Top Voice & Conversational Interfaces companies 2026

#04

DeepL

DeepL provides neural machine translation and launched DeepL Voice in 2024 for real-time speech-to-speech translation.

Speech Translation · Series C $300M

#05

Decagon builds AI customer-support agents that handle ticket resolution, live chat, and voice calls for mid-market and enterprise SaaS companies.

Enterprise Voice Agents · Series D $250M

Enterprise Voice Agents

#06

Dialpad provides a cloud business communications platform with built-in voice AI for real-time transcription, sentiment analysis, and agent coaching.

Contact Center AI · Series F $170M

#07

Sesame builds fast, high-fidelity voice models for conversational AI with a focus on multilingual support and low-latency inference.

TTS / Voice Synthesis · Series B $250M

TTS / Voice Synthesis

#08

Cresta provides real-time AI coaching and automation for contact-center agents, analyzing voice and chat to improve sales and support outcomes.

Contact Center AI · Series D $125M

#09

Kore.ai provides an enterprise conversational AI platform for contact centers, covering voice, chat, and automation across 100+ channels.

Enterprise Voice Agents · Growth $150M

Enterprise Voice Agents

#10

Deepgram provides deep-learning-based automatic speech recognition and text-to-speech APIs for real-time transcription and voice synthesis.

STT / ASR · Series C $130M

#11

Observe.AI provides voice analytics and agent-assist tools for contact centers, analyzing 100% of calls for compliance and coaching.

Contact Center AI · Series C $125M

#12

PolyAI builds conversational AI for enterprise contact centers, specializing in restaurant reservations, hospitality, and logistics support.

Enterprise Voice Agents · Series D $86M

Enterprise Voice Agents

#13

Cartesia develops ultra-low-latency voice models including Sonic, achieving ~40ms time-to-first-audio for real-time conversational AI.

TTS / Voice Synthesis · Series B $100M

TTS / Voice Synthesis

#14

SoundHound AI builds a voice-native conversational AI platform powering in-car assistants, restaurant drive-thru and phone ordering, and enterprise agents through its Amelia platform.

Enterprise Voice Agents · SPAC merger (IPO)

Enterprise Voice Agents

#15

LiveKit provides open-source infrastructure for real-time audio and video, powering voice-agent orchestration and WebRTC-based communication.

Voice Agent Infrastructure · Series C $100M

Voice Agent Infrastructure

#16

Cognigy builds enterprise conversational AI for customer service, supporting voice, chat, and omnichannel deployments.

Enterprise Voice Agents · Acquired NICE

Enterprise Voice Agents

#17

AssemblyAI provides AI-powered speech-to-text APIs with sentiment analysis, speaker diarization, and real-time transcription features.

STT / ASR · Series C $50M

#18

Sanas builds real-time accent conversion technology for contact-center agents, translating non-native accents to standard dialects on live calls.

Accent Conversion · Series B $65M

#19

Yellow.ai provides a conversational AI platform for customer service and employee support with voice, chat, and automation features.

Enterprise Voice Agents · Series C $78.2M

Enterprise Voice Agents

#20

Wispr Flow makes an AI voice-dictation app that turns natural speech into clear, formatted text in any application across Mac, Windows, iPhone, and Android.

Voice Dictation · Series A $25M

#21