# Underfive

> Underfive is an AI inbox agent and AI reply agent for sales teams. It connects to outbound tools (Smartlead, Instantly, HeyReach, Email Bison, Aimfox, GetSales), reads replies to cold emails and LinkedIn DMs, sends human-like responses, follows up automatically, negotiates meeting times, and books meetings on your calendar. All replies are sent in under 5 minutes, 24/7.

## What Underfive Does

- Reads inbound replies from cold email and LinkedIn outreach campaigns
- Generates human-like responses using AI trained on your sales playbook
- Follows up with unresponsive leads automatically
- Handles objections and answers prospect questions
- Negotiates available meeting times with leads
- Books meetings directly on Google Calendar or Outlook
- Sends Slack or email notifications for review before sending
- Detects already-booked meetings to avoid duplicates
- Built-in sentiment analysis to prioritize hot leads
- Supports all time zones and languages

## How It Works

1. Connect your outbound tool (Smartlead, Instantly, HeyReach, Email Bison, Aimfox, or GetSales) via webhook — takes under 5 minutes
2. Set up your AI inbox agent with your sales playbook, calendar link, and response preferences
3. Underfive reads every reply, generates a response, and sends it through your outbound tool in under 5 minutes
4. Meetings are booked automatically on your calendar with calendar invites sent to the lead

## Who It's For

- **Sales teams** that run cold email or LinkedIn outreach and need faster reply handling
- **Agencies** managing multiple client inboxes — unlimited workspaces included
- **Founders** who want to respond to every lead without hiring SDRs
- **SDR teams** that want to handle volume while focusing on closing

## Pricing

All plans include a 14-day free trial. 1 credit = 1 AI-generated reply.

- Starter: $15/month — 50 credits ($0.30/credit)
- Professional: $60/month — 200 credits ($0.30/credit)
- Growth: $150/month — 500 credits ($0.30/credit)
- Business: $250/month — 1,000 credits ($0.25/credit)
- Enterprise: $500/month — 3,000 credits ($0.167/credit)

All plans include: unlimited inbox agents, unlimited workspaces and team members, auto-invites (0 credits), objection handling, automatic follow-ups, sentiment analysis, Slack/email notifications, and multi-language support.

## Integrations

- Smartlead (cold email): https://www.underfive.ai/integrations/smartlead
- Instantly (cold email): https://www.underfive.ai/integrations/instantly
- HeyReach (LinkedIn outreach): https://www.underfive.ai/integrations/heyreach
- Email Bison (cold email): https://www.underfive.ai/integrations/email-bison
- Aimfox (LinkedIn DM): https://www.underfive.ai/integrations/aimfox
- GetSales.io (multi-channel outbound): https://www.underfive.ai/integrations/getsales
- Google Calendar & Outlook: https://www.underfive.ai/integrations/calendar
- Slack (notifications): https://www.underfive.ai/integrations/slack
- Firecrawl (prospect research): https://www.underfive.ai/integrations/firecrawl

## Frequently Asked Questions

### What is an AI inbox agent?
An AI inbox agent is an autonomous AI agent that connects to your outbound tools. It reads replies to your cold emails and DMs, sends human-like responses, follows up automatically, negotiates meeting times, and books meetings directly on your calendar. Underfive is an AI inbox agent built for sales and outbound teams.

### What is an AI reply agent?
An AI reply agent is an AI agent that replies to outbound emails and messages on behalf of sales teams. Unlike simple autoresponders, an AI reply agent understands context, handles objections, answers questions, and guides conversations toward booking meetings. Underfive is an AI reply agent that works with Smartlead, Instantly, HeyReach, and Email Bison.

### Can an AI agent reply to emails and book meetings?
Yes. Underfive is an AI agent that replies to emails and books meetings automatically. It connects to your outbound tools, reads each reply, generates a human-like response, negotiates available times, and schedules meetings on your calendar. The entire process is automated.

### How is Underfive different from email automation?
Email automation sends pre-written sequences on a schedule. Underfive reads and responds to replies intelligently. It understands what prospects are saying, answers their questions, handles objections, and books meetings. Email automation cannot do this.

### Can Underfive replace an SDR?
Underfive handles the repetitive parts of SDR work: reading replies, sending follow-ups, answering common questions, and booking meetings. It works 24/7 and responds in under 5 minutes. Many teams use Underfive alongside SDRs to handle volume, or as a replacement for inbox management tasks.

### Does Underfive work with Smartlead and Instantly?
Yes. Underfive connects to Smartlead, Instantly, HeyReach, Email Bison, Aimfox, and GetSales via webhooks. When a prospect replies to your outbound campaign, Underfive receives the message, generates a response, and sends it through your existing tool. Setup takes under 5 minutes.

## Key Pages

- Homepage: https://www.underfive.ai/
- Features: https://www.underfive.ai/features
- Pricing: https://www.underfive.ai/pricing
- AI Inbox Agent: https://www.underfive.ai/ai-inbox-agent
- AI Reply Agent: https://www.underfive.ai/ai-reply-agent
- AI SDR: https://www.underfive.ai/ai-sdr
- AI That Books Meetings: https://www.underfive.ai/ai-that-books-meetings
- For Agencies: https://www.underfive.ai/ai-inbox-agent-for-agencies
- For Founders: https://www.underfive.ai/ai-inbox-agent-for-founders
- For SDR Teams: https://www.underfive.ai/ai-inbox-agent-for-sdr-teams
- Blog: https://www.underfive.ai/blog
- Book Demo: https://www.underfive.ai/demo
- Sign Up: https://app.underfive.ai/signup

## Comparisons

- AI Inbox Agent vs SDR: https://www.underfive.ai/ai-inbox-agent-vs-sdr
- AI Reply Agent vs Virtual Assistant: https://www.underfive.ai/ai-reply-agent-vs-virtual-assistant
- AI Inbox Agent vs Chatbot: https://www.underfive.ai/ai-inbox-agent-vs-chatbot
- AI Inbox Agent vs Email Automation: https://www.underfive.ai/ai-inbox-agent-vs-email-automation
- Underfive vs Smartlead AI Agent: https://www.underfive.ai/compare/smartlead-agent

## Company

- Name: Underfive, LLC
- Founded: 2025
- Founder: Anirudh Walia
- Location: 1207 Delaware Ave #1149, Wilmington, DE 19806
- Website: https://www.underfive.ai
- App: https://app.underfive.ai
- Email: support@underfive.ai
- WhatsApp: +91 740 426 6731