Unfolded
Room for the whole reference page.
Keep the brief, the chat or the docs open on the Duo, and the Mac screen stays free for the work.
Built for iPhone Duo Works on every iPhone
Unfold a second
screen for your Mac.
SidePane turns iPhone Duo, or any iPhone, into an extended Mac display. Over the cable or Wi-Fi, with touch and Apple Pencil support.
Two apps, both free to try: one makes the display on your Mac, the other shows it on your iPhone.
From your pocket to a second screen.
The Duo opens beside a Mac, takes a window, folds, and signs a contract with Apple Pencil.
A second screen wherever your laptop goes.
Your Duo is already in your pocket. Open it beside your MacBook at a café, on a train or in a hotel room, and keep what you're reading next to what you're writing.
Tent mode
Sign it where it stands.
Stand the Duo up beside your laptop, open the contract on it and sign with Apple Pencil.
Your Mac, with a touchscreen and a pen.
Things that are fiddly with a trackpad take seconds on the Duo.
- Sign a contract
- Open the PDF in Preview on the Duo, sign it with Apple Pencil and send it straight back.
- Mark up a screenshot
- Circle the bug or sketch the layout right on it, in any Mac app.
- Jot a note by hand
- Write it with the Pencil and SidePane types it on your Mac.
- Read with your fingers
- Swipe through a long document and tap what you see, with the gestures you know from a trackpad.
Plug in at your desk. Wander on Wi-Fi.
The cable gives the smoothest picture, up to 120 frames a second. Unplug to take the Duo to the meeting room and SidePane carries on over Wi-Fi, with your windows where you left them.
Set up in two minutes.
macOS sees a new monitor named after your iPhone, so you drag windows onto it like any other.
- Install on your Mac. Open SidePane and allow Screen Recording. It's how SidePane sends the picture, straight to your iPhone and nowhere else. Allow Accessibility too for touch and Pencil.
- Install on your iPhone. Get SidePane from the App Store. It finds your Mac on the cable or the same Wi-Fi.
- Plug in once. Click Allow on the Mac to pair. After that your iPhone connects by itself.
Free to try. Pay once to keep going.
No subscription and no account.
Free
$0
The Mac app, and the iPhone app with 15-minute sessions, as many as you like.
Unlock
$9.99 once
No time limit, on every iPhone with your Apple Account. Family Sharing included.
Questions
Can't find your answer? Read Support or email me.
Can I use my iPhone as a second monitor for my Mac?
Yes. Install the free SidePane app on your Mac and SidePane on your iPhone. Your Mac gets a real extended display: drag any window onto the iPhone, and tap, scroll or draw on it.
Which Macs work?
Macs with Apple silicon (M1 or later) running macOS 15 or later. Intel Macs aren't supported.
Which iPhones work?
Any iPhone running iOS 18 or later. SidePane is designed for iPhone Duo's inner and cover screens, and works on every other iPhone too.
Does SidePane use both iPhone Duo screens?
Yes. The Mac display follows whichever screen you use, inner or cover, and resizes when you fold or rotate. Each screen remembers its own text size.
Does it work over USB or Wi-Fi?
Both. Over the USB cable you get the lowest delay and up to 120 frames a second; on the same Wi-Fi up to 60. If you unplug, SidePane carries on over Wi-Fi. USB keeps working with Chrome or Brave open.
Is SidePane a subscription?
No. The Mac app is free. The iPhone app is free with 15-minute sessions, as many as you like. A one-time US$9.99 unlock removes the time limit, and Family Sharing is included.
Is the picture encrypted?
No. Only paired iPhones can connect, but the picture isn't encrypted. On public Wi-Fi, turn off Use Wi-Fi and connect with the USB cable.
Why isn't the Mac app on the Mac App Store?
Making a new display needs a macOS feature the Mac App Store doesn't allow, so SidePane for Mac is a direct download, signed and notarized by Apple, and it updates itself.
Try it on your Duo today.
Install SidePane on your Mac and your iPhone. Free for 15 minutes at a time, as often as you like, and $9.99 once to keep going.
Macs with Apple silicon on macOS 15 or later. iPhones with iOS 18 or later.