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Async (Podcastle)

High-performance AI voice API for ultra-realistic text-to-speech, instant cloning, and low-latency streaming.

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By Async, Inc. • Founded 2021
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About Async (Podcastle)

Async provides ultra-realistic AI voice infrastructure for building voice agents and audio apps. It features high-fidelity TTS, instant cloning, and high-concurrency streaming at competitive usage-based pricing, making it a powerful, scalable alternative to legacy voice platforms.

Features

  • Instant Voice Cloning
  • High-Speed Text-to-Speech (TTS) API
  • Ultra-Low Latency Streaming
  • 500+ High-Fidelity Multilingual Voices
  • High Concurrency Parallel Requests

Pros & Cons

Pros

  • Extremely low latency suitable for real-time applications.
  • Highly competitive pay-as-you-go pricing ($0.50/hour).
  • High-quality, human-like voice inflections and cloning.

Cons

  • Limited parallel requests (1) on the free tier.
  • Small initial free credit pool (1 hour).

Pricing

Free tier

$0

  • Access to our text-to-speech and voice models
  • 1 instant voice cloning
  • 1 parallel request
  • Docs & community support

Developer

$0.5 per/hour

  • Access to our text-to-speech, voice and streaming models
  • Unlimited instant voice cloning
  • 5 parallel requests
  • Live chat / email support

Enterprise

Custom

  • Access to our text-to-speech, voice and streaming models
  • Unlimited instant voice cloning
  • Custom rate limits & concurrency to match any workload
  • Dedicated technical support (first response < 1 hour)
  • Enterprise-grade security and user management
  • Early access to new models

Use Cases

Real-time AI Voice Agents & Support

Automated Audiobook & Podcast Production

Dynamic In-game Character Dialogue

Personalized Marketing & Video Narration

Accessibility Tools for Screen Readers

How to Use Async (Podcastle)

1. Sign up on Async.com and retrieve your API Key from the developer dashboard. 2. Choose between the TTS, Streaming, or Voice Cloning endpoints. 3. Integrate the API into your application using provided SDKs or standard HTTP requests.

Demo Video

Watch this video to see Async (Podcastle) in action and learn how to get the most out of it.

Frequently Asked Questions

Yes, you can upgrade or downgrade at any time with changes taking effect immediately.

Reviews

Reviews coming soon.