I optimized the website for mobile phones first, so it should work really well on any phone. At the moment you still need an internet connection to use it, so it's true that there would be some advantage to having a mobile app. I don't think I'll make a mobile version for now, but instead I'll modify the web page to make it usable even when you're offline once saved to your device. That should make it almost indistinguishable from using an actual mobile app.
Just deployed a new version that can be installed into your Android or iOS device like an app, and then used even when you have no internet access. To do that: iOS Navigate to site and refresh Tap "Share" Tap "Add to home screen" Android Navigate to site and refresh Tap the "vertical elipsis" or "More" button Tap "Install app"