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I have been looking for a truly powerful calculator for a long time. I've tried variations of the HP top of the line and several were very nice but as I said in one of the other reviews that calculator emulators are great for what they are but the idea is to serve your needs. If a calculator still retains all of the disadvantages of the original then it is not an advancement. This calculator not only provides all the capabilities of the HP that inspired it but also eliminates many of the physical calculator's cons. Ever had a calculator that did everything you needed and more but required a book and a lot of memory work to do any of the sophisticated things? This one does not have that drawback. There is context based help available at the touch of a button. Now you can actually use the full power of the calculator without it becoming a research project. To me, that essentially made the more advanced the calculator the less useful it became. Not so here. I applaud the developer. We don't need exact replicas of calculators, we need something to do a job with the least effort on our part. This is a giant step in that direction. On top of that, the developer continues to add additional enhancements without resorting to “forever pay”. This is truly a rare gem. Calculators are not sacred but my time is. Get this. You won't regret it. Now I can get on with my work!

I haven’t had a chance to evaluate the whole app yet (therefore only 4 stars—sorry!) but it seems to function so much like the ti calculators that if someone needs to switch between this and one of ti‘s graphing calcs, it wouldn’t result in much getting used to at all. That is a HUGE plus. Students can practice with this App and then be better prepared when they are limited to an actual calculator for school or taking the SAT or some other testing purposes. I find it absolutely excellent that students can have access to a calculator like this without having to pay over $100 for an insanely cost prohibitive calculator that is only really worth about $15-$20, if that. After 20 years in math education, I could say so much about that racket but will refrain.

This is such a great app to use instead of a super expensive graphing calculator. I recommend it every year to my students. It’s fabulous for those on-the-spot study sessions at the coffee shop when you have forgotten your calculator. Many of my students have switched to it as their primary calculator. The functions are the same and the control over graph zooming is a simple pinch method. To identify mínima and máxima you just slide your finger over the graph until the color changes. no left and right bounding required. As an instructor, I use it with my iPad and OneNote during lecture. My lecture notes are projected to the overhead screen as I write them in OneNotes. When I need to demonstrate a concept on the calculator I slip it out by swiping left and a small version of the calculator is overlaid on my notes. When I am done, a swipe right allows me to return to only the notes screen. Students are able to watch my key strokes in real time.