Bengala
AirPlay vs HDMI for projectors: which one to use
Published October 8, 2026
Short answer. Use HDMI. It has no compression and almost no lag, and it works with any projector that has an HDMI port. Use AirPlay for a quick test, or when you cannot run a cable. AirPlay adds delay and makes the picture softer, which matters most when you are dragging corners and when the effect has dark glows.
An iPhone or iPad can reach a projector two ways. One is a cable. The other is AirPlay screen mirroring over Wi-Fi. Both work with Bengala. They behave differently, so here is what to expect.
HDMI: the wired way
You need two things: an adapter for your phone’s port and a normal HDMI cable.
- iPhone 15 and later, and USB-C iPads: a USB-C to HDMI adapter or cable that carries video. A charging cable does not. Look for “HDMI” and “4K” on the box.
- iPhone 14 and earlier, and older iPads: Apple’s Lightning Digital AV Adapter, or a Lightning to HDMI adapter that is known to work. Cheap unbranded ones are hit and miss.
- A charging port on the adapter is worth paying for. A show runs for hours, and the screen stays on the whole time.
Which adapter goes with which phone, and the ones we would buy, are on the recommended gear page.
Plug it in and the projector shows the picture as soon as you pick the right input. There is no setup on the network side, and nothing to drop out.
For cable length, a plain HDMI cable is reliable up to about 5 meters (15 feet) at 1080p. Longer than that, buy a cable made for it.
AirPlay: the wireless way
You open Control Center, tap Screen Mirroring and pick the projector. That is the whole setup, once the projector supports it.
Most projectors do not support AirPlay. Many cheap ones advertise “wireless casting” or “screen mirroring”, which usually means Miracast or a custom app. Those do not work with an iPhone. Check the spec sheet for the word AirPlay.
There is a fix. An Apple TV plugged into the projector’s HDMI port gives any projector AirPlay, at the price of a box and a power cord.
What you give up with AirPlay
- Lag. The picture arrives a fraction of a second late, often a few tenths. It varies with the Wi-Fi, and it can spike. When you drag a corner the shape trails your finger. For a loop that just plays, nobody notices.
- Compression. AirPlay mirrors the screen as compressed video. Fine detail goes soft, and dark gradients can show banding. A glow fading into black is exactly the case where it shows.
- Dropped frames. A crowded Wi-Fi network, or a phone far from the router, makes motion stutter.
- Phone settings. Your phone has to stay on the same network, awake and in range.
Side by side
| HDMI | AirPlay | |
|---|---|---|
| Lag | Close to none | A few tenths of a second, can spike |
| Picture | Uncompressed | Compressed, softer, banding in dark glows |
| Works with | Any projector with an HDMI input | Only AirPlay receivers, or via an Apple TV |
| Setup | Plug in, pick the input | Control Center, Screen Mirroring |
| Reliability | Steady | Depends on the Wi-Fi |
| Charging | Yes, with a charging port on the adapter | The phone runs on battery unless you plug it in |
| Cost | An adapter and a cable | Nothing, if the projector supports it |
Which one for which job
- A window or a house front for an evening: HDMI. It runs for hours without a hiccup.
- Setting up a shape, dragging corners: HDMI. You need to see the result as it moves.
- A quick look in the living room: AirPlay is fine.
- A projector across the room with no cable in reach: AirPlay, with slow effects.
- A projector behind a window layer: HDMI, with Mirror output on. See the window guide.
If you are stuck with AirPlay
Put the phone and the projector on a 5 GHz Wi-Fi network, keep the phone near the router, close other apps that use the network and pick slower effects. Do the corner work on HDMI if you can, then switch.
In Bengala
Bengala works with both. Over HDMI it finds the projector on its own and shows the resolution at the top of the home screen. With AirPlay, start Screen Mirroring from Control Center first. On Home, tap the projector status at the top to open the Connect sheet. It shows the status either way, and Show test pattern puts a grid on the wall so you can check the picture before you build anything.