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No. The music plays locally on each device through that person's own YouTube Music. The server only syncs playback state — track, position, whether it's playing, plus a timestamp — so no audio is ever redistributed. That's why there are no copyright or bandwidth burdens.

Yes. Every participant needs access to YouTube Music on their own device. Hummo only sends sync signals so that everyone plays the same track at the same position.

• The host is the sync reference. If things drift, the host can press play/pause once more to realign the position.
• The extension performs automatic timestamp-based drift correction. On high-latency networks, small differences may remain.
• Make sure the YouTube Music tab is active and in the foreground.

Free supports up to 3 people per room. Upgrading to Pro ($2.99/month) unlocks unlimited (4 or more) simultaneous listeners.

Payment is handled by Stripe (via lavela). You can cancel the subscription anytime; on cancellation your Pro access stays active until the end of the current billing period, after which auto-renewal stops. For details, see the Terms of Service.

Public rooms are isolated by UI language. That means you only see rooms from users who speak the same language as you (en/ko/ja). You can change the sort order by most-loved, most listeners, or newest.

• Shared queue: room members can add tracks and reorder them. The shuffle toggle turns random playback on and off.
• Add this page: on a YouTube Music playlist page, press the button to bulk-add that page's tracks to the queue.

You can add friends by nickname or one-way follow anyone. When someone you follow opens a room, a badge notification appears on the extension icon.

Three languages are supported: English (en), Korean (ko), and Japanese (ja).

Send account-deletion or data access/deletion requests to the contact email below. Full handling details are in the Privacy Policy.