The problem with reading from the phone you are filming on is geometry rather than settings. Text has to be a certain size in your field of view to be readable at a glance, and a flattering frame needs the camera at arm’s length or further. Push the camera back and the script shrinks; raise the font and you get four words to a line, so the text scrolls constantly and your eyes visibly track it.
Studios never had this problem, because a studio prompter puts the text on a separate monitor under a sheet of glass in front of the lens. The camera goes wherever the shot needs it. You can do the same thing with a tablet or an old phone: stand it next to the camera, put the script on it, and move the camera back to where the framing actually looks right.
The thing to check in any app that offers this is what happens when the two devices disagree. If each screen scrolls on its own clock they drift apart — imperceptibly at first, and by a line or more over a long take. And if the app stops the script whenever the link between the devices stutters, that interruption is far more disruptive than the drift. Talk2Camera gives both devices the start point and the speed and lets each work out the position itself, so nothing is sent per frame and a dropped link does not stop the script.
Setting it up is a scan: one device shows a pairing code, the other reads it with its camera. The two connect directly to each other rather than through a router, so it works with no Wi-Fi and no signal, and nothing about your script leaves the two devices. One limitation is worth knowing in advance — an iPhone can join a network another device creates but cannot create one itself, so pairing an iPhone camera with an Android tablet away from Wi-Fi means the tablet is the device that shows the code.
