What an AI voice agent costs in the UK, in pounds

If you search for the cost of an AI voice agent you will find a spread from five cents to a dollar and a half a minute, nearly always in US dollars, rarely with the telephone line included and never with VAT. This guide puts the figures in one place, in pounds where we can, and shows the working.

We sell one of the products discussed, so our own prices are stated plainly alongside the others, and every competitor figure is taken from that company's own pricing page on 12 November 2026.

What is inside a per-minute price

An AI phone call has several suppliers behind it, and a quoted rate may include any combination of them.

A page advertising "$0.05 a minute" is often quoting one layer. The same platform's own estimate for a complete call is usually two or three times that.

What the main platforms publish

To convert, at $1.30 to the pound ten cents is a little under 8p. Exchange rates move, which is itself a cost if your supplier bills in dollars.

These products are not like for like. Retell, Vapi and Bland are toolkits a developer assembles into a product. Unibound's rate sits beside a platform fee that covers the flow builder, the shared inbox, team calling and unlimited users. Which is cheaper depends on what you would otherwise have to build, buy or do by hand.

The charges that change the bill

Two quotes with the same per-minute rate can differ by half once these are counted. Ask each supplier:

• How is a minute counted? Per second, or per started minute? A 61-second call is one minute on the first and two on the second. Unibound bills per started minute.
• Do unanswered calls cost anything? In outbound work most dials are not answered. Paying even a few pence for each adds up fast.
• What does a voicemail cost? And does the agent leave a message or hang up?
• What happens on a transfer? Some platforms keep charging the AI rate while your person talks.
• Is there a monthly minimum or an annual commitment?
• How many calls at once? Extra concurrent lines are often a separate charge.
• What about texts and WhatsApp? A follow-up message after a missed call is usually where the booking happens.
• Who builds and maintains it? Developer time is the largest cost on the toolkit platforms, and it never appears on the pricing page.

Worked examples in pounds

These use Unibound's published rates, because we can vouch for them: 1 credit is 1p, an AI call is 16 credits a started minute, a UK text is 7 credits, a voicemail is 3, and an unanswered call is free.

A month of new enquiries

Suppose 500 enquiries a month. Each gets a call within seconds. Say 300 answer and talk for three minutes on average, and the other 200 get a text.

• 300 calls × 48p = £144
• 200 texts × 7p = £14
• Usage: £158. Platform fee: £500. Total: £658 before VAT.

That is about £1.32 per enquiry contacted. The usage part is small; the platform fee is most of it at this volume, and it spreads thinner as volume grows. You can try your own numbers in the estimator on our pricing page.

Compared with a person

Per minute, the comparison is closer than the marketing suggests. Someone paid £13 an hour costs about 22p for each minute they are paid, before employer costs, holidays and management, and no one is on a call for every paid minute. An AI call at 8p to 16p a minute is cheaper, but not by an order of magnitude.

The real differences are elsewhere:

• You only pay for the minutes used. No cost while the phone isn't ringing, and none for the 200 dials that go unanswered.
• It is there at 9pm and on Sunday, when small teams are least able to pick up.
• It calls in seconds, which matters more than cost. See what the research says about speed to lead.

And people are better at the calls that decide things. The sensible sum is cost per result: what does it cost to produce one booked appointment, one accepted quote, one resolved query, with AI doing the first contact and a person doing the close?

How to compare two quotes

1. Write down your real volumes: calls placed, share answered, average length, messages sent.
2. Price a month on each supplier, including every layer and the monthly fee.
3. Add the cost of building and maintaining it, if that falls to you.
4. Divide by results, not minutes.
5. Run a small pilot before committing to a year. We offer a free one, and report conversion and cost against your goal at the end.

For what the money buys technically, see how AI phone calls work and voice AI models compared.

Questions people ask

Sources

1. Retell AI, pricing (read 12 November 2026). retellai.com
2. Vapi, pricing (read 12 November 2026). vapi.ai
3. Bland AI, pricing (read 12 November 2026). bland.ai
4. Synthflow, pricing (read 12 November 2026). synthflow.ai
5. ElevenLabs, API pricing (read 12 November 2026). elevenlabs.io
6. PolyAI, pricing (read 12 November 2026). poly.ai
7. OpenAI, API pricing. developers.openai.com
8. Unibound, pricing. unibound.ai