Starred credits

Shipped in this project

SharpVox

• Repo: dectalk/SharpVoxTTS
• Author: ByteSizedFox (dectalk org)
• License: MIT
• Used for: every voice on the site: the formant (Klatt-style) speech engine, compiled to WebAssembly
• Notice: Copyright (c) 2026 ByteSizedFox. Full text in licenses/SharpVoxTTS-MIT.txt. Changed files listed in NOTICE.

MIT License

Copyright (c) 2026 ByteSizedFox

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Linked and credited only

The classic voices that inspired the jukebox. Their engines are proprietary or have no open license, so they are linked here, not copied.

smoothTalker-sbaitso

• Repo: joshknnd1982/smoothTalker-sbaitso
• License: MIT for the NVDA add-on code
• Why it is not shipped: The real Dr. Sbaitso / First Byte SmoothTalker voice. It works by running the original 1990 DOS engine file under a CPU emulator. That engine is not open source, so it can't be shipped here.

softvoice-sapi5

• Repo: joshknnd1982/softvoice-sapi5
• License: MIT for the wrapper code
• Why it is not shipped: The real 1997 SoftVoice voices for Windows. The engine itself is the original SoftVoice DLL files, which are not open source, so they can't be shipped here.

DECtalk

• Repo: dectalk/dectalk
• License: No standard license GitHub can read
• Why it is not shipped: Modern builds of the classic DECtalk. Linked only.

DECtalkMini

• Repo: dectalk/DECtalkMini
• License: No license
• Why it is not shipped: A portable DECtalk. Linked only.

DECtalk 4.63 source

• Repo: dectalk/463
• License: No license
• Why it is not shipped: Linked only.

Lintalker

• Repo: dectalk/lintalker
• License: No license
• Why it is not shipped: Another synthesizer from the same group. Linked only.

DECTalkApple

• Repo: masonasons/DECTalkApple
• License: No license
• Why it is not shipped: DECtalk as a Mac and iPhone system voice. Linked only.

eSpeak NG

• Repo: espeak-ng/espeak-ng
• License: GPL-3.0
• Why it is not shipped: A great open source engine. Using it would make the whole jukebox GPL, so this version leaves it out. Could be added later as a GPL build.

NVSpeechPlayer

• Repo: nvaccess/NVSpeechPlayer
• License: No license file GitHub can read
• Why it is not shipped: A Klatt-based engine from NV Access. Linked only.

retro-tts-pack

• Repo: devinprater/retro-tts-pack
• License: No license
• Why it is not shipped: Retro synthesizers for Linux. Linked only.

alexclassic

• Repo: 2three1y/alexclassic
• License: MIT
• Why it is not shipped: My own project preserving the classic Mac Alex voice. It has no engine code yet.

Not in the stars

No JavaScript port of SAM (Software Automatic Mouth) is in the starred list, so SAM is not here.

This project

Retro Voice Jukebox is MIT licensed, by Carter (2three1y). The effects and page are original. Source on GitHub.