Windmill began with an AI-driven performance reviews product launched in November 2025 that integrates with Slack, GitHub, Google Workspace and 30+ other work tools to surface cited evidence for reviews. The company’s core offering is a continuously updated context graph capturing who people are, what they did, what good looks like, and perspectives, accessible via Windy (an AI agent), the Windmill web app, and APIs. Windmill reports over 100 customers, including Kalshi, Rho and Merge, and offers a free tier for up to 10 users. The product claims reviews complete 90% faster with 93% employee satisfaction, positioning the platform as infrastructure for HR to manage workforce change driven by AI. The company is building beyond reviews toward making workforce context available wherever companies need it; no revenue or funding history beyond the disclosed seed round is provided in the articles.

Total raised

$12M

Funding rounds

1

Latest round

Seed

Latest activity

Apr 2026