Droid48

- December 20, 2016

Everyone

( 13,773)

Description

Emulator of the HP 48 scientific calculator, using RPN. Port of the X48 project (sources available on github). HP48's "grayscale mode" cannot be emulated.

Visit www.hpcalc.org for a large program collection.

Cool tip: tap the HP's LCD to show/hide a simpler numeric pad !

Reviews

4.5

13,773 total

5 10,202

4 1,936

3 690

2 340

1 605

Chris Casto

The UI on this calculator is the best for the HP experience. After moving up to marshmallