Polar raised $5.7M for an AI browser that runs multi-hour tasks logged in as you: 4.5M actions in seven months.

Founded by Kevin Jiang, who worked on Perplexity's Comet, with Vishaal Ram and Howard Zhong, led by Madrona with angels including former GitHub CEO Thomas Dohmke and Modal founder Erik Bernhardsson. The architecture is the interesting part: rather than integrating per-app, Polar clicks and types through sites the user is already authenticated into, running multi-step tasks from minutes to hours. Free with daily AI task credits, $20/month for higher limits. Session-borrowing at the browser layer is a direct threat to any point-solution SaaS whose moat is an integration rather than data.