Trigonometry
Splendid Simulation of a HP-28S
The developer has been implementing most HP28s functions, and the few that are still missing don’t hurt too much (e.g. the ALGEBRA menu, but for this one might be better of with a dedicated CAS system anyway). Only drawback is its name - no one would guess to find a full-fledged HP28 simulator behind something called Halcyon, and also the icon does not hint at its true origins.
So in brief this is highly recommended to any HP enthusiast. The original HP28 layout with the separate alphanumeric keypad makes it very easy to use. It runs natively and makes full use of the iOs graphics display and resolution to its advantage (gestures, copy, paste, scrolling etc).
I had the hp28s. This is a good replica
Cons: free version is too locked down to tell how well it works. I would have like to tried out other features, but that requires at least 1 upgrade possibly more. I could not tell for sure. I would pass on this one since I cannot tell how well it will work.
Response from developer
I appreciate the feedback and I am sorry you found the free version locked down. But I am wondering if perhaps there is a different problem. The free version is fully featured and I believe is quite functional without purchasing extra features. There are in-app purchases which unlock the following: - A larger display which also removes in-app advertisement banners - Unit conversion so you can convert feet to meters or any number of other units, including units you define yourself. - Programming support so you can create your own custom actions and operations. - The ability to create directories to store your own symbols in a hierarchical tree. Those are the only restrictions in the free version. You can do basic calculations with real numbers, integers, complex numbers, vectors and matrices. You can enter equations, plot them, perform calculus on them, evaluate them for various values of variables. Perhaps you were having a technical issue with the app which was preventing it from working for you and I am more than happy to work with you on that and help you to resolve it.
HP 28S Calculator Replica
Love the HP 28S
Crap on a Stick😡
Response from developer
I completely agree that this calculator is complicated and I am sorry that you did not find it useful. The app is definitely not for everyone and one goal is to try to capture a bit of nostalgia for some of the high-end scientific calculators of the 1990's while also being a highly functional tool for those who want something like that on iOS. I suspect your algebra teacher is exactly the kind of person who is interested in something like that and it would appear that you are not. Fair enough and I hope you found a calculator which was more to your liking.
bbye!
deleting.
Response from developer
With every new version of iOS, I need to make a decision about what the minimum version of iOS I will support. I generally try to support two. The most recent version and the previous. I am responding to your review long after you posted it but today, the latest version is iOS 11. I plan to ship a couple of update to the app in the iOS 11 timeframe and plan to support both iOS 11 and iOS 10. When iOS 12 comes out, I will be focusing on iOS 12 and iOS 11. Time I spend testing old version of the OS on old hardware is time that I could spend working on adding more features to the app. I do need to make a tradeoff between these two and I am sorry that you found that tradeoff to be a problem for you.
