About
Two people,
and a phone
that never stops.
OnCallAI Pro is an AI receptionist company in San Antonio, Texas. We build phone agents that answer a small business's line 24 hours a day in English and Spanish, book jobs into the owner's real calendar, and text them what was said. Darwin Lechler and Tomas Gomez founded the company in 2025.
We started it after watching the same thing happen in shop after shop.
The phone rings while both hands are busy. It rings at seven at night. It rings on a Saturday afternoon. Nobody picks up, and the customer scrolls down one line and calls the next name, and that one answers.
Every owner we talked to already knew it was happening. None of them could fix it by hiring, because a front desk costs three to four thousand dollars a month and goes home at five. The call that matters most is usually the one that comes in after they've left.
Who we work with
Businesses that live and die by the phone.
Auto repair shops, property managers, salons and barbershops, med spas, dental offices, HVAC and plumbing companies, roofers, pool services and law firms. The trade changes and the problem doesn't.
We also design and build websites, because a receptionist with nothing pointing at her is a phone that never rings, and a site that brings in calls nobody picks up is an expensive brochure. They're one job, and most shops buy them from two people who never speak to each other.
Where we work
San Antonio, and out to the border.
- San Antonio
- New Braunfels
- Seguin
- Boerne
- Schertz
- Helotes
- Uvalde
- Del Rio
- Eagle Pass
- Laredo
The rules
What she will never do.
Invent a price
What she's allowed to quote is what you told us she can quote. Everything else becomes a free estimate and a call back from you.
Pretend to be a person
If a caller asks what she is, she tells them. We've never had that lose a booking, and we've seen the opposite lose trust.
Hold your number
It's your number, your calendar and your customer list. If you leave, they leave with you. Nothing here is rented back to you.
Who you'd be dealing with
Two people, and you get both of them.
Darwin Lechler builds the receptionists and runs the client work. If you call the demo line, book a call, or text us because your prices changed, that is him. Tomas Gomez handles the technical side of the platform the agents run on.
That is the whole company. It is worth knowing before you buy, because it cuts both ways: you are not getting a support tier, a ticket queue or an account manager who has never heard your business explained. You are getting the person who built the thing.
It also means we say no. If your call volume does not justify this we will tell you on the first call rather than selling you a plan you will cancel in March.
How we actually work
Built around one business at a time.
Every receptionist is built from scratch around one business: its hours, its services, the prices it is willing to quote, who gets transferred and what a caller hears. We do not hand you a dashboard and a template.
Then you test it for a week. You call your own receptionist as a customer, try to break it, and tell us what is wrong. It goes live when you say so, on the number you already have — never on a schedule we set.
After that we sit down with you every two weeks and go through the real calls together. That is the part nobody expects and the part that makes the difference, because a receptionist is only ever as good as how current it is.
- Built for you, on every plan, including the $89 one
- You test it for a week before it touches your real line
- You keep your existing number
- Changes are a text message, never a change order
- A tune-up call every two weeks, on your real calls
- No contract — month to month, and no overage rate
Fair questions
Things people ask before they trust us.
How big is OnCallAI Pro?
Two people, in San Antonio. We are not going to dress that up — you would find out on the first call anyway.
What it means in practice: no support tier, no ticket queue, and the person who built your receptionist is the person who answers when you text about it.
How long have you been doing this?
The company was founded in 2025 and this is what we do full time. We are newer than the national answering services, and cheaper, and you get the founders rather than a queue.
If you would rather buy from a large company with a long track record, that is a completely reasonable decision and we would point you at one.
How do I judge this before I buy it?
Call the demo line. 210-794-7310, any hour, and ask it whatever one of your customers would ask. Thirty seconds on the phone tells you more than any page we could write.
We don't put a client's name on our site without asking them first, so you won't find a wall of logos here. The phone is the proof, and it's a better test anyway.
What happens if you disappear?
You keep your number — it was always yours and it stays pointed wherever you tell your carrier to point it. Unforwarding it takes a phone call to them.
There is no contract holding you, and if we build you a website you own that and the domain outright. Nothing we do leaves you unable to walk away.
The next call is already on its way.
Half an hour is enough to know whether she'd work for you.
Not ready for either? Leave us a note instead.