AI voice agent development for every call

Custom AI voice agents that answer and make your calls, book appointments, qualify leads and pass the rest to your team.

Voice agents and speech AI we build

The voice agents we build most often, the speech AI around them, and any other call your team takes.

  1. 01 / 10

    Customer support lines

    Calls answered at any hour: questions settled from your own help content, orders and accounts looked up, and the rest passed to your team with notes.

    • Questions answered from your help content
    • Orders, deliveries and accounts looked up mid-call
    • Answered at any hour, in the caller's language
    • Passed to your team with a call summary
  2. 02 / 10

    Reception and booking

    Appointments booked, moved and cancelled in your calendar, with a text to confirm.

    • Appointments booked, moved and cancelled
    • Your calendar checked live for free slots
    • A text sent to confirm each booking
    • Opening hours, prices and directions answered
  3. 03 / 10

    Phone menus replaced

    Callers say what they need instead of pressing numbers, and reach the answer or the right person.

    • Callers say what they need, no keypad
    • Routed to the answer or the right team
    • Simple requests settled without a transfer
    • On the phone numbers you already have
  4. 04 / 10

    Sales: qualify and book

    New leads called back within a minute, qualified against your criteria and booked into a rep's calendar, with the notes in your CRM.

    • New leads called back within a minute
    • Qualified against your criteria
    • Meetings booked in a rep's calendar
    • Notes and outcome logged in your CRM
  5. 05 / 10

    Reminders and follow-ups

    Outbound calls that confirm appointments, chase renewals and follow up on quotes, within consent and calling rules.

    • Appointment confirmations and reminders
    • Renewals chased and quotes followed up
    • Calls within consent and calling-hour rules
    • Each call logged: confirmed, moved or no answer
  6. 06 / 10

    Voice in your app, site or device

    A talk button in your app, on your website or on a device, like a kiosk or a car, that answers from your data and does the task.

    • A talk button in your app or on your site
    • Answers from your product's own data
    • Tasks done by voice, like placing an order
    • On the web, mobile, kiosks and devices
  7. 07 / 10

    Transcription and call notes

    Calls, meetings and consultations turned into searchable transcripts and notes, with who said what and the actions agreed.

    • Speech to text for calls, meetings and recordings
    • Speakers told apart, with timestamps
    • Summaries and actions written into your systems
    • Clinical and legal notes in your own templates
  8. 08 / 10

    Call analytics and quality review

    Every call transcribed and scored for outcome, sentiment and script, so your team reviews the calls that need it.

    • Every call scored, not a sample
    • Sentiment, outcome and reasons for calling
    • Script and compliance checks
    • Trends and coaching notes for your team
  9. 09 / 10

    Real-time translation

    Speech translated as it's spoken, for calls, meetings and live events, as captions or a translated voice.

    • Two people talking across languages, live
    • Captions or a translated voice
    • Meetings and live events translated as they run
    • Glossaries that keep your product terms right
  10. 10 / 10

    Text to speech and brand voices

    Your text read aloud in a natural voice, or a voice of your own, for phone lines, apps, videos and accessibility.

    • Natural voices in many languages
    • A custom brand voice, made with consent
    • Phone prompts, voiceovers and read-aloud
    • Your names and terms pronounced right

Our AI voice agent development process

Six steps, from the calls you want handled to an agent your callers talk to every day.

  1. 01Scope

    The calls worth automating, how each should end, and when a person takes over.

  2. 02Plan

    The script, the voice and the turn-taking agreed as sample calls you can listen to, with a dated estimate.

  3. 03Build

    Telephony, speech, your calendar and your CRM connected in one pipeline.

  4. 04Test

    Hundreds of simulated calls with accents, noise and interruptions, and the latency checked.

  5. 05Launch

    Live on a share of your calls first, then on all of them once the numbers hold.

  6. 06Maintain

    Calls reviewed every week, with prompts and flows tuned from what went wrong.

AI voice agent features

What we can build into a voice agent, chosen for the calls it takes.

  • Sub-second replies

    Speech recognised as it's spoken, and the answer started before the caller hears a pause.

  • Natural interruptions

    Interrupted, it stops, listens and picks up from there, as a person would.

  • Handoff with notes

    Calls pass to your team with a summary, so nobody asks the caller to start again.

  • Calendar and CRM

    It books, looks up and updates records during the call, each tool with its own permissions.

  • Your phone numbers

    Calls answered on the numbers you already have, through your phone system or a SIP trunk.

  • Transcripts and call review

    Every call transcribed and summarised, with outcomes to review week by week.

  • Languages and voice

    It answers in the caller's language, in a voice chosen for your brand.

  • Tested on simulated calls

    Simulated calls with accents, noise and interruptions run against every change.

  • Consent and data protection

    Recording consent asked where the law requires it, and card numbers kept out of transcripts.

Ways to start

Starting something new with AI, or adding it to software you already have.

Something new

  • Build a first version

    An AI MVP with the features that matter most, to launch and learn.

  • Build the whole product

    An AI product designed, built and launched in full, by one team.

  • Extend your team

    AI engineers join your team, or a dedicated team runs the work.

Software you already have

Industries we build software for

Custom software development across industries: web, mobile and AI applications, built and security-audited by one team.

  • A modern hospital patient room in the evening, a made bed beside a patient monitor and an IV stand

    Healthcare & MedTech

    Healthcare and medical software development: patient portals, telemedicine apps, EHR integrations and clinical dashboards.

