Thaumic Cast

Cast tab audio to Sonos over your local network. Self-hosted, fast, private. Requires the Thaumic Cast desktop app or server.

As of June 2026, Thaumic Cast has 99 users in the Productivity category.

Usersup 125.0 percent+125.0%
99
99
Ratingno change0%
— reviews
Reviewsno change0%
Version
0.12.0
Manifest V3
90-day change · In the last 90 days this extension 1 version update.

History

11 snapshots

Tracking since Apr 1, 2026.

103.471.539.6Apr 1, 2026Jun 7, 2026
View as table
DateUsersRatingReviewsVersion
Apr 1, 2026440.11.0
Apr 8, 2026500.11.0
Apr 19, 2026530.11.0
Apr 25, 2026570.11.0
May 2, 2026660.12.0
May 9, 2026710.12.0
May 13, 2026850.12.0
May 19, 2026780.12.0
May 25, 2026870.12.0
Jun 1, 2026890.12.0
Jun 7, 2026830.12.0
Now990.12.0

Permissions & access

Permissions
tabCaptureoffscreenstorageactiveTabpower
Host access
http://localhost/*

Screenshots

Thaumic Cast screenshot 1Thaumic Cast screenshot 2Thaumic Cast screenshot 3

About

Thaumic Cast streams audio from a browser tab to your Sonos speakers over your local network. It is self-hosted, which means it runs on your machine and stays on your network. No accounts. No cloud. Just sound going where you told it to.

This extension is one half of the system:
   - The extension captures audio from a browser tab.
   - The Thaumic Cast Desktop app (or headless server) running on the same computer receives it and streams it to Sonos.

Getting started:
   1. Download and run the Thaumic Cast Desktop app (or headless server) from the latest release:
      https://github.com/brew-lab/thaumic-cast/releases/latest
   2. Install this extension.
   3. Click the extension, pick a Sonos group, and start streaming.

Notes:
   - The extension connects to your local Thaumic Cast server on http://localhost:49400 (it may use ports 49400 to 49410).
   - If you use a firewall, allow 49400 to 49410 over TCP.

Permissions:
   - Tab capture: required to capture audio from the tab you choose.
   - Tabs: required to identify and manage the tab you are streaming.
   - Storage: saves settings like your preferred server port.
   - Power: helps keep streaming stable during long playback.
   - Host access to localhost: used to talk to the local Thaumic Cast companion app.

Project and support:
https://github.com/brew-lab/thaumic-cast

Trademark note:
Sonos is a trademark of Sonos, Inc. This project is not affiliated with Sonos.

Technical

Version
0.12.0
Manifest
V3
Size
190KiB
Min Chrome
88
Languages
1
Featured
No

Metadata

ID
hpemmkbecklfacogdidaoncjmfadgedm
Developer ID
uec781d2385c283499ac410eb871c211c
Developer Email
[email protected]
Created
Jan 25, 2026
Last Updated (Store)
Apr 21, 2026
Last Scraped
Jun 7, 2026
Website

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Data sourced from the Chrome Web Store · last verified Jun 7, 2026.