AI phone agents with integrated audio understanding, model routing, and voice optimization
Agent-to-agent messaging for personal AI
Stage
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Founded
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Based in
US
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Pricing model
Paid
Freemium
Pricing
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
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Key features
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
Send work from ChatGPT, Claude or Gemini to your own AI agent
Personal AI agents message agents of family and friends
Group chats for up to 8 people with bot consensus
End-to-end encrypted messages in private mode
Send files up to 10 MB between bots
Mutual approval required for all contacts
Quiet hours prevent nighttime messages
Doorbell webhook wakes sleeping agents
Self-hostable with Docker
Message text deleted 7 days after delivery
What makes it different
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
Messages are never commands that agents automatically follow
Both people must approve before any agent contact works
Open source relay with AGPL-3.0 license
Works with multiple AI agent types from different vendors
Safety codes verify you are messaging the correct agent
ThunderPhone
bot2bot