  • A phone showing a mobile banking app beside a black metal payment card on a stone table

    Fintech & Payments

    Fintech and payment app development: digital wallets, payment gateways, mobile banking apps and lending platforms.

  • A streetwear store with a wall of hoodies and jerseys, a lit sneaker wall and a terrazzo display of tees and caps

    Retail & Ecommerce

    Ecommerce development for online stores, mobile shopping apps, point-of-sale software and inventory management.

  • A brass luggage trolley with suitcases and a coat in a modern hotel lobby, beside the reception desk

    Travel & Hospitality

    Travel and hospitality software: booking engines, hotel management systems, travel apps and supplier integrations.

  • A robotic assembly line in a smart factory, with robot arms in glass cells and autonomous robots carrying parts

    AI & Automation

    AI development and AI automation: AI agents, chatbots, document processing and automated business workflows.

  • A software team's studio with a product roadmap of sticky notes on a whiteboard above a shared desk

    SaaS & Marketplaces

    SaaS and marketplace development: multi-tenant platforms, subscription billing, user roles and vendor payouts.

  • Parcels on a conveyor in a fulfilment warehouse, with tall pallet racking and a forklift behind

    Logistics & Supply Chain

    Logistics and supply chain software: fleet and warehouse management, route planning and shipment tracking.

  • A university library atrium with study tables, glass study rooms and a recording room beneath tiers of bookshelves

    Education & EdTech

    EdTech and education app development: learning management systems, e-learning platforms, virtual classrooms and assessments.

  • A secured glass door with a fingerprint reader beside a long data centre aisle of server racks

    Cybersecurity

    Cybersecurity software: identity and access management, SIEM dashboards and compliance tooling, plus security audits and penetration testing.

  • A newly built apartment's living room and kitchen at dusk, floor-to-ceiling windows onto residential towers and a tower crane

    Real Estate & PropTech

    Real estate and PropTech software development: property management systems, listing portals, agent CRMs and tenant apps.

  • A law firm's double-height library at dusk, a long walnut meeting table laid with a contract, a fountain pen and case binders

    Legal & LegalTech

    Legal software development: case and contract management, legal document management and eDiscovery tools.

  • An esports arena before a final, a fantasy battle map on the giant screen above two lit team desks and a silver cup on a plinth

    Gaming & Esports

    Gaming and esports software: game backends, multiplayer matchmaking, tournament platforms, player accounts and in-game payments.

We also build software for insurance (insurtech), government (govtech), energy and media. If your industry is not listed, we can still build for it.

Software we run in production

Three products of our own, designed, built and kept running by the team that would build your voice agent.

  • Retail · SaaS

    A point-of-sale system that keeps sales, stock and receipts together on till, tablet and phone.

    Screen capture, 1908 × 944
  • Travel

    A travel booking app whose AI assistant finds flights, hotels and trip ideas, through to a confirmed booking.

  • AI

    Silvia AI

    An AI assistant for customer support and sales that answers questions and guides buyers.

    Screen capture, 1908 × 944

Questions about voice agents

What teams ask before they let an AI answer their phones, answered plainly.

Ask your own
Which calls should a voice agent take?

Calls that repeat and have a clear finish: booking and rescheduling, order status, first-line support, qualifying a lead. Calls with high stakes or strong feelings are better with a person from the start, and we'll say which of yours are which.

How is it different from a phone menu?

A phone menu makes callers press numbers through fixed options. A voice agent understands what the caller says, asks a follow-up when it needs one, and does the task — books, looks up, updates — or passes the call to the right person.

Will it work with our phone system, calendar and CRM?

Usually, yes. It connects to your phone numbers or SIP line, and to your calendar, CRM, help desk and order system through their APIs, each with only the permissions it needs. In an app or on a website it runs behind a talk button instead of a number.

Will callers know they're talking to an AI?

They should, and we set it up that way: the agent says so at the start, wherever the law requires it and wherever you prefer. A natural voice and quick replies keep the call easy, and a person is always one request away.

What happens when it can't help?

It says so and transfers the call to your team with a summary of what was said and done, so the caller doesn't repeat themselves. Out of hours, it takes a message or books a callback.

Which languages can it speak?

Most of the languages your callers use, English, Spanish and Portuguese among them, switching when the caller does. Voices and pronunciation are tested in each language before launch.

How fast does it reply?

Fast enough for a phone call: usually under a second from the end of the caller's sentence. Speech is recognised while it's spoken, and the agent stops talking when the caller interrupts.

Does it follow recording and consent rules?

We set recording notices and consent for each country, keep card numbers and other sensitive details out of transcripts, and keep audio and transcripts in the region you choose. Outbound calls follow the calling rules where they're made, such as PECR in the UK.

Do you build on Vapi or Retell, or from scratch?

Either. Vapi and Retell get a standard call flow live quickly; LiveKit or Pipecat on your own infrastructure give full control over the models, the speech, the speed and the data. We recommend one after looking at your calls, and the agent stays yours either way.

How long does it take, and what does it cost?

Choosing the calls and designing the conversation takes one to two weeks, a working agent on simulated calls two to six, and a pilot on real calls a few weeks more. Running cost is per minute of calls — speech, voice and model — which we estimate before we build. After a first call we send a written estimate.

Describe your project. Get an estimate.