Similarly, and multiplatforms, I recommend DroidCam (https://www.dev47apps.com/). The interface could use some polish but it works well on android/ios phones to Mac/Windows and Linux.

Similarly, I've used the 'NeuralCam Live' app that also turns an iphone into a webcam. It's free to use, with extra paid options too. The biggest downside is the lack of microphone support, which seems an odd omission.

I think the article is missing the obvious solution: if you can't buy a standalone webcam with as good image/sound quality as a phone, then use/make software that lets you use the phone hardware, there's no need to try to build your own camera.

I recently switched from Droidcam to Filmiic Pro (~$20), and it's pretty good.

Filmic Pro supports clean HDMI out from the rear facing cameras on iPhones and some Android phones. You do need a capture card, but if you have a Camlink or the no-name $20 USB capture card that EposVox did a positive review on, you're good to go.

On Android (I have a P20 Pro), I use a USB-C HDMI dongle meant for a Nintendo Switch, but it works with my phone plus it lets me charge the phone while using it.

Filmic also has a "remote" app (~$3, iirc) so if you have an extra mobile device, you can control the camera app remotely (since the phone you're using as a camera has its screen is pointing away from you).

That's a cool app! Thanks for mentioning it.

I did not realize that Corsair owns Elgato.

Their key light is also a good way to improve lighting.

Worth noting that this won’t work with FaceTime.

Good way to burn your battery.