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What is chapterpass?

Audible's ACX has established eight technical standards that must be met, with any file that does not satisfy even one of these standards being rejected without exception. Chapterpass takes great care in preparing each chapter file to meet these requirements, ensuring that the RMS loudness falls between -23 and -18 dBFS, peak levels remain below -3 dBFS, the noise floor is kept under -60 dBFS RMS, and room tone is included at both the start and finish, all while producing a 192 kbps CBR MP3 file. Every audio file undergoes a thorough review to verify compliance with all specifications before it becomes available for download, allowing users to view precise measurements for each requirement at all checkpoints. The entire processing occurs in the user's browser through the use of WebAssembly technology, which ensures that audio files are kept on the user's device throughout the operation. Users can utilize the service without the need for an account; the first file is offered free of charge, while subsequent files incur fees of $36 per finished hour, $27 for five hours or more, and $18 for ten hours or more, all billed by the second. Furthermore, a complimentary measurement tool is available at /free-acx-check, enabling users to assess loudness, peak levels, noise floor, and silence padding in relation to the specifications without performing any mastering. Although Chapterpass specializes in mastering the essential technical standards, it does not engage in editing, noise removal, or any corrections to narration, thereby ensuring a smooth and efficient process for creators seeking to meet ACX requirements. This commitment to quality and compliance allows creators to focus on their content while trusting that their audio will meet industry standards.

What is Loudness Toolkit?

The Loudness Toolkit is recognized as the top choice for ensuring that audio outputs comply with loudness standards. It includes all necessary tools for generating consistently loudness-normalized audio, seamlessly integrated into the production workflow across various formats, ranging from stereo to 7.1.2-channel surround sound. By following industry standards, users gain confidence and peace of mind in their audio endeavors. The VisLM feature offers comprehensive support, delivering intuitive, accurate, and timely assistance. Its cutting-edge design emphasizes critical loudness metrics, blending a broad overview with detailed historical insights, which enables users to hit their loudness goals effectively on their first attempt, without fail. This combination of reliability and efficiency positions VisLM as an essential resource for audio professionals dedicated to achieving high-quality results in their work. In a constantly evolving industry, having such a robust tool can significantly enhance the creative process and overall audio quality.

Media

No images available

Media

Integrations Supported

Additional information not provided

Integrations Supported

Additional information not provided

API Availability

API Availability

Pricing Information

$36 per finished hour
Free Version

Pricing Information

$899 one-time payment
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Standard Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

chapterpass

Date Founded

2026

Company Location

Italy

Company Website

chapterpass.com

Company Facts

Organization Name

NUGEN Audio

Date Founded

2004

Company Location

United Kingdom

Company Website

nugenaudio.com/loudnesstoolkit

Categories and Features

Audio Mastering

Not specified

Categories and Features

Music Production

Not specified

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