure your product against competitors, see exactly where you fall short, and fix it.

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.