LinearZeta answers every call.
We replace your outdated phone menu with a conversational AI voice agent that books appointments, gets you the after-hours callback, and recovers the business you're missing — 24/7, on the number you already have.
A missed call is a booked competitor.
For a local service business, the phone is the front door. But most calls arrive while you're with a customer, on a job, or closed for the night — so they hit a menu, a hold, or a voicemail nobody returns.
The caller doesn't wait. They call the next name on the list.
The problem isn't your team. It's that a 1990s phone tree can't hold a conversation, can't book an appointment, and can't work at 9pm on a Sunday. A conversational voice agent can.
One agent that answers like your best front desk.
It picks up on the first ring, every time. It answers the questions you get a hundred times a week, books appointments straight into your calendar, gets you the after-hours callback, and hands real emergencies to a human without missing a beat.
It also does the part most voice bots skip. A caller who wants to move or cancel an appointment doesn't need a confirmation number — the agent finds their booking, reads it back, and changes it. A regular who calls to book again gets offered their usual service — and on Square, the same person who did it last time. And a restaurant can take a full pickup order by phone, priced off its own menu.
You don't replace your phone number, your team, or your tools. We build the agent, deploy it on your existing line, and run it for you — so you keep the calls you're losing today.
Mapped. Bounded. Measured.
A four-step build that ends in a voice agent you can trust on the phone with your customers.
Map
We map every reason your phone rings — bookings, FAQs, emergencies, after-hours — and decide exactly how each call should end.
Build
We build and voice a conversational agent that knows your business, books into your calendar, and sounds like your front desk — not a robot.
Govern
Clear limits. It never invents prices or makes promises. Real emergencies and edge cases route to a human instantly — anything sensitive always goes to a person.
Measure
You see every call — answered, booked, escalated — in your own dashboard, with what those bookings were worth. A recap lands in your inbox every month.
Built on infrastructure you can trust.
The same telephony and voice technology that powers companies far larger than yours — assembled, governed, and run for a single line: yours.
Carrier-grade telephony
Your existing number stays put — or start fresh with a dedicated line we provide, your choice on any plan. Either way we connect it to the agent through Twilio, the platform behind millions of business phone lines, with no rip-and-replace of your phone system.
Natural, real-time voice
Sub-second, human-sounding speech via ElevenLabs. Callers have a real conversation — not a fight with a menu. It waits for people to finish instead of talking over them, and it filters out the shop noise, the TV, and the other customer at the counter so it hears the person on the phone.
Deployed like software, not edited by hand
Every agent is version-controlled and pushed through a tested pipeline. Changes are reviewed before they ever touch your live line — nothing is fiddled with in a dashboard during business hours.
Disclosure and data care built in
Every call opens by disclosing it's an AI and that the call is recorded. Caller data is minimized: the returning-caller record is keyed on a one-way hash, so the number itself is never readable there, and it's scoped to your business alone. Where you need to ring someone back — a callback request, a booked appointment — the name and number are kept in readable form for exactly that, on a retention limit, and deleted on request.
Nothing falls through
If your calendar is unreachable mid-call, the agent doesn't hang up on the caller — it takes their details and the callback request lands with you instead. If a slot gets taken while you're talking, it offers another real opening rather than a promise. And if the line drops mid-booking, it won't book the same person twice.
Watched around the clock
We monitor the whole fleet daily and get alerted to trouble on your line before you notice it. If your calendar connection ever expires, it's spotted overnight and you get a one-tap link to reconnect. And a billing hiccup never takes your phone down — that's not a lever we'd pull on a business that runs on its calls.
The agent you launch with is the worst it will ever be.
Most voice bots are configured once and quietly decay from the day they go live. Yours is graded on every single call it answers — and when something falls short, we fix it. You don't have to do anything, and it isn't reserved for the top plan.
Every call gets graded
The moment a call ends it's scored against explicit written rules for your agent: did it stay inside your information, did it hand off to a human when it should have, did it confirm the appointment properly. Sixteen to twenty-eight separate checks on a typical call, depending on your industry.
