Voice AI for Builders
Orchestration platforms, real-time infrastructure, STT/TTS APIs, and conversation frameworks for production voice AI products.
Voice AI workflow guides
Phone Agent from Zero
Build a phone-based voice AI agent from first number to monitored launch, with stack choices, call-flow design, consent, cost, and failure testing.
Realtime Speech-to-Speech Voice Agent
Use native speech-to-speech models when natural prosody, interruption, and fast prototype velocity matter more than component-level STT/TTS control.
Realtime STT-to-LLM-to-TTS Pipeline
Build a modular voice pipeline where transport, VAD, STT, LLM, TTS, and observability can be measured, swapped, and scaled independently.
Turn Detection and Barge-In Optimization
Tune VAD, endpointing, echo control, and interruption policy so a voice agent knows when to listen, when to stop speaking, and when to ignore noise.
36 tools
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Agora NewRealtime engagement infrastructure for voice, video, streaming, and AI agents
#realtime_infrastructure Freemium #Real-timeโ ๏ธ 3 things to know before committing -
AssemblyAI NewSpeech-to-text and speech understanding API for production voice applications
#stt Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Bland AI NewHosted AI phone agent platform for outbound and inbound voice workflows
#voice_agent_platform Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Botpress NewVisual AI agent platform that can connect web, chat, and voice channels
#conversation_framework from $89/moโ ๏ธ 3 things to know before committing -
Chatterbox Open SourceOpen-source TTS model with voice cloning and emotion control
#tts Free #Open Sourceโ ๏ธ 4 things to know before committing -
Cartesia PopularLow-latency streaming TTS for realtime voice agents
#tts Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Daily NewWebRTC audio and video infrastructure for realtime apps and voice agents
#realtime_infrastructure Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Deepgram PopularFast streaming speech-to-text API for realtime voice AI
#stt Freemium #Real-timeโ ๏ธ 3 things to know before committing -
F5-TTS
Open SourceOpen-source flow matching TTS model for zero-shot voice cloning
#tts Free #Open Sourceโ ๏ธ 4 things to know before committing -
faster-whisper
Open SourceFast open-source Whisper inference using CTranslate2 for local transcription
#stt Free #Open Sourceโ ๏ธ 3 things to know before committing -
ElevenLabs PopularHosted voice and audio generation default for quality-focused teams
#tts from $6/mo #Real-timeโ ๏ธ 4 things to know before committing -
Gladia NewRealtime and batch speech-to-text API for multilingual voice products
#stt Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Janus Gateway Open SourceOpen-source general-purpose WebRTC server with plugin-based media routing
#realtime_infrastructure Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
Krisp NewAI noise cancellation and meeting audio cleanup for calls and recordings
#audio_cleanup from $8/mo #Real-timeโ ๏ธ 3 things to know before committing -
LangGraph Open SourceOpen-source graph runtime for stateful agent workflows and voice orchestration
#conversation_framework Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
LiveKit Open SourceOpen-source realtime audio infrastructure for voice agents
#realtime_infrastructure Freemium #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
mediasoup Open SourceOpen-source WebRTC SFU for custom realtime audio and video infrastructure
#realtime_infrastructure Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
OpenVoiceOS
Open SourceOpen-source privacy-focused voice assistant platform for custom devices
#voice_agent_platform Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
OptimizerAI NewAI sound effect generator for games, videos, and interactive prototypes
#sound_effects Freemiumโ ๏ธ 3 things to know before committing -
OpenAI Realtime API PopularNative speech-to-speech API for low-latency voice agents
#voice_agent_platform Paid #Real-timeโ ๏ธ 3 things to know before committing -
Pipecat Open SourceOpen-source framework for realtime voice and multimodal agents
#conversation_framework Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
PlayHT NewHosted AI voice generator with voice cloning, API access, and multilingual voices
#voice_cloning from $39/mo #Real-timeโ ๏ธ 3 things to know before committing -
Rasa Open SourceOpen-source conversational AI framework for assistants and dialogue control
#conversation_framework Free #Open Sourceโ ๏ธ 3 things to know before committing -
Resemble AI PopularVoice cloning platform with pay-as-you-go TTS and safeguards
#voice_cloning Freemium #Real-timeโ ๏ธ 4 things to know before committing -
Retell AI PopularLow-code voice agent platform for phone and web AI calls
#voice_agent_platform Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Silero VAD Open SourceLightweight open-source voice activity detection for speech apps
#conversation_framework Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
so-vits-svc Open SourceOpen-source singing voice conversion project for experimental creator workflows
#voice_changer Free #Open Sourceโ ๏ธ 3 things to know before committing -
SpeechBrain
Open SourceOpen-source speech toolkit for ASR, speaker recognition, and speech research
#stt Free #Open Sourceโ ๏ธ 3 things to know before committing -
TEN Framework Open SourceOpen-source realtime multimodal framework for conversational voice AI agents
#voice_agent_platform Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
Twilio Voice
NewTelephony and programmable voice APIs for calls, agents, and contact center flows
#realtime_infrastructure Freemium #Real-timeโ ๏ธ 3 things to know before committing -
Vapi PopularDeveloper-first voice AI orchestration platform with SDKs and phone integrations
#voice_agent_platform Freemium #Real-timeโ ๏ธ 4 things to know before committing -
VibeVoice Open SourceOpen-source long-form multi-speaker conversational TTS research project
#tts Free #Open Sourceโ ๏ธ 3 things to know before committing -
Vocode Open SourceOpen-source framework for programmable voice agents and phone calls
#conversation_framework Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing -
Voice.ai NewAI voice changer, TTS, and voice tool suite with a free tier
#voice_changer from $5/mo #Real-timeโ ๏ธ 3 things to know before committing -
Voicebox Open SourceLocal-first open-source voice cloning, TTS, dictation, and agent voice studio
#voice_cloning Free #Open Sourceโ ๏ธ 4 things to know before committing -
W-Okada Voice Changer Open SourceOpen-source realtime voice changer with local and Colab workflows
#voice_changer Free #Real-time #Open Sourceโ ๏ธ 3 things to know before committing