The Twinkle uses a responsive web interface, controlled from a modern web browser on any device. The interface is hosted on the device itself. You connect to it when your device is on the same WiFi network as your Twinkle.
Easily fits in luggage or your pocket and uses standard microUSB cables and plugs you likely already have. No WiFi? No problem! The Twinkle can act ad it's own access point. No power? Just pick up a USB power bank and get going. Sometimes vacations are where you need the most help maintaining routines.
Private
No apps to install or accounts to create
You don't even have to connect it to the Internet! It seems like everything has an app these days. The apps require accounts. Unnecessary cruft and complexity for the benefit of the vendor.