AI Inbox Agent for Founders
Founders use Underfive as an AI inbox agent to handle lead responses while focusing on building their company. Reply to every lead in under 5 minutes without hiring.
Inbox Problems Founders Face
No Time to Reply
You're building product, talking to customers, and fundraising. Responding to cold email replies falls to the bottom of the list. Leads go cold.
Can't Afford an SDR
An SDR costs $60K+ per year. Most early-stage founders can't justify that expense. But someone needs to reply to leads.
Leads Slip Through
When you're busy, leads reply and don't hear back for days. By then, they've moved on. Slow responses kill deals.
Inconsistent Follow-Up
Following up manually is a chore. You forget. You get busy. Leads who showed interest never hear from you again.
How Founders Use Underfive as an AI Inbox Agent
Set Up in 5 Minutes
Connect your Smartlead, Instantly, or Email Bison account. Configure your calendar. Underfive starts replying immediately.
Instant Responses 24/7
Every lead gets a reply in under 5 minutes. Nights, weekends, holidays. The AI inbox agent never sleeps.
Focus on What Matters
Stop context-switching to reply to emails. The AI inbox agent handles responses while you focus on building.
Meetings Booked Automatically
The AI inbox agent negotiates times and adds meetings to your calendar. You just show up.
More Pipeline, Less Work
Convert more leads without spending time on email. The AI inbox agent turns responses into meetings.
Outcomes for Founders
Handle inbox responses without the $60K+ SDR salary.
Stop checking email. The AI inbox agent handles it.
Fast responses convert more leads into meetings.
Let an AI Inbox Agent Handle Your Leads
Start with 50 free replies. No SDR required.
Start Free Trial →