Voice AI platform for businesses
Your phone calls,
answered by AI
AI agents that pick up the phone, have real conversations, and handle everything from bookings to transfers. From $0.08/min.
$10 free credit·No card required
<500ms
Response time
$0.08/min
All inclusive
30+
Languages
99.9%
Uptime SLA
TRUSTED ACROSS INDUSTRIES
Healthcare
Restaurants
Real Estate
Dental Clinics
Hotels
Marketing Agencies
Law Firms
E-commerce
SaaS Companies
Healthcare
Restaurants
Real Estate
Dental Clinics
Hotels
Marketing Agencies
Law Firms
E-commerce
SaaS Companies
HOW IT WORKS
Five steps. Four hundred milliseconds.
What happens between the question and the answer.
01
Caller speaks
Voice streams in
02
Transcribed
Voice to text
03
AI thinks
Reads + replies
04
Voice made
Text to speech
05
Caller hears
Natural reply
<500ms
Total response time. Faster than most humans.
Live demo
Hear the AI speak
Pick a voice. Pick a scenario. Listen to a real AI call.
CHOOSE A VOICE
🇬🇧
Sophie
🇬🇧
James
🇬🇧
Oliver
🇺🇸
Rachel
🇺🇸
Michael
🇺🇸
Emily
🇦🇪
Aisha
🇸🇦
Omar
🇦🇪
Fatima
🇫🇷
Marie
🇪🇸
Maria
🇮🇹
Luca
CHOOSE A SCENARIO
Reception & enquiries
Greet callers, answer FAQs, take messages
Appointment booking
Check availability, book slots, send confirmation
Warm transfer to human
AI introduces the caller before handing over
Cold transfer to human
Instant transfer to the right department
After-hours handling
Take messages when the office is closed
Restaurant reservation
Table bookings, menu questions, opening hours
Dental & healthcare
Patient appointments, insurance queries, reminders
Real estate enquiry
Property details, book viewings, qualify buyers
Hotel concierge
Room bookings, room service, local tips
E-commerce support
Order status, returns, delivery updates
Lead qualification
Call leads, ask questions, score and route to sales
Appointment reminder
Confirm upcoming bookings, reschedule if needed
Feedback & survey
Post-service follow up, collect ratings
Payment reminder
Overdue invoice follow-up, payment confirmation
Supports 30+ languages and accents
No signup required · Instant playback · Real AI, not recorded
FOR DEVELOPERS
One API call.
Your number answers.
Your number answers.
Create a voice agent on any phone number. That's it. Everything else is in the docs.
const agent = await nxf.create({
name: 'Reception',
prompt: 'You are a friendly...',
voice: 'sophie',
language: 'en-GB',
phone: '+447911123456',
webhook: 'https://you.com/calls'
})
// Calls are now answered by AI.
// POST to your webhook after each call
{
"call_id": "nxf_8f2a...",
"duration": "2:34",
"sentiment": "positive",
"summary": "Booked table for 4...",
"transcript": "[full text]",
"recording_url": "https://..."
}
const call = await nxf.call({
agent: 'agent_id',
to: '+447700900000',
context: 'Remind about appointment'
})
// AI calls the number and handles
// the conversation automatically.
$npm install nixflexcopy
INTEGRATIONS
Every call sends data everywhere
After every call, transcripts, recordings, and insights flow automatically to your tools.
Full text
Transcript
Audio file
Recording
AI written
Summary
Caller mood
Sentiment
Key info
Extracted data
CONNECTS TO YOUR TOOLS
Via webhooks and Zapier — connects to 7,000+ apps automatically
No code needed. Data flows after every call.
PRICING
Half the price. Same quality.
Other platforms charge $0.15-0.25/min after hidden costs. We charge $0.08. Everything included.
INDUSTRY AVERAGE
$0.17
per minute (real cost)
NIXFLEX
$0.08
per minute, fixed
Save 53%
Transcription
Real-time, 30+ languages
AI reasoning
Under 500ms response
Natural voice
Human-quality speech
Call analysis
Summary, sentiment, data
Recording + transcripts
Stored securely
Call transfer
Warm and cold
SMS
Via your own Twilio
Unlimited agents
No per-agent fees
Webhooks
Post-call data delivery
$10 free credit·~125 minutes free
No monthly feeNo card requiredPay only for what you use
FAQ
Questions
& answers
& answers
What is Nixflex?
+
Nixflex is a voice AI platform that answers your business phone calls automatically. When someone calls your number, our AI picks up, has a natural conversation, handles bookings, answers questions, transfers calls, and sends you all the data afterwards.
How does the AI sound so human?
+
We use the latest neural text-to-speech technology with over 30 natural voices across multiple languages and accents. The AI responds in under 500ms — faster than most humans — so conversations feel natural and fluid, not robotic.
What languages are supported?
+
We support 30+ languages including English (UK, US, Australian), Arabic, French, Spanish, German, Italian, Portuguese, Dutch, Polish, Turkish, Hindi, and many more. Each language has multiple voice options with regional accents.
