Mirror a fullscreen countdown from your iPhone, iPad, or Mac to an Apple TV or any AirPlay 2-compatible smart TV.
Open castimer.com/timer in Safari on your iPhone, iPad, or Mac and start a countdown. Free, no app needed.
Open the fullscreen display link on the same device and press "F" (Mac) or use the fullscreen button to maximize the big timer view.
On iPhone/iPad: open Control Center → Screen Mirroring → select your Apple TV or AirPlay 2 TV. On Mac: click the Screen Mirroring icon in the menu bar and choose the TV.
The AirPlay icon does not appear
Make sure your Apple device and the TV are on the same Wi-Fi network, and that AirPlay is enabled in the TV settings. Restart both devices if needed.
Mirroring stops by itself
iOS stops mirroring when the device locks or battery drops. Keep your iPhone or iPad plugged into power and set Auto-Lock to "Never" during events.
The timer does not fill the whole TV screen
On iPhone, tap the "AA" button in Safari and choose "Request Desktop Website", then enter fullscreen. On Mac, press "F" on the display screen.
AirPlay video is delayed
Move closer to the router or use a 5 GHz network. For mission-critical sessions, connect the Mac to the TV with an HDMI cable instead.
Apple TV and most modern smart TVs from LG, Samsung, Sony, and Vizio support AirPlay 2. Older TVs can work with an Apple TV box connected via HDMI.
Not natively. Windows users should cast with Chromecast instead — see our Chromecast guide, or connect the laptop to the TV with an HDMI cable.
Screen mirroring ends when the device locks. Keep the screen on and the device charging — or mirror from a Mac, which stays awake.
Yes. AirPlay mirroring is free on every plan. Open the timer, mirror the screen, done.