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Done-for-you receptionist or build-your-own agent?
One sells you the parts to assemble a voice agent. The other hands you a receptionist built from your website, answering your line and booking into your Google Calendar.
No card · No setup · Keep your number · No website? Start here
What's the difference between an AI receptionist and a voice-agent platform?
A voice-agent platform sells you the parts: you write the instructions, connect a calendar, buy a number and keep it all running. An AI receptionist is the finished thing. Heyline reads your website, builds her in about a minute, and answers your line — nothing to assemble.
Three names come up: Vapi, Bland and Synthflow. Each is sold as developer infrastructure, and each says so plainly — Vapi's entry tier is named Build, Bland groups its plans for developers, teams and high volume, and Synthflow scopes every package with its sales team. Prices checked September 2, 2026 on each vendor's own pricing page.
None of that is a criticism. If you are building a product for other people to use, that is exactly what you want to buy. If you run a two-person shop and want the phone answered on the next ring, you want the finished thing.
A platform hands you a voice, a phone leg and the tools, and expects you to keep them together. A receptionist arrives assembled, knowing your services and hours, and able to book.
What do they charge, and what do you get?
Each figure below is quoted from the vendor's own pricing page and stamped with the day it was read. Where a vendor publishes no rate, the cell says so rather than guessing. Platform pricing moves, so the date matters.
| Product | What you're buying | Published price | Real-time calendar booking |
|---|---|---|---|
| Vapi | Developer platform, usage-based | $0.05/min Vapi hosting, $0 platform fee on Build; the AI providers behind the call are billed on top at cost ($0 if you bring your own API key)source, checked | Google Calendar tools documented for any plan — yours to build, host and keep runningVapi docs define google.calendar.availability.check and google.calendar.event.create with no plan restriction (read September 2, 2026).source, checked |
| Bland | Developer platform, pay-as-you-go | $0.14/min talk time, no platform fee on their Start plansource, checked | Appointment Scheduling Node listed only on Enterprisesource, checked |
| Synthflow | Sales-led enterprise contract | From $30,000 a year; no per-minute rate published on their sitesource, checked | Booking exists, but the named calendars are Cal.com and GoHighLevel, not Google Calendar; scoped inside the contractsource, checked |
| Heyline | Done-for-you AI receptionist | $99/mo Starter, 200 minutes included | Included on Starter, Growth and Scale |
Prices in USD. Heyline's row comes from our own pricing page, where the minutes and what happens when you run out are spelled out in full.
Decide with your ears — not a sales deck.
Paste your website and talk to your own receptionist, free, in your browser.
Do I need a developer for any of this?
For the platforms, yes. Their documentation is written for a developer, and their plans are priced by call volume and daily caps rather than by what a front desk needs. A determined owner can learn it; the question is whether that is the job you want.
For Heyline, no. The setup is a website address and a listen. When she sounds right, you pick a plan, she gets a dedicated number, and you forward the calls you can't get to — one code from your carrier.
Editing stays in plain language too. Services, hours, the facts she tells callers, her voice and the words she must never say all live in the notes she works from, written the way you'd explain them to a new hire.
Owning it is the quiet cost. A price changes, a service gets added, a technician leaves — on a platform, each of those is a change somebody has to make and then test on a real call. Here you open her notes, type the new answer, and she uses it on the next ring.
What each of them does well
A fair word about all three, taken from their own pages. Two will even hand you a microphone before you sign up: Vapi's homepage carries a browser voice widget, and Bland's has a talk-to-an-agent section with fixed personas to pick from.
Vapi
Vapi is honest about what it sells. The entry tier is called Build, the homepage leads with an API-first pitch, and the pricing page says the providers behind a call are passed through at cost. New accounts get starting credits with no card.
Bland
Bland publishes one all-in rate that folds the talking, the listening and the phone line into a single number, and says there are no provider charges stacked on top. That is easier to forecast, and their plans are segmented by who is buying rather than by feature drip.
Synthflow
Synthflow sells the whole engagement rather than the parts: implementation, onboarding, testing, training and launch support are scoped with their team, alongside telephony and the security review a larger buyer will ask for. If you want an account team, that is a real offer.
Which one is right for your shop?
A quick way to place yourself.
- You are building a product other people will use. Take a platform. You want the control and the API.
- You already have a developer, or you are one. A platform is a reasonable buy, if someone owns it after launch.
- You want one line answered well this week. A done-for-you receptionist is the shorter road: nothing to assemble, nothing to host.
- You want to judge it with your ears. As of September 2, 2026, none of Vapi, Bland or Synthflow builds an agent from your website URL, so none lets a prospect talk to their own agent in the browser before signing up — Vapi and Bland offer a browser demo of their own generic agent; Synthflow offers none. Paste your website here and hear yours.
- You run more than one business. Growth covers up to three, Scale up to five, each with its own receptionist and number.
- You want a short setup. She is built from your website in about sixty seconds; going live is a plan, a card and one forwarding code.
What she never does, even where a platform would
She never transfers a call to you. There is no warm handoff and no ringing your cell mid-call. When she can't help, she takes a name and a number and opens a call-back on your to-do list.
She never texts anyone. No confirmations, no reminders, no missed-call texts, and no calls out. The recap lands in your email after every call instead.
She never speaks anything but English, and she works in the United States and Canada only. One language, no exceptions.
She never connects to anything but Google Calendar. No customer database, no field-service software, no second calendar. One connection is the whole list — and it is on every plan, not the middle one.
She never invents a price. She answers pricing questions from your price sheet, and where your notes are silent she offers a free estimate and takes the caller's details rather than guessing at a number.
Frequently asked questions
What is a voice-agent platform?
It is developer infrastructure for building phone agents: you write the instructions, choose the voices, connect a calendar, buy a number and keep the whole thing running. Vapi, Bland and Synthflow are the names that come up most. They sell by the minute or by contract, and what arrives is parts, not a finished receptionist.
Do I need a developer to run a voice agent on one of these platforms?
Their documentation is written for one, and their pricing pages are organized around how many calls can run at once, daily call caps and per-minute rates. A determined owner can learn it. The part people underestimate is afterwards: someone owns the instructions, the number, the calendar connection and every change you want six months from now.
Do I need a developer for Heyline?
No. You paste your website address, she reads your services, hours and service area, and about a minute later you are talking to her in your browser — no account, no card, no phone number yet. Editing is plain language: services, hours, her voice, the words she must never say. Going live is a plan and call forwarding.
Is Heyline built on a voice-agent platform?
Heyline runs on managed voice infrastructure, the same way your website runs on somebody's servers. You never see it, never sign up for it, never pay it separately and never maintain it. What you buy is the receptionist: built from your website, answering your line, booking into your Google Calendar and emailing you the recap.
You wanted a receptionist, not a project.
Give us your website address and a minute of your time. Then judge her with your ears instead of a comparison table.
No card · No setup · Keep your number · No website? Start here
Keep reading
Sources
- Prices checked September 2, 2026 on each vendor's own pricing page.
- Vapi pricing — hosting rate and pass-through provider costs (read September 2, 2026)
- Vapi homepage — API-first positioning and the browser voice demo (read September 2, 2026)
- Bland pricing — per-minute rates and the plan comparison matrix (read September 2, 2026)
- Bland homepage — the talk-to-an-agent browser demo (read September 2, 2026)
- Synthflow pricing — enterprise contract pricing (read September 2, 2026)
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