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About

UnderPeaks is a developer-first headless CMS that generates production-ready Flutter and Next.js applications from a single content model. Founders define their data model once, and UnderPeaks generates real, readable source code for both a mobile app and a web app from that same schema. The platform supports five database backends — Supabase, PostgreSQL, MySQL, MongoDB, and Firebase — through a unified adapter layer, avoiding vendor lock-in. UnderPeaks is available as UnderPeaks Core, a free, open-source, self-hosted option, and as UnderPeaks Studio, a managed hosted platform. UnderPeaks is built by a solo founder based in George, South Africa, for developers and agencies building both mobile and web applications from the same underlying data.

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 Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android 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, self-hosters, indie hackers, small dev agencies, open-source enthusiasts, comapnies , freealancers

Audience

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

Support

Phone Support Supported
24/7 Live Support Not Supported
Online 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

$18/month
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 Supported
Live Online Supported
In Person Not Supported

Training

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

Company Information

UnderPeaks
Founded: 2026
South Africa
underpeaks.com

Company Information

chapterpass
Founded: 2026
Italy
chapterpass.com

Alternatives

Alternatives

Euphona

Euphona

SOGV2 Limited
TekMindz

TekMindz

Samin TekMindz
Loudness

Loudness

Loudness.fm

Categories

Headless CMS Supported

Categories

Audio Mastering Supported

Integrations

Resend Supported

Integrations

Resend Not Supported
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Claim UnderPeaks and update features and information
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