A menu-bar app for macOS
Your Mac plays to one pair of headphones at a time. Tandem sends the same sound to two, three, or more — in step, at whatever volume each person wants.
macOS · $19.99 once · no subscription
- No audio leaves your Mac
- No account, no email
- One-time price
The problem
Your Mac won't share
Plug in a second pair of headphones and macOS picks one. The other person hears nothing. There is no built-in way to play to both — which is the entire reason Tandem exists.
macOS plays to one output at a time — the second pair gets nothing.
Why Tandem
Five things the built‑in method can't do
Small app, one job, done properly.
Pick your headphones
Choose two outputs, or five. Tandem plays to all of them, kept in step.
Get your volume back
One slider that actually moves the sound, instead of the greyed-out one macOS leaves you with.
Balance each pair
Trim each set of headphones on its own, so nobody has to compromise on level.
Trim each pair to taste.
Save a group
Keep tonight's pairing as a preset and bring the whole setup back in a tap.
Add a friend safely
Drop in a guest's headphones for the flight, then remove them when you land.
How it works
Three taps to shared sound
These are live. Try them.
Pick devices
Tap to add two pairs of headphones to the group.
Set the master
Drag one slider — both pairs follow together.
Add a guest
Bring in a third pair for a friend, safely.
Use cases
Made for the people you watch with
Anywhere two people want the same sound and a quiet room.
Private by design
Yours, and only yours
- No audio ever leaves your Mac.
- Nothing captured, nothing sold.
- Cookieless analytics — no personal data, no ad cookies.
The routing never leaves your machine
Tandem moves audio between devices you already own. There is no server in the path, so there is nothing for us — or anyone else — to see.
Early testers
From the people who tried it first
Real quotes from the pre-launch testers. No App Store reviews yet — we'll show those when they exist.
“She had it quiet, I had it loud, same movie, same couch.”
“So easy to use. I had it working in 60 seconds.”
One price, no subscription
One-time purchase on the Mac App Store.
- Every feature, forever
- Free updates
- No account, no email
macOS · $19.99 once · no subscription
Refunds go through Apple, like any Mac app.
Good questions
Ready to share the sound?
One Mac, everyone's headphones, one movie. $19.99, once, and it's yours.
macOS · $19.99 once · no subscription