Async vs. Inworld TTS Comparison


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About Async is a developer-first AI voice platform, rooted in technology that powers Podcastle, offering premium text-to-speech and voice cloning via a simple, high-performance API. Developers gain access to broadcast-quality, natural-sounding voices with under-200 ms latency, and can create personalized voice clones using just a three-second audio sample. It supports streaming output so audio plays as it’s generated, and offers transparent usage-based billing with real-time daily stats and per-second cost control. Built to scale from prototypes to full production, Async makes advanced voice capabilities accessible to indie developers and enterprises alike, backed by the same trusted infrastructure that fueled Podcastle.	About Inworld TTS is a state-of-the-art text-to-speech platform designed to deliver ultra-realistic, context-aware speech synthesis and precise voice-cloning capabilities at a radically accessible price. The flagship model, TTS-1, is optimized for real-time applications and supports low-latency streaming (first audio chunk in ≈200 ms) as well as multiple languages (including English, Spanish, French, Korean, Chinese, and more). Developers can use instant zero-shot voice cloning (5-15 seconds of audio) or professional fine-tuned cloning, add voice-tags for emotion, style, and non-verbal sounds, and switch languages while preserving voice identity. The larger TTS-1-Max model (in preview) offers even more expressive speech and multilingual strength. The platform supports both API and portal access, streaming or batch mode, and is designed for everything from interactive voice agents and gaming characters to branded audio experiences.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Developers wanting a tool to get natural voice generation and cloning for apps	Audience Developers and businesses looking for a tool offering multilingual voice synthesis and custom-voice cloning at scale
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Supported	API Offers API Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing $1 per hour Free Version Supported Free Trial Not Supported	Pricing $0.005 per minute Free Version Not Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software

Training Documentation Supported Webinars Not Supported Live Online Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Supported In Person Not Supported
Company Information Async United States async.ai/	Company Information Inworld Founded: 2021 United States inworld.ai/tts
Alternatives Rekam AI	Alternatives Gemini 3.1 Flash TTS Google
Fish Audio Hanabi AI	Gemini 3.8 Flash-Lite TTS Google
Supavocal	Gemini 3.8 Flash TTS Google
smallest.ai	Qwen3-TTS Alibaba
$MorVoice$ MorVoice View All	Chirp 3 Google View All
Categories AI Voice Generators Supported Podcast Editing Supported Text to Speech Supported Voice Cloning Supported	Categories AI Voice Models Supported Text to Speech Supported Text-to-Speech (TTS) Models Supported

Integrations Claude Not Supported Fireworks AI Not Supported Google AI Overviews Not Supported Groq Not Supported Inworld Not Supported JavaScript Supported LiveKit Not Supported Mistral AI Not Supported OpenAI Not Supported Podcastle Supported Python Supported Tenstorrent DevCloud Not Supported Twilio Supported Vapi AI Not Supported gpt-oss-20b Not Supported Show More Integrations View All 4 Integrations	Integrations Claude Supported Fireworks AI Supported Google AI Overviews Supported Groq Supported Inworld Supported JavaScript Not Supported LiveKit Supported Mistral AI Supported OpenAI Supported Podcastle Not Supported Python Not Supported Tenstorrent DevCloud Supported Twilio Not Supported Vapi AI Supported gpt-oss-20b Supported Show More Integrations View All 11 Integrations
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