The Infrastructure for AI Voice and Sound
Automate phone calls for leads, bookings, support, payment reminders and more — in natural voice, 24/7.
Low latency
Turbo TTS and fine-tuned STT run together for real-time natural conversations.
Smart turn-taking
Custom interruption and timing logic lets agents speak and listen naturally — just like a real human.
Bring any LLM
Swap between Gemini, Claude, GPT any time or bring your own custom implementation.
Live function calling
Integrate with any third party app to get real time information or take action.
Thousands of voices
Find a voice for any use case, situation or character from our library or clone your own.
Audit and evaluate
Monitor calls with full transcripts, recordings and automated evaluation.
Multilingual support
Speak to users in 12+ languages — with correct pronunciation and tone.
Built on your knowledge base
Import existing documentation so your agents know everything about your business and products.
Take phone calls
Integrate seamlessly with Twilio using μ-law 8000 Hz audio encoding.
Use Cases
See how voice AI fits right into your everyday workflows.
Customer Support
Handle inquiries 24/7, reduce wait times, and maintain consistent brand voice. Process returns, answer FAQs, and escalate when needed — all with natural conversation.
Appointment Booking
Let customers book, reschedule, or cancel appointments by speaking naturally on a call — ideal for healthcare, salons, repair services, and more.
Lead & Sales Outreach
Make automated calls to qualify leads or pitch products. Threetone adapts in real-time based on responses and sends warm leads to your sales team.
Surveys & Feedback
Conduct dynamic voice surveys to gather insights post-service or after product delivery — perfect for NPS, CSAT, and market research.
Payment
Gently remind customers about due payments or offers. The AI handles objections, answers questions, and logs outcomes automatically.
Education
Provide personalized learning experiences with explanations, quizzes, and adaptive lessons — making education more accessible.