Which voices are available in Open-Audio TTS?

The tool features a suite of high-quality voices including Alloy (neutral), Echo (professional), Fable (warm), Nova (energetic), Onyx (authoritative), and Shimmer (soft).

Does it support real-time audio?

Yes, it supports real-time streaming, allowing audio playback to begin before the entire text file has finished processing.

What is the character limit per request?

The maximum character limit per individual API request is typically 4,096 characters, but longer texts can be processed by splitting them into multiple segments.

What is the difference between TTS Standard and TTS HD?

TTS Standard is optimized for speed and low latency, making it ideal for real-time apps. TTS HD provides higher audio fidelity, suitable for professional media production.

Are there any recurring monthly fees?

The tool generally operates on a prepaid credit system or pay-as-you-go basis through the OpenAI API, meaning you only pay for the characters you convert.

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Text to speech

Freemium

Open-Audio TTS

Convert text into lifelike speech using OpenAI-powered models. Supports multiple voices, real-time streaming, and high-definition audio for professional narration and accessibility.

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Rating

Reviews

Upvotes

3 months ago

Listed

Text to speech

AI Voice Generator

OpenAI TTS

Voiceovers

Audiobooks

Accessibility

Content Creation

Speech Synthesis

Multilingual AI

Tool information

Provider

Open-Audio / OpenAI

Platforms

Web

Languages

English

Chinese

Japanese

German

French

Spanish

Korean

Arabic

Russian

Dutch

Italian

Polish

Portuguese

API Available

Yes

Added to directory

3 months ago

Last updated

about 1 month ago

Rating

Not available

Pricing

Freemium

About Open-Audio TTS

What the tool does and who it's for

Open-Audio TTS is a high-performance web-based text-to-speech application that leverages OpenAI's advanced models (including TTS-1 and TTS-1-HD) to transform written content into natural-sounding audio. It provides users with a selection of professional voices such as Alloy, Echo, Fable, Onyx, Nova, and Shimmer, optimized for various use cases from audiobook narration to real-time voice assistants. The tool supports multiple output formats including MP3, Opus, AAC, and FLAC, and offers fine-grained control over speech parameters like speed and tone. Designed for both accessibility and professional content creation, it allows for high-fidelity audio generation with low latency and multilingual support across 13+ languages.

Key capabilities

OpenAI-Powered Models: Utilizes state-of-the-art TTS-1 and TTS-1-HD models for superior audio quality.

Diverse Voice Library: Access to multiple distinct voice profiles including Shimmer, Nova, Onyx, Fable, and Echo.

Real-time Streaming: Supports low-latency audio streaming for conversational AI applications.

High-Definition Audio: Optional HD mode for professional-grade fidelity in podcasts and books.

Multilingual Support: Seamlessly handles text in 13+ major global languages without phoneme reliance.

Customizable Speed: Adjustable speech rate to match specific listening or branding preferences.

Multiple Export Formats: Save audio in MP3, Opus, AAC, FLAC, or WAV formats.

Batch Processing: Capable of handling long-form text by splitting requests efficiently.

Instruction Following: Advanced control over tone, emphasis, and pacing via text commands.

Pricing

Freemium — plans below

Free Credits

$5 free initial credits
Standard TTS access
No credit card required to start
Access to basic voice library

TTS Standard

TTS HD

$30 / 1M chars

Premium high-definition audio
Best for audiobooks and podcasts
Fidelity-optimized (tts-1-hd)
Unlimited format options

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FAQ

Open-Audio TTS FAQs

Common questions about Open-Audio TTS