Control from your phone or laptop while the timer shows fullscreen on any big screen. Choose your casting method below.
When everyone can see the same timer, your presentations stay on track and your events run smoothly.
Keep speakers on schedule. The audience sees the remaining time at a glance while you control it from your phone.
A large, visible countdown keeps the show flowing. No more running over time or rushing through segments.
Manage quizzes, breaks, and group activities. Students always know how much time they have left.
The easiest way to display your timer on a Chromecast-connected TV. Works with the Chrome browser on any computer.
Go to the Castimer viewer page on your Chrome browser. This link opens a fullscreen-friendly timer display.
Right-click anywhere on the page and select "Cast…" from the context menu. Or click the three-dot menu > Cast.
Choose the device you want to cast to. The timer will appear fullscreen on your TV within seconds.
Perfect for Apple users. If you have a Mac or iPhone paired with an Apple TV or AirPlay 2-compatible smart TV, mirroring takes just two taps.
Make sure your Mac and the AirPlay receiver (Apple TV or smart TV) are on the same Wi-Fi network.
Click the Control Center icon in the menu bar, then click Screen Mirroring.
Select your TV or Apple TV from the list. The Castimer viewer page will appear on the big screen.
Open Control Center by swiping down from the top-right corner.
Tap Screen Mirroring and select your AirPlay device.
Open the Castimer viewer link in Safari. The fullscreen timer will display on your TV.
The most reliable option. HDMI gives you a rock-solid, lag-free display — ideal for conferences and live events where Wi-Fi may be unreliable.
Plug an HDMI cable from your laptop to the display device.
Go to Display Settings and choose "Extend" mode. This lets you keep your control panel on your laptop while the timer fills the big screen.
Drag the Castimer viewer tab to the external display and press F11 for fullscreen. Control the timer from your laptop.
Always do a quick test to confirm the timer is visible and the colors look good on the big screen.
No special app needed. The Castimer viewer works in every major browser, so you can cast from any device.
Recommended for Cast
Works with AirPlay
Chromium-based
Full support
From a 10-inch tablet to an 80-inch TV, Castimer automatically adjusts the layout, font size, and spacing so the timer is always crisp and readable.
Full HD, 4K, and beyond — the flip timer scales beautifully.
Conference rooms and auditoriums love the high-contrast display.
HDMI or network display — just open the viewer link.
Use as a secondary viewer when you need mobility.
Quick answers to common questions about casting your timer.
No. Castimer is entirely web-based. Open the viewer link in your browser and use your browser's built-in cast or screen mirroring feature.
Yes. The timer is fully remote-controlled. Set it up on your phone or laptop, then open the viewer link on the TV. Start, pause, and reset from your device.
For critical events, HDMI is the most stable option since it doesn't depend on Wi-Fi. For convenience, Chromecast or AirPlay work great with a good network.
Yes, the viewer is completely free. Open the link on any screen — no signup or subscription required.
Set up takes 30 seconds. No signup, no app download — just open the viewer and start displaying.