Unisson

Unisson (YC W26) is a San Francisco startup building AI agents that act as hands-on product experts for customer-facing teams at B2B software companies. Its agents learn to use a client's product in about 15 minutes by exploring the interface and codebase, then work alongside implementation, customer success, and sales engineering teams inside Slack, email, and text to run onboarding, migrations, integrations, audits, and change management. Founded in 2026 by Varun Mathur and Tom Achache, the company charges only when its agents are actively doing work.