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Start a side hustle with RoomCast

If you already have a Mac, RoomCast can be the audio tool for a small offering: silent disco nights, overflow sound at events, or clearer audio in a hall. This page maps those jobs to what the app actually does. It does not promise income, and it does not suggest rates.

What can RoomCast do for a small audio offering?

RoomCast is a free, open-source Mac app. It streams live audio from your Mac over the local Wi-Fi to listeners’ phones. Guests scan a QR poster and listen in their phone’s browser on earbuds or headphones they already own — no account needed. The stream stays on the local network; that Wi-Fi does not need internet.

About 50 listeners at once on modern Wi-Fi is typical; it varies with the router, other traffic on the network, walls, and the quality setting. The delay is usually around half a second, even on busy Wi-Fi, which suits talks, dancing and music listening, not lip-sync to a live video screen.

Those limits matter when you talk to a venue. You are offering a Mac, a QR poster, and a phone-based listen path — not a crate of hired headphones, and not a certified hearing-loop install.

Weekend work: silent discos, parties and DJs

Weekend nights are a natural fit. A silent disco (sometimes called a headphone disco) lets everyone dance to the same music in their own ears, so the neighbours hear almost nothing. With RoomCast you can run one without hiring a crate of headphones or radio transmitters: the DJ or playlist plays on a Mac, guests scan the poster, and they listen on earbuds they already own.

The same setup works for a backyard party, school formal, wedding after-party or community night, and for a late party that needs to stay considerate of neighbours and local noise rules. If the music comes from a music app or DJ software, you currently need the free BlackHole 2ch driver so RoomCast can hear that app. It is a one-time setup — do it before the event, not at the door.

Read the walkthroughs: silent disco from your Mac and party till dawn without bothering the neighbours. BlackHole steps live in the music FAQ.

Events and venues

Venues often need sound in a second space without running new speaker cable. Feed a line or USB interface from the mixing desk into the Mac, press Broadcast, and show the QR poster. Guests in overflow seating, a foyer or lobby can listen in the browser. If the side room should have speakers instead of everyone wearing earbuds, a listening laptop or a phone on the listener page can feed a small speaker, including a Bluetooth speaker.

That path covers conference overflow, community halls, and church overflow, cry room or parents’ room audio. Places of worship — churches, mosques, temples, synagogues, gurdwaras and meditation centres — can use the same setup so people follow a service or talk on the phones they already have.

Guides: church overflow and cry room audio, overflow with a Bluetooth speaker, and quiet or sensory room participation.

Daytime work

The same Mac can work during the day, whenever a room needs a clear listen path on phones:

• Quiet or sensory rooms — someone can step out and still follow the talk on earbuds while the side room stays quiet.
• Live translation — an interpreter’s voice can go to phones at a multilingual event, without a tray of receiver kits.
• Classrooms and talks — a teacher or speaker can reach learners on phones when the room PA is hard to hear, or when some people want their own volume.
• Hard of hearing, alongside a loop — guests without a telecoil can listen on phones. RoomCast can supplement a required hearing loop; it does not replace one.

Guides: live translations for multilingual events, hard of hearing without a hearing loop, and hearing loop alternative on people’s own headsets.

Evening work: bingo, trivia and halls

Evening sessions in a hall often fight a tired PA. For bingo or other called numbers, the caller’s microphone can go into the Mac so residents or players hear on their own phones — earbuds, hearing aids that already stream from a phone, or one Bluetooth speaker per table. The same idea suits trivia nights in a community hall when called questions get lost in the room.

Guide: bingo and called numbers in a hall.

What you need

• A Mac running macOS 13 Ventura or later (Apple silicon or Intel).
• The free RoomCast app, downloaded from this site.
• A Wi-Fi router or access point that the Mac and the phones share. That network does not need internet. Guest networks that isolate clients can block phones from reaching the Mac — test this before the day.
• The QR poster RoomCast shows when you broadcast, printed or displayed where people walk in.
• Guests’ own wired or Bluetooth earbuds, plus a small spare bag of cheap wired earphones for anyone who forgets.
• Optionally, the free BlackHole 2ch driver if you will play a music app or DJ software.
• Optionally, a USB interface or mixer feed if you will broadcast a hall microphone or the main-room desk.

You do not need a crate of hired headphones or radio transmitters for the silent-disco path, and listeners do not create an account.

How to pitch it to a venue

Keep the pitch to things you can show on the day. A short demo on the venue’s own Wi-Fi is clearer than a long explanation: Mac, Broadcast, poster, two phones, earbuds in.

• Describe the job in the venue’s words: a silent disco with no headphone hire, overflow sound without new cabling, or clearer called numbers in a hall.
• Show that guests listen in their phone’s browser on headphones they already own, and that they do not need an account.
• Be plain about scale and timing: about 50 listeners on modern Wi-Fi, varying with conditions; delay usually around half a second.
• Offer to test the access point in advance, including any guest-network isolation.
• If music is involved, say that performing rights and streaming-service terms are the venue’s and the event’s responsibility, not something RoomCast grants.
• If hearing access is part of the conversation, say that RoomCast can sit alongside a required loop or other listed system; it is not a legal substitute.
• Leave a link to the matching guide on this site so the venue can read the same steps you will follow.

Whether you treat this as paid work, as part of a DJ set, or as a volunteer skill is up to you. This page does not suggest what to charge and does not promise that a venue will book you.

Things to check before you take a booking

• Music licensing and performing rights. RoomCast only carries sound from your Mac. For public playback, check with your local performing-rights organisation and with the venue about what licence the event needs. This is general information, not legal advice, and this page does not quote fees. If you use Spotify or another streaming service, check that subscription’s terms for public or event playback. See the music licensing FAQ.
• Venue rules and noise rules. A silent-style party still has to follow local noise ordinances, building rules, curfews and any directions from the venue or the police. RoomCast helps keep volume down outside the room; it does not exempt anyone from those rules. See party till dawn.
• Hearing-loop and accessibility requirements. If a building rule or accessibility plan requires a hearing loop, infrared, FM, or another listed system, follow that plan. RoomCast supplements a required loop; it does not replace it. More detail: hearing loop alternatives.
• The network on the day. Test a realistic number of phones on the actual access point. Confirm that phones can reach the Mac, and that people know which Wi-Fi to join before they scan the poster.

Guides to read next

• Silent disco from your Mac
• Party till dawn without bothering the neighbours
• Church overflow and cry room audio
• Overflow with a Bluetooth speaker
• Quiet or sensory room participation
• Live translations for multilingual events
• Bingo and called numbers in a hall
• Hearing loop alternative on people’s own headsets
• User manual · FAQ

Questions about a RoomCast side hustle

More questions? Read the RoomCast FAQ →