Light control apps for iphone?

I was wondering if there were any iphone apps available that can control your lights, tv etc and to use them you DON't need to buy some sort off device to go with it. Maybe the app could use the model numbers of things or something:/

Yes there are but you need a microcontroller which you can control through your iPhone. Just app is not enough. Check keywords "arduino, iphone, remote". You can even do urself

No.

The apps need to connect to some hardware that somehow connects to the network.

Some smart TVs and other home media devices that do connect to the Internet or other outside data network may have apps to control them from a phone/tablet.

But for simple lamps or appliances, you need a controller for each that connects to the Internet directly, or to an intermediate network which has a gateway that connects the intermedite network to the Internet, or them made to connect to the Internet directly.

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