AI phone agents with integrated audio understanding, model routing, and voice optimization
Stage
Not given
Not given
Founded
Not given
Not given
Based in
Not given
US
Pricing model
Free
Paid
Pricing
Free forever with all features included
Cost-plus pricing: customers pay vendor list prices for models and voice plus hosting (15% of vendor costs, 0.5¢ to 2¢ per minute) plus company margin (17-25%). Lean calls cost from 2.0¢/min (1.18¢ vendors + 0.50¢ hosting + 0.35¢ margin). Receptionist calls cost 4.7¢/min (3.36¢ vendors + 0.50¢ hosti
Key features
Alerts on iPhone and Android with answer buttons
Phone call escalation for high and critical alerts
Breaks through silent mode and Do Not Disturb
Attachments and notes on every alert
Broadcast to a channel with one person taking ownership
See who acted and who ignored alerts
Answer buttons set by you or your AI
Callback webhooks to return answers to your code
Setup via pasted prompt or API key-free send link
Integration with AI frameworks, automation platforms and HTTP API
Multi-model architecture running multiple transcription and language models per call
Zeus AI agent that builds, tests and tunes voice agents automatically
Simulated call testing before live deployment
Live call monitoring and observability
A/B testing and automated fix suggestions
Integration wizard for CRM, VoIP and business software
Client portals for managing multiple agents
Knowledge base integration for agent grounding
Outbound campaigns with CSV upload and scheduling
What makes it different
Full-volume alerts that interrupt even when phone is silenced
No SDK, API key or card required to start
Free forever with every feature for every team member
Escalates to phone calls for critical alerts that go unanswered
Works with existing AI agents, workflows and monitoring tools
Cost-plus pricing with no margin markup pass-through when vendor prices drop
Fully agentic Zeus AI that handles entire lifecycle from creation to optimization
Multi-model architecture for superior audio understanding vs 3-step pipelines
Starts at 2¢/min, cheaper than competitors and call center labor
M91
ThunderPhone