This app was mentioned in 6 comments, with an average of 4.33 upvotes
You inspired me to look at the website. Looks like a meaningless corporate splash page with a lot of buzzwords that doesn't actually say anything.
The Play Store link is more helpful though. It's an app that interfaces with Arduinos and other microcontrollers. You can use to create interfaces to easily interact with them e.g. smart home profile to work with DIY smart devices.
https://play.google.com/store/apps/details?id=cc.blynk
This andriod app is a really easy way to do what you want. You don't have to worry about coding the web interface etc. Just need to wire the transmitters and then select the proper pins in the app.
I briefly glanced at Blynk in the Play app store a few days ago, no idea if it would suit your purpose though.