I don't really need to use it since I do all of my research beforehand. But it's good to have if you're doing spur of the moment purchases. I can't vouch for accuracy but it wording looks similar to LA website.
They dont have an android app yet but its in development. AquaticLog.com I use the site to log when I changed GFO, Carbon, Water changes, ect. I can be the forgetful type and this helps me keep a chart of when I do what. Hoping for the android app soon.
The only other android app I use is my Apex app.