Inkbox Raises $5.3 Million to Bring Persistent AI Agents to Communication Channels

San Francisco startup Inkbox raised $5.3 million in seed funding and launched AI agents that keep files, tools and work context on cloud computers between sessions.

Inkbox announced the round Tuesday, Nov. 10. Peak XV led it, with Guillermo Rauch, Henri Stern, Jonathan Frankle, Cristina Cordova and Dan Levine also participating.

Inkbox says its agents can connect with email, iMessage, WhatsApp and Slack. They can activate when a message or task arrives, run scheduled jobs and enter idle mode when no work is pending. The company says each agent retains its files, installed software and accumulated context for later sessions.

The service uses a unified API layer designed to keep an agent’s identity consistent across communication channels. The founders built it to address the separate logins, two-factor authentication and integrations involved in connecting agents to different services.

Inkbox also provides a credential vault for agents to access services without storing passwords in plain text. A provisional workspace process lets agents register for services themselves.

Ray Liao, Alex Wilcox and Dima Vremenko founded Inkbox in San Francisco in 2025. The company joined Y Combinator’s Summer 2026 cohort. By September, its annual recurring revenue run rate had reached $300,000, a figure it achieved within four months of its Y Combinator launch.