Old faithful
I think I've had this app for a few years now. It's strength is what it's not trying to do. Its got the basic calculator functions, but not trying to be a true scientific calculator. If you truly needed to graph a function you'd use your chunky Ti. This fits the everyday calculations, with the occasional heavier calculations that require exponents or squaring. And most importantly, it addresses the biggest gripe I have with the default calculator; the lack of history. With this I can run a dozen smaller operations and grab the figures I need from the past as I go. And it performs all this in a very slick, minimal interface that I genuinely enjoy using. I'm writing this review because I've finally moved on from iOS and this app doesn't seem to be on the Android store. It's a bittersweet goodbye. You've set the standard high here.