Voice Infrastructure
STT, TTS, telephony for voice agents.
Vapi
Voice AI platform: STT, TTS, telephony, turn-taking for voice agents.
used in
1
commercial
usage
Whisper large-v3
Open-weights automatic speech recognition (STT) model.
used in
1
open source
free
AssemblyAI
Speech-to-text and speech understanding API for developers building voice products.
used in
0
commercial
usage
Cartesia
Low-latency voice AI platform built around the Sonic text-to-speech model.
used in
0
commercial
freemium
Deepgram
Voice AI platform providing speech-to-text, text-to-speech, and a unified voice agent API.
used in
0
commercial
usage
ElevenLabs
Voice AI platform offering text-to-speech, speech-to-text, and a conversational agents platform.
used in
0
commercial
freemium
LiveKit Agents
Open-source realtime framework from LiveKit for building voice, video, and multimodal AI agents.
used in
0
hybrid
freemium
OpenAI Realtime API
Speech-to-speech realtime model API for building low-latency voice agents.
used in
0
commercial
usage
Pipecat
Open-source Python framework from Daily for building realtime voice and multimodal conversational agents.
used in
0
hybrid
freemium
Retell AI
Voice agent platform focused on low-latency conversation.
used in
0
commercial
usage