An AI appointment setter that books the meeting, not just the reply.
An AI appointment setter is software that answers interested prospects for you and turns the conversation into a booked meeting. Underfive reads every reply, responds in under 5 minutes in your voice, offers real times from your calendar, handles objections and reschedules, and sends the invite. You show up to the call.
50 free credits · no credit card · updated October 2026
Most "AI SDR" tools write the first email. The hard part is what happens after someone replies: a question about pricing, a "maybe next week", three time zones. That is where meetings are won or lost, and it is the part Underfive automates.
How does it work?
- 1
Connect where replies arrive
Link your sequencer or mailbox. Every email and LinkedIn reply lands in one Unified Inbox.
- 2
Teach it your offer
Point the agent at your site, pricing and FAQs, and connect the calendar it should book into.
- 3
It sets the appointment
Interested replies get an answer in minutes, real times, and an invite once a time is agreed.
How does it compare?
| Underfive AI setter | Human appointment setter | Booking link only | |
|---|---|---|---|
| First response | Under 5 minutes, 24/7 | Working hours | Instant, but no answer to questions |
| Handles questions and objections | Yes, from your knowledge base | Yes | No |
| Negotiates times | Yes, against real availability | Yes | Prospect has to pick |
| Follows up when it goes quiet | Yes, automatically | If they remember | No |
| Cost | From $60 a month | Salary or commission per meeting | Free, lower conversion |
What you get with Underfive
Real availability
Times come from Google Calendar, Outlook, Calendly, Cal.com, HubSpot or GoHighLevel, so it never offers a slot you can't take.
Your voice, your rules
Replies are written from your knowledge base, and any category can require approval first.
Every channel
Cold email and LinkedIn replies are handled in the same inbox.
Nothing slips
Quiet threads get a follow-up, and "not right now" waits for the date the prospect gave.
Learn more Meeting booking →Inbox agents →Pricing →
Frequently asked questions
What is an AI appointment setter?
Software that answers interested prospects and books meetings for you. It reads each reply, responds in your voice, proposes real times from your calendar, handles the back-and-forth and sends the invite.
Can an AI appointment setter replace a human setter?
It replaces the repetitive part: answering replies, follow-ups, scheduling and rescheduling, 24/7 and in minutes. Many teams keep a human for calls and use approvals for sensitive replies.
Which calendars can it book into?
Underfive books into Google Calendar, Outlook, Calendly, Cal.com, HubSpot or GoHighLevel.
Will prospects know it is AI?
Replies are written in your voice from your own knowledge base and sent from your original mailbox or LinkedIn profile. You can require approval on any category before anything is sent.
How much does an AI appointment setter cost?
Underfive plans start at $60 a month with unlimited inbox agents and team members. You can start with 50 free credits and no credit card.