Checked against your own information
"Did the agent make something up?" is judged against your real price list, hours, and policies — not against the agent's own confidence. Every call also records any question it couldn't answer, in the caller's own words, so we can tell what it didn't know from what it correctly declined to say.
We fix it — often for everyone at once
What failed gets reviewed and corrected through the same tested pipeline that built your agent. Many corrections land in the shared foundation your industry's agents are built on, so every business on it improves at the same time — including the smallest plan we sell.
It is not a self-learning bot, deliberately. Your agent never rewrites its own rules — that boundary is exactly why it can be trusted on your line. Every correction is made by a person and reviewed before it reaches your number.
You can see exactly what it did.
The usual answer to "is this thing working?" is a vendor telling you it is. You get a login instead — your own dashboard, showing every call the agent answered and what came of it.
What it was worth
Appointments booked this month, multiplied by what a job is actually worth to you — a number you set, not one we invent. Alongside it: callbacks still owed, calls handled, and how many of those came in after hours or while your line was already busy. The calls you'd have lost.
Every call, searchable
Your whole call history — filter by date, by what happened (booked, transferred, needs follow-up), or search what the call was about. Open any one to read a written summary of what the caller wanted and how it ended. Export the page you're looking at to a spreadsheet.
A callback list you can work
Every caller who needed a callback, with their number, what they asked for, and a summary of the call — and a button to mark them contacted once you've rung back. Nothing to export, nothing to re-key. Your line's own number is on there too, so you can call it and hear what your customers hear.
Sign in with your email — no password to lose. A recap of the month lands in your inbox automatically, and you can switch on a weekly one. It's included on every plan, Solo to Standard.
Books straight into the calendar you already run.
The agent writes confirmed appointments directly into your scheduler — no double entry, no separate system to keep in sync. Direct booking into your own Google Calendar is on every plan, including Solo. Square Appointments is on Starter and Standard; Jobber job requests are on Standard. Don't run any of them? Every plan can book onto a Cal.com calendar we set up for you.
How the LinearZeta app uses your Google Calendar
LinearZeta is the app your business connects to Google — through a standard Google sign-in you grant during onboarding and can revoke at any time. It asks for calendar access for one purpose: so your voice agent can offer callers times you're actually free and put every confirmed appointment on your Google Calendar, where the rest of your day already lives.
That's the whole job. Calendar access is never used for advertising, never sold, and never read beyond what booking requires. Details are in our Privacy Policy.
Don't see your system? Ask us — we're adding scheduling integrations as we grow.
All product names, logos, and brands are property of their respective owners and are used here only to identify the booking systems we integrate with. Use of a logo does not imply endorsement or partnership.
What good looks like.
Figures are illustrative targets for a typical appointment-based business, not a guarantee. We set real baselines and targets with you before launch.
Built for businesses that live on the phone.
We work with appointment-driven service businesses across the United States.
Home Services
HVAC, plumbing, electrical, roofing
Learn more →Salons & Spas
Booking, rescheduling, walk-in questions
Learn more →Fitness & Wellness
Class sign-ups, intro offers, membership questions
Learn more →Legal & Professional
Intake, qualification, routing
Learn more →Real Estate
Showing requests, buyer & seller intake, callback requests
Learn more →Nail Salons
Manis, pedis & fills booked 24/7, walk-in & price-list questions
Learn more →We also run agents for restaurants taking pickup orders by phone, auto shops and detailers booking routine service, used-car dealerships booking test drives and trade appraisals, and independent consultants running intake. Don't see yours? Book a call audit — we'll tell you plainly whether your calls are a fit.
Transparent pricing. No surprises.
No setup fee — just a simple monthly to run, monitor, and improve your agent. See exactly what it costs.
See Pricing →Find out what your phone is costing you.
Book a free call audit. We'll listen to how calls are handled today and show you exactly what a voice agent would catch.
Book a Free Call Audit →