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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 Euphona?

Euphona brings mastering, stem separation, restoration, vocal tuning, mixing and spatial audio together in one browser-based platform. Instead of each tool re-analysing your track, Euphona analyses a mix, stem set or raw recording once (loudness and dynamics over time, spectral balance, key, tempo, transients and damage) and every capability works from that result. Mastering reports measured loudness and holds a -1.0 dBTP true-peak ceiling by default; stem separation delivers up to six stems; restoration targets hum, clicks, noise, clipping and room; mixing works from the stems you supply; spatial audio produces a binaural headphone version. Results are always auditioned level-matched against the original. Teams that process audio at volume can use the developer API, which runs the same engine and offers free test keys. Euphona also provides free no-account tools: a loudness checker, BPM and key finder, spectrum analyser, stereo width analyser, clipping detector and vocal remover. Uploaded audio is not used for model training. Euphona is built by SOGV2 Limited in Hong Kong.

Media

No images available

Media

Integrations Supported

Additional information not provided

Integrations Supported

Additional information not provided

API Availability

API Availability

Has API

Pricing Information

$36 per finished hour
Free Version

Pricing Information

$15/month
Free: 10 minutes granted once at signup, no card required; the full engine with a level-matched preview, and exports bought per track. Creator: $15/month, 120 minutes. Professional: $29/month, 400 minutes. Max: $79/month, 1,500 minutes. All paid plans include unlimited full-quality exports; annual billing is 17% less. Per track: $0.80 a minute, never below $2 or above $8 per track. Minute packs: 30 minutes for $15 or 100 minutes for $40. Developer API: pay as you go from $0.35 down to $0.15 per processed minute; test mode is free. Prices in US dollars, excluding VAT or sales tax.
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / 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

SOGV2 Limited

Date Founded

2026

Company Location

Hong Kong

Company Website

euphonaai.com/

Categories and Features

Audio Mastering

Not specified

Categories and Features

Audio Mastering

Euphona's AI mastering technology begins by thoroughly analyzing the entire track, taking into account loudness fluctuations, dynamic range over time, spectral distribution, and transient response. It generates a master that typically features a true-peak ceiling of -1.0 dBTP along with a detailed loudness report. When you listen to the master, it is level-matched to your original track, ensuring that the comparison highlights tonal quality and dynamics instead of just volume differences. This comprehensive analysis supports additional features such as stem separation, audio restoration, vocal tuning, mixing, and spatial audio enhancement, all accessible via a developer API.

Not specified

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