Our story
Built by founders, not committees.
Pyrexa is the phone operating system for small business. Every call answered. Every message replied. Every customer engaged.
The Problem
Every missed call is a missed relationship.
Small businesses are the backbone of the economy, but they lose thousands every month to calls that go to voicemail. Most callers hang up and call a competitor.
47%
of small business calls go unanswered
Source: Phonely
62%
of callers never call back after one miss
Source: Ringover
$126K
lost per year from missed calls alone
Source: Dialzara
Our Journey
Built with intention.
2025
Founded
Ruben Zack starts PYREXA with a single thesis: every small business deserves a world-class phone experience.
2025
First voice agent ships
Pyrexa AI, our first AI receptionist, goes live. Sub-100ms response time. Callers can't tell she's AI.
2025
30+ verticals served
From dental offices to HVAC companies, PYREXA adapts to any business vertical in 60 seconds.
2026
Thousands of businesses
Expanding across industries. Every call answered. Every message replied. Every customer engaged.
The Stack
Engineered for human-grade conversation.
We built PYREXA from the ground up with the best AI infrastructure available. No shortcuts.
Neural voice
Sub-100ms neural voice synthesis. Natural cadence, breathing, and intonation that callers can't distinguish from a human.
Proprietary neural codec for natural speech with sub-100ms first-byte latency.
AI reasoning
Advanced reasoning engine that understands context, handles complex scheduling, and learns your business inside and out.
Frontier-class reasoning handles nuanced conversation, appointment logic, business-specific Q&A, and multi-turn dialogue.
Telephony network
Enterprise-grade telephony infrastructure. 99.9% uptime across voice, SMS, and messaging channels.
Carrier-grade SIP trunking, automatic failover, global PoPs, and certified HIPAA-compliant infrastructure.
Real-Time Pipeline
End-to-end latency under 400ms. Conversations flow naturally with no awkward pauses or delays.
WebSocket streaming, chunked audio processing, and speculative execution for zero-lag dialogue turns.
Our Values
What we stand for.
Reliability
Every call answered, 24/7/365. No sick days, no hold times, no missed opportunities.
Human quality
Our AI sounds so natural that callers engage just like they would with your best receptionist.
Privacy first
HIPAA compliant. SOC 2 ready. End-to-end encryption. Your data stays yours.
Radical simplicity
60 seconds to set up. No training manuals, no IT department, no complexity.
Transparency
Every call transcribed. Every interaction logged. Full visibility into what your AI is doing.
Continuous learning
PYREXA improves with every conversation, adapting to your business and your customers.
Trust & Security
Enterprise security, startup speed.
We built security into every layer from day one. Your data, your customers, and your reputation are protected by the same standards used by Fortune 500 companies.
SOC 2 Type II
Readiness in progress
HIPAA-ready
BAA available on Growth+
GDPR Ready
Data privacy by design
99.9% Uptime
Enterprise SLA on annual plans
End-to-End Encryption
AES-256 at rest and in transit
PCI DSS
Secure payment processing
The Team
AI-first, human-centered.
Founder & CEO
Ruben Zack
Bootstrapped PYREXA in 2025 with a clear mission: give every small business the same communication quality as the biggest companies in the world. No VC gatekeeping, no bloated teams. Just relentless focus on the product.
30+
Verticals
60s
Setup time
24/7
Availability
We are raising the round
that puts an AI receptionist in every American business.
33 million small businesses lose calls every day. Pyrexa is the first voice-AI infrastructure platform built for them, sub-100 ms latency, 60-second onboarding, pay-as-you-go pricing. We are bringing in lead investors who believe the next billion-dollar SaaS category sounds human.
<100ms
Voice latency floor
99.9%
Production uptime target
7
Channels handled per agent
60s
Onboarding to live agent
Infra-grade, not toy-grade
We do not bolt prompts onto an AI SDK. Pyrexa runs a custom neural-voice + reasoning + telephony pipeline with sub-100 ms first-byte latency in production today.
Pay-as-you-go from day one
No seats, no minimums, no contracts. Small business pays small. Big business pays affordable. Same enterprise infrastructure, priced where SMBs already live.
Net-revenue-retentive by design
Every customer recovers more revenue than they spend by month two. The product compounds: more conversations → smarter agents → tighter retention → higher NRR.
[email protected] · Direct intro preferred
Ready?
Never miss a call
again.
Set up in 60 seconds. cancel anytime. billed at the plan rate today, cancel anytime.