Penumbra Holdings builds AI-powered tools that integrate with your existing services through the Model Context Protocol. Sign in, connect your accounts, and use natural language to take actions across all of them.
Penumbra Holdings Inc is a technology company based in San Francisco, California. We build AI-powered assistant products that connect to third-party applications and services on your behalf -- you authenticate with your existing accounts, and our platform lets you interact with them through natural language conversation.
Our platform supports integrations with productivity tools, financial platforms, communication apps, e-commerce services, and more. You connect accounts through standard OAuth authentication and then use our assistant to perform actions, pull information, and tie workflows together across your connected apps.
Sign in with your phone number. Connect your third-party accounts -- email, calendar, finance, productivity tools, whatever you use. Then interact with all of them through a single chat interface. Our platform uses the Model Context Protocol (MCP) to securely communicate with connected services on your behalf.
Some things people use Penumbra Holdings products for:
Penumbra Holdings uses phone number verification to authenticate users. When you sign up or sign in, we send a one-time verification code to your phone via text message. This is the only type of SMS message Penumbra Holdings sends.
Questions about Penumbra Holdings, our SMS messaging, or your account:
support@penumbraholdings.com
(916) 799-5790
1513 Pershing Dr, Unit A, San Francisco, CA 94129