Voice agents that sound human

Build AI agents that answer phones, qualify leads, and book appointments — with sub-second responses and natural interruptions. $10 free credits to start.

Start building free Speech-to-Text API<800ms responses · No card required

Hear a live call

Live call · Ava, an agent voiced by the platform itself

OpenAIAnthropicDeepgramElevenLabsCartesiaTwilioGroqCerebrasOpenAIAnthropicDeepgramElevenLabsCartesiaTwilioGroqCerebras

AGENTS

From prompt to phone call — in three steps.

Katy

Front desk

John

Sales

Sarah

Real estate

Katy

Front desk

John

Sales

PHONE NUMBER

Create your agent

Write a prompt or draw a flow on the visual canvas. Pick a voice, language, and the AI models you want.

Connect a number

Plug in your Twilio number for inbound & outbound calls — or embed web voice straight into your product.

Go live & monitor

Watch transcripts, latency traces, QA scores and per-call costs in real time. Iterate the same day.

<800msvoice-to-voice response

40+AI models behind one API

160+API endpoints

$0.03per minute, billed per second

Ava

One command, a working agent — watch it happen.

InfraVoice · Ava

Interview

Tell Ava what you need

"Create an appointment booking agent." Ava reads it against your workspace and asks only what it can't infer.

Review the plan

Steps, transitions, tools and the values you still owe — one document. Approve it, or say what to change.

Approve — it builds and goes live

Ava writes the flow, attaches tools and knowledge, binds the number. Every change is reviewable, and undo is one click.

Ava canBuild agentsEdit flowsAttach tools from a curlBind numbersStaff a call centerAnswer workspace questions

CALL CENTER

One console for your whole call center

Add AI & human agents

Mix AI and human agents in one roster. AI answers first; people stay on standby.

Watch live conversations

Every word transcribed in real time — follow any call as it happens.

Transfer between call agents and human agents

When a caller needs a person, the AI hands off mid-call with full context.

DTMF keypad support

Callers press keys for menus, PINs and confirmations — the agent reads every tone.

Flag inappropriate content

Abuse, threats and policy breaches are caught mid-call — flagged, redacted and escalated in real time.

Score every call

After hangup, each call is auto-graded on resolution, tone and compliance.

InfraVoice · Call Center

Support Desk · Agents

Support Desk

Agents

+ Add agent

Ava

AI · answers every call first

On call

Kai

AI · overflow & after-hours

Idle

Maria Santos

Human · Tier 2 support

HUMAN

Available

James Okafor

Human · billing

HUMAN

Busy

Everything a voice agent needs

Production-grade pieces, already wired together.

Visual Flow Builder

Design conversations on a canvas — welcome, questions, branching, transfer and end-call.

agent.flow · Draft

## GREETING
Welcome the caller, confirm their name.
## QUALIFY
Ask what they're calling about

Real Phone Calls

Inbound & outbound telephony on your own number, with voicemail detection and human transfer.

InfraVoice Line

+1 (415) 555-0132

InboundOutboundTransfer

Sub-second Turnarounds

A streaming ASR → LLM → TTS pipeline tuned per-millisecond, with latency tracing on every turn.

0:00 / 0:42

ASR 90msLLM 210msTTS 112ms412ms first token

Ava — your AI teammate

NEW

Build, edit, staff and explain — from one chat. Ava plans first, builds on approval, and every change is reviewable.

Create a knowledge base from our FAQ and attach it to Katy

✓Stored FAQ · 12 answers

✓Attached to Katy · Front desk

Waiting for your review · 2 changes

Plan → Approve → LiveUndo anytime

Analytics & QA Scoring

Full transcripts, timing breakdowns and automatic QA scoring across every conversation.

Avg QA score92.4%

MonSun

Pay-as-you-go Wallet

No subscriptions. Top up via Stripe, pay per minute billed by the second — every call itemized.

Call · 2:14$0.07

Call · 0:48$0.02

Call · 5:31$0.17

Today$2.41

$10.00 free credit remaining

<800ms

40+

160+

$0.03

<800ms

Voice-to-voice response

A streaming ASR → LLM → TTS pipeline tuned per-millisecond — callers never wait, and interruptions feel natural.

Simple, usage-based pricing

No subscriptions. No seats. Pay only for the minutes you use — every call itemized, invoices included.

$0.03/ minute, billed per second

✓$10 free credits on signup

✓Web voice + real phone calls

✓All features included — flows, call center, analytics, Ava

✓Bring your own AI provider keys

Claim your $10 free

your next call, answered by AI.

Create an agent and hear it speak in under five minutes — or just ask Ava.

↳Get started — it's free

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