Credits

All audio is decoded, analysed, retuned and exported inside your browser. No file is uploaded, and the app collects no analytics and sets no cookies. A Content Security Policy forbids the pages from connecting to any other address.

Free software, GNU GPL v2 or later

Copyright © 2026 Retune 432.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version. It is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License.

Source code: this site serves the app's own unminified source files. Repository: github.com/personalassistancetool-afk/retune-432.

Rubber Band Library 3.3.0

Copyright 2007–2022 Particular Programs Ltd. GNU GPL version 2 or later. breakfastquay.com/rubberband. WebAssembly build from rubberband-wasm by Dani Biró (GPLv2). License · Corresponding source.

Helvetica Neue · Arimo

Helvetica Neue is used only when installed on your device and is not distributed with this app. Arimo, the fallback, is copyright The Arimo Project Authors, under the SIL Open Font License 1.1: license.