Can the AI transfer to a human?
+
Yes. The AI supports both warm transfers (AI introduces the caller and provides context before handing over) and cold transfers (instant redirect to the right department). You define the rules for when and how transfers happen.
How long does setup take?
+
Under 5 minutes. Create an account, set up your AI agent with a system prompt, connect your Twilio phone number, and calls are answered immediately. Developers can do it in 5 lines of code.
Can I try it before I pay?
+
Yes. Every new account gets $10 free credit — roughly 125 minutes of calls. No credit card required to sign up. You can test with real calls and only add a payment method when you're ready.
How is Nixflex different from competitors?
+
Three things: price, speed, and simplicity. At $0.08/min all-inclusive, we're roughly 53% cheaper than alternatives. Our response latency is under 500ms. And setup takes minutes, not days.
Can the AI handle accents and background noise?
+
Yes. Our speech recognition engine handles diverse accents and background noise well. It accurately transcribes callers with regional accents, non-native speakers, and people calling from noisy environments.
What's the response latency?
+
Under 500ms end-to-end — from the moment the caller finishes speaking to when they hear the AI reply. Faster than most competing platforms (600-800ms) and faster than average human response time (~1.2s).
Can it handle multiple calls at once?
+
Yes. The engine supports 50+ concurrent calls with no degradation in quality or latency. Each call runs independently. No queuing, no hold music, no missed calls.
Do I need my own Twilio account?
+
Yes — you bring your own Twilio phone number. This means you keep full ownership and control. If you ever leave Nixflex, your number stays with you. Twilio setup takes about 2 minutes.
What data do I get after each call?
+
Full transcript, audio recording with shareable URL, AI-written summary, caller sentiment, extracted data (name, email, intent), and call outcome. All delivered to your webhook automatically.
Can the AI send SMS during a call?
+
Yes. The AI can send SMS during the call (booking confirmations, links) and after the call (summaries, follow-ups). SMS is sent via your own Twilio account — no extra setup needed.
Can I use my own AI model?
+
We use optimised AI models by default for the best balance of speed and quality. Custom LLM support (bring your own key) is on our roadmap. Contact us if this is a priority for your use case.
Does the AI handle interruptions?
+
Yes. Barge-in detection stops the AI mid-sentence when the caller starts talking, just like a real human conversation. No talking over each other.
Can I make outbound calls?
+
Yes. Trigger outbound calls via API — the AI calls the number and handles the conversation automatically. Use it for appointment reminders, lead qualification, payment follow-ups, and more.
What if the AI doesn't understand?
+
The AI has fallback responses — it politely asks the caller to repeat or rephrase. If it still can't help, it can transfer to a human, take a message, or offer to call back. You define these rules.
How is billing calculated?
+
Billed per second at $0.08/min. No rounding up — a 45-second call costs $0.06. No monthly fees, no hidden costs, no per-agent charges. Everything included.
Is there a free tier?
+
Every new account gets $10 free credit — roughly 125 minutes. No credit card required. You only add a payment method when your free credit runs out.
How does $0.08/min compare to others?
+
Most platforms charge $0.15-0.25/min when you add up hidden costs (STT, LLM, TTS fees). Our $0.08/min is all-inclusive. That's roughly 53% cheaper than the industry average.
Are there volume discounts?
+
Not yet — we currently offer pay-as-you-go at $0.08/min. Volume pricing plans are coming soon. Contact us if you have high-volume requirements.
Are there any hidden fees?
+
No. $0.08/min covers everything. The only separate cost is your Twilio phone number, which you pay directly to Twilio (typically $1-2/month).
Can I cancel anytime?
+
Yes. No contracts on pay-as-you-go. Stop using it whenever you want — you're only charged for calls already made. Starter and Scale plans cancel at end of billing cycle.
Is my data GDPR compliant?
+
Yes. All data processed and stored in EU data centres. We follow GDPR requirements for handling, retention, and deletion. Configure retention policies from your dashboard.
Where are recordings stored?
+
Stored securely with encryption at rest in EU-based infrastructure. Each recording gets a unique shareable URL. You control retention through dashboard settings.
Who can access my call data?
+
Only you and your authorised team members. All access authenticated with your API key. We never share, sell, or use your call data for training. Your data is yours.
Are calls encrypted?
+
Yes. Audio streams encrypted in transit using WSS and HTTPS. Stored recordings and transcripts encrypted at rest. API calls use TLS. Protected at every stage.
Can I delete my data?
+
Yes. Delete individual recordings, transcripts, and agent data from the dashboard anytime. Full account deletion removes all data permanently. We honour all GDPR deletion requests.
Still have a question?
Contact us →Stop missing calls.
Start answering them.
<500mslatency
$0.08/min
30+languages
50+concurrent
$10 free credit·No card required·Live in 5 minutes
No monthly feeCancel anytimePay only for what you use