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Open-source / Self-host

Free-only

Retell Create agent: templates plus Generate from prompt

Retell

Pay-as-you-go voice agents

Best for Audio

Freemium

WellSaid studio composer: script, voice actor, style, and Play

WellSaid

AI voiceover studio

Best for Audio

Freemium

Cartesia signed-out Sonic composer: support script, Jacqueline, Play

Cartesia

Realtime TTS/STT and voice agents

Best for Audio

Freemium

Adobe Podcast official Enhance Speech workbench with strength slider and file queue

Adobe Podcast

Enhance Speech + Studio

Best for Audio

Freemium

Wondercraft studio composer: What do you want to create, PDF JPEG MP3 MOV TXT chips

Wondercraft

AI audio/video studio

Best for Audio

Freemium

Gladia Getting started docs with official API Keys developer console

Gladia

Speech-to-text API

Best for Audio

Freemium

livekit/livekit GitHub file list: pkg and cmd folders, Apache-2.0 in About

LiveKit

Realtime rooms + voice agents

Best for Audio · Code / Agents

Open source
Freemium
Self-host

pipecat-ai/pipecat GitHub file list: src/pipecat and examples, BSD-2-Clause in About

Pipecat

BSD-2 voice-agent pipeline

Best for Audio · Code / Agents

Open source
Self-host
Code

Soniox official docs: Speech-to-Text, Text-to-Speech, and Translate products

Soniox

Speech API + app

Best for Audio · Code / Agents

Freemium
Code

Inworld TTS Playground: voice, model, delivery, and talking-speed controls

Inworld

TTS/STT/LLM credits

Best for Audio

Freemium

tl;dv meeting notes workspace: timestamped notes, Ask AI, recording player

tl;dv

Meeting recorder and AI notes

Best for Productivity · Audio

Freemium

AssemblyAI docs: Voice AI Infrastructure getting started

AssemblyAI

Voice AI API

Best for Audio

Freemium