The publication of record for AI voice telephony

Companies

The companies building AI agents that make and receive phone calls — and the infrastructure underneath.

42 companies
3CLogic
Enterprise cloud contact center platform with AI voice agents
White-LabelConversational AI (Enterprise)Inbound Support
Acquired—
AI Rudder
Voice AI for real estate agents and brokers
Lead QualificationConversational AI (Enterprise)Appointment Setting
——
AgentPhone
AI voice agent platform for business communications
TTS / Voice SynthesisConversational AI (Enterprise)Outbound Sales / SDR
——
AgentPhone.ai
AI voice agents for phone calls
Conversational AI (Enterprise)Voice Agent PlatformTelephony / SIP
Seed—
AssemblyAI
Speech-to-text and audio intelligence API
STT / Speech RecognitionVoice Analytics / QA
Series C$63M
Assort Health
AI voice agent platform for healthcare patient engagement
Conversational AI (Enterprise)Inbound SupportAppointment Setting
——
Bland AI
Enterprise platform for AI phone calls
Voice Agent PlatformDeveloper API
Series B$85M
Bolna
Open-source AI voice agent platform for building conversational phone applications
Self-Hosted OptionConversational AI (Enterprise)Voice Agent Platform
Seed—
Cartesia
Real-time multimodal AI models
TTS / Voice SynthesisVoice Infrastructure
Series A$91M
Coval
Low-code platform for building and deploying voice AI agents
Conversational AI (Enterprise)No-Code / Low-CodeVoice Agent Platform
——
Deepdub
AI dubbing and voice synthesis platform for global content localization
TTS / Voice Synthesis
——
Deepgram
Voice AI platform with speech-to-text foundation
TTS / Voice SynthesisSTT / Speech RecognitionVoice Infrastructure
Series B$86M
ElevenLabs
AI voice generation and synthesis
TTS / Voice Synthesis
Series C$281M
Giga
AI voice agents for enterprise customer service and sales
Lead QualificationConversational AI (Enterprise)Inbound Support
——
Goodcall
AI voice platform for customer service and business communications
Conversational AI (Enterprise)Inbound SupportVoice Agent Platform
——
Hyro
Conversational AI platform for enterprise healthcare voice interactions
Conversational AI (Enterprise)Inbound SupportAppointment Setting
Series B—
Kotoba Technologies
AI voice agents for customer service and enterprise communications
Conversational AI (Enterprise)Inbound SupportVoice Agent Platform
——
LiveKit
Open source infrastructure for voice and video agents
Self-Hosted OptionVoice Agent PlatformDeveloper API
Series B—
Murf AI
AI voice synthesis platform for creating professional voiceovers and voice content
TTS / Voice SynthesisNo-Code / Low-CodeDeveloper API
——
Newo.ai
AI voice platform for automating customer service and outbound calls
Lead QualificationConversational AI (Enterprise)Inbound Support
——
Omilia
Enterprise conversational AI platform for customer service automation
Conversational AI (Enterprise)Inbound SupportFinancial Services Voice
——
Orvera AI
AI voice agent platform for enterprise customer service and sales
Lead QualificationConversational AI (Enterprise)Inbound Support
——
Pauzio
AI voice agent platform for inbound customer support and service automation
Conversational AI (Enterprise)Inbound SupportNo-Code / Low-Code
——
Phonely
AI voice agent platform for customer service automation
Conversational AI (Enterprise)Inbound SupportNo-Code / Low-Code
——
Pindo
AI voice agent platform for customer service and support automation
Conversational AI (Enterprise)Inbound SupportVoice Agent Platform
——
Pipecat
Open-source framework for building multi-modal AI agents with voice
Voice Agent PlatformDeveloper APIVoice Infrastructure
——
PolyAI
Customer-led conversational AI for enterprise call centers
Hospitality VoiceConversational AI (Enterprise)Inbound Support
Series C$120M
Prosper AI
AI voice agents for outbound sales and customer engagement
Lead QualificationConversational AI (Enterprise)Outbound Sales / SDR
——
Regal AI
Enterprise voice AI platform for customer-facing business operations
Conversational AI (Enterprise)Inbound SupportOutbound Sales / SDR
——
Retell AI
Conversational voice API for real-time AI agents
Voice Agent PlatformDeveloper API
Seed$4.6M
Ringg
AI voice platform for outbound sales and customer engagement
Lead QualificationConversational AI (Enterprise)Appointment Setting
——
Ringg AI
AI voice agent platform for enterprise customer interactions
Conversational AI (Enterprise)Inbound SupportAppointment Setting
——
Seavoice
AI voice agent platform for customer support and business communications
Conversational AI (Enterprise)Inbound SupportVoice Agent Platform
——
Simple AI
AI voice platform for automating customer support and sales calls
Lead QualificationConversational AI (Enterprise)Inbound Support
——
Smallest.ai
AI voice agent platform for small businesses and enterprises
Conversational AI (Enterprise)Inbound SupportAppointment Setting
——
Sonari
Real-time voice QA and call analytics
Voice Analytics / QA
Acquired$28M
SoundHound
Conversational AI platform for enterprise voice applications
TTS / Voice SynthesisConversational AI (Enterprise)Voice Agent Platform
——
Synthflow
No-code AI voice agent builder
Appointment SettingNo-Code / Low-CodeVoice Agent Platform
Seed$10.5M
Synthflow AI
No-code AI voice agent platform for automating customer conversations
Lead QualificationConversational AI (Enterprise)Inbound Support
——
Telnyx
Programmable communications and voice infrastructure
Telephony / SIPDeveloper APIVoice Infrastructure
Series B$32M
Twilio
Communications platform with growing voice AI footprint
Telephony / SIPDeveloper APIVoice Infrastructure
Public$614M (pre-IPO)
Vapi
Developer platform for voice AI agents
No-Code / Low-CodeVoice Agent PlatformDeveloper API
Series A$23M
Company Index — The Call Stack