We do not have a mobile app, but Speak & Improve, which is a web app, works on all devices. You can use it on your laptop, desktop, smartphone or tablet, and if you create a profile (it's free!), all your work will be saved and you will see it on all your devices.
Did you know, you can create a shortcut to Speak & Improve on your smartphone or tablet home screen so that you can open it with just one touch, like a mobile app? For Android devices, just open speakandimprove.com in your device's browser, then touch on the menu, and choose 'Add to Home Screen'. On iPhone, iPad etc., go to Speak & Improve, then touch the Share button on your browser’s toolbar — it's a rectangle with an arrow pointing up. It’s at the top of the screen on an iPad, and at the bottom of the screen on an iPhone or iPod Touch. Choose the 'Add to Home Screen' icon in the Share menu. Now you can open Speak & Improve with just one touch."
Here you will find the best browser to use on your device:
Safari is the only browser that works well with Speak & Improve on iOS
Firefox and Chrome will not work with Speak & Improve on iOS
Chrome is the only browser that works well with Speak & Improve on Android devices
Firefox will not work with Speak & Improve on Android devices