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About

WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable compilation target for programming languages, enabling deployment on the web for client and server applications. The Wasm stack machine is designed to be encoded in a size- and load-time-efficient binary format. WebAssembly aims to execute at native speed by taking advantage of common hardware capabilities available on a wide range of platforms. WebAssembly describes a memory-safe, sandboxed execution environment that may even be implemented inside existing JavaScript virtual machines. When embedded in the web, WebAssembly will enforce the same-origin and permissions security policies of the browser. WebAssembly is designed to be pretty-printed in a textual format for debugging, testing, experimenting, optimizing, learning, teaching, and writing programs by hand. The textual format will be used when viewing the source of Wasm modules on the web.

About

Audible's ACX has eight technical checkpoints, and a file that misses one comes straight back. chapterpass masters each chapter file to spec: RMS loudness between -23 and -18 dBFS, peaks held below -3 dBFS, a noise floor under -60 dBFS RMS, room tone at the head and tail, and a 192 kbps CBR MP3 on the way out. Every output is verified against the full spec before download, and you see the measured value next to the requirement for each checkpoint. The processing runs in your browser through WebAssembly, so your audio never leaves your device. There is no account to create. Your first file is free, then $36 per finished hour, $27 from 5 hours, $18 from 10 hours, billed by the second. A free measurement page at /free-acx-check reads your loudness, peak, noise floor and silence padding against the spec without mastering anything. chapterpass masters the measurable technical specs. It does not edit your recording, remove noise, or fix narration.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises 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 Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers

Audience

Audiobook narrators, indie authors narrating their own books, audiobook producers and post-production studios preparing files for Audible ACX

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

Free
Free Version Supported
Free Trial Not Supported

Pricing

$36 per finished hour
Free Version 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 Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

WebAssembly
Founded: 2015
webassembly.org

Company Information

chapterpass
Founded: 2026
Italy
chapterpass.com

Alternatives

AssemblyScript

AssemblyScript

The AssemblyScript Project

Alternatives

Modsurfer

Modsurfer

Dylibso
Loudness

Loudness

Loudness.fm
Elevate

Elevate

Newfangled Audio

Categories

Categories

Audio Mastering Supported

Integrations

AssemblyScript Supported
BlazorPlate Supported
BoxLang Supported
Extism Supported
Gideros Supported
Graphite Supported
Indent Supported
Kitesurf Supported
ML Console Supported
Meshpage.org Supported
Metatable Supported
Modsurfer Supported
Second State Supported
SurrealDB Supported
Wasmer Supported
WebContainers Supported
Zed Supported
Zellij Supported
ai-coustics Supported
fastText Supported

Integrations

AssemblyScript Not Supported
BlazorPlate Not Supported
BoxLang Not Supported
Extism Not Supported
Gideros Not Supported
Graphite Not Supported
Indent Not Supported
Kitesurf Not Supported
ML Console Not Supported
Meshpage.org Not Supported
Metatable Not Supported
Modsurfer Not Supported
Second State Not Supported
SurrealDB Not Supported
Wasmer Not Supported
WebContainers Not Supported
Zed Not Supported
Zellij Not Supported
ai-coustics Not Supported
fastText Not Supported
Claim WebAssembly and update features and information
Claim WebAssembly and update features and information
Claim chapterpass and update features and information
Claim chapterpass and update features and information