Stop losing leads
while you sleep.
Harvard Business Review found companies took 42 hours on average to answer a new inquiry — and that answering within the hour made reaching the decision-maker about seven times more likely. Katherine picks up on the first ring.
Every missed call is a missed client.
The research is old but consistent: most calls to small businesses are never picked up, and the first to respond usually wins.
of calls to small businesses went unanswered or to voicemail
411 Locals study of 85 businesses, 2016better odds of reaching a new lead when you call back in 5 minutes rather than 30
MIT and InsideSales.com, 2007more likely to reach the decision-maker when a business responds within the hour
Harvard Business Review, 2011Phone rings at 7pm on Friday.
Goes to voicemail.
Caller Googles "similar business near me" and calls your competitor.
You see a missed call Monday morning.
The deal is already lost.
Phone rings at 7pm on Friday.
Katherine answers on the first ring.
Qualifies the caller. Books a consultation for Tuesday.
You wake up Monday to a confirmed appointment in your calendar.
The deal is already yours.
An AI receptionist
briefed on your trade.
Katherine isn't a phone tree. For each trade she is given a short brief: what callers usually ring about, which calls are emergencies, what to write down, and what she must never say.
What "industry-specialized" actually means
HVAC
Treats no heat in freezing weather or no AC in extreme heat as an emergency. Takes the address, system type, heating or cooling, and warranty and agreement status. Never quotes a repair price.
Roofing
Treats water coming through the ceiling as urgent. Asks whether it is storm or hail damage, whether a claim is filed, and with which carrier. Offers the inspection instead of a price.
Plumbing
Treats running water, sewage backing up or a gas smell as an emergency and tells the caller to shut off the main. Takes the address and what is leaking or blocked.
Electrical
Treats a burning smell, sparking or a hot panel as an emergency and tells the caller to shut the breaker off. Never talks anyone through a repair.
General Contractor
Takes the project address, the kind of work, rough scope and timing for a bid. For a job already running, takes the name and address for the right person.
Landscaping
Asks residential or commercial and takes the property address for an estimate. Treats a burst irrigation line as urgent and tells the caller to shut it off.
Legal
Takes the kind of matter and how to reach the caller. Never gives legal advice, and never confirms whether someone the caller names is also a client.
Any other business
Takes the name, the best number and what the call is about. Treats anything that sounds like an emergency as urgent, and never quotes a price.
Answers with your business name and tone — around the clock, if you want her to
Asks the questions your trade needs answered, and writes the answers down
Books appointments into the open times on your Google Calendar
Takes messages, puts callers through to you, and texts you when a call needs you
Transcribes and summarizes every call in your dashboard
Hook up your website form and she calls new inquiries back within about a minute
Hear Katherine right now
Call our live demo line. She'll answer your questions about CortexaOS, and can start a free trial for you on the same call.
If your average client is worth $2,500 and you miss 4 calls a month — that's $10,000/month in revenue at risk. At $149/mo for CortexaOS Starter, recovering just one of those clients a month returns about 17 times the subscription.
7×
more likely to reach the decision-maker when a business responds within the hour
Harvard Business Review, 2011
The fortune is in the follow-up.
Your AI does it automatically.
Most businesses fail not because their product is bad — but because no one followed up. That problem is now solved.
Responds to new leads in minutes, not hours — while intent is still hot
Sends personalized follow-up sequences based on how the lead came in
Nurtures cold leads for 30, 60, 90 days without any manual effort
Sends appointment reminders so fewer customers forget
Re-engages dead leads with win-back campaigns at the right moment
Escalates hot leads to you in real time with full conversation context
20 leads/month. 30% going cold from slow follow-up = 6 lost leads. At an average deal of $1,500, that's $9,000/month you're leaving behind. Your Follow-Up Agent is working on all 20 from the moment they inquire — at any hour.
Together, they close the entire loop.
From first contact to signed deal — fully automated, fully on-brand.
Inquiry
A prospect reaches out — any channel, any hour
AI Receptionist answers
Instantly. Professionally. In your voice.
Lead qualified
Smart questions filter out tire-kickers automatically
Follow-Up Agent nurtures
Multi-touch sequences keep you top of mind for weeks
Appointment booked
Directly into your calendar — you just show up
Deal closed
You get paid. The loop begins again.
"Every other tool in CortexaOS is a bonus. These two alone justify the subscription."
On her own, or by the minute
on a CortexaOS plan.
Just need a receptionist? Hire Katherine on her own. Running your business on CortexaOS? She is on every plan, billed by the minute, with lower rates at higher tiers.
Katherine on her own — $49/mo
Includes 150 minutes, then $0.30 a minute. 7-day free trial with your first 100 minutes free — card at sign-up. US businesses only.
On a CortexaOS plan she is billed by the minute, and the platform's 14-day free trial needs no card.
Starter
$149/mo
$199/mo
Annual billing
Operator
$249.99/mo
$299.99/mo
Annual billing
Team
$399/mo
$499/mo
Annual billing
Enterprise
Custom
Contact us
Plan prices shown are billed annually; month-to-month is 10% more. The promo price can be locked for up to 3 annual terms.
How Katherine compares to AI voice platforms
Price per minute is only half the story.
| Provider | Price/min | Industry depth | What you get |
|---|---|---|---|
| Bland.ai | $0.12–$0.14 | Build it yourself | A developer platform. The phone line is billed separately. |
| Vapi | $0.05 + usage | Build it yourself | $0.05 is the platform fee alone; the AI model, voice and phone line are billed on top. |
| Retell AI | $0.07–$0.31 | Build it yourself | Depends on the AI model and voice chosen, plus $2/mo per phone number. |
| Katherine (CortexaOS) | $0.20–$0.30 | Ready to answer | Everything included: phone number, voice, a brief for your trade, Google Calendar booking, and a summary of every call — plus the rest of CortexaOS on a platform plan. |
The platforms above cost less per minute because you build the receptionist yourself — the instructions, the calendar hookup and the phone number. Katherine arrives built. Their prices are from each company's own pricing page, checked September 2026.
Frequently asked questions
Everything you need to know before you start.
Does Katherine actually answer my business phone?
Yes. You forward your business line to the number we give you, and she answers in real time with your business name and tone. She tells every caller up front that she is an AI assistant and that the call is recorded.
Can I customize what she says and asks?
Yes. She builds her answers from your website, and you can edit your services, hours and common questions. Connect Google Calendar so she can book into your open times, and choose when calls are put through to you.
Does she answer around the clock?
She can. You set your business hours, and you choose what happens outside them: let Katherine answer, forward the call to you, or send it to voicemail. Voicemail is where calls go until you change it.
How long does the Follow-Up Agent follow up?
Configurable — default sequences run 30 days with smart spacing. You can extend to 90 days, modify the cadence, or create vertical-specific sequences.
How does the pricing work?
Bought on her own, Katherine is $49/month including 150 minutes, then $0.30 a minute, with a 7-day free trial with your first 100 minutes free — card at sign-up, cancel any time before it ends. On a CortexaOS plan she is billed by the minute instead — $0.30/min on Starter, $0.25/min on Operator, $0.20/min on Team, and contract pricing on Enterprise — under CortexaOS's 14-day free trial, which needs no card.
Is Katherine available on every CortexaOS plan?
Yes, billed by the minute on every paid plan ($0.30/min on Starter, $0.25/min on Operator, $0.20/min on Team). The AI Follow-Up Agent is included on every plan too.
Your competitors who respond faster are winning your leads.
That stops today.
$49/mo on her own · first 100 minutes free · card at sign-up, cancel any time in the first 7 days.
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