Pixel 8, 8a etc and later Pixels are shipped with the ability to connect an external monitor (finally). You can just plug in a usbc to hdmi and plug in a monitor, or you can plug the usbc into a dock or hub (note some do but most don't come with an audio out but do push audio through the hdmi) and connect the hub to the monitor. No software required. GrapheneOS same, no software required. However, you might have to long press the Pixel's screen and go into options and turn on rotate desktop. You might also have to go into Dev options and

"Enable Key Desktop Features"

Go to Settings > System > Developer options.

Scroll down to the "App compatibility" or "Drawing" sections.

Look for and enable the following flags:

Force desktop mode (This enables the basic desktop environment.)

Enable freeform windows on secondary display (This is crucial, as it tells the system to use the external screen as a separate display with resizable windows, rather than just mirroring.)

PIXEL 7 OR EARLIER (that don't have the hardware built into them to stream, ie chipset)

Use a hub that has ‘DisplayLink’ (company) that makes the graphics chip that allows the phone to stream to a monitor.

https://www.youtube.com/watch?v=UJ4hzT7It2o&t=509s

An example product that I think probably works

"HDMI Adapter USB Type C Cable 4K MHL Converter Cord w/Charging Port for TV Projector Monitor Connet Samsu…"

But for sure the adapter requires a graphics chip in. Renkship and Maylowen make them.

Install the app called Displaylink presenter (which is just a driver basically, you don't need to launch it, it just is installed).

NOTE

Mouse doesn't work on external monitor. Streaming like Netflix is encrypted and will just show as black on the external.

PIXEL 3 (same thing as above)

Display link certified adapter.

https://www.youtube.com/watch?v=Yz8cr3vXKM4

ANY PHONE RUNNING ANDROID 14.4 or later

https://www.youtube.com/watch?v=44-jXexQ8Kk Tested out the Moto G Fast, Samsung A01, and the Alldocube iplay40 in this video.

2-in-1 USB Type C/Micro USB to HDMI Cable adapter (chip with 128mb ram).

He says you can send audio through bluetooth from the phone to the unit to pipe it into the monitor through the hdmi.

This uses MiraPlug Mirrorcast app. So who knows trustworthy.

OTHER PHONES

Samsung S8 and later, S21 (earlier I think also?), plug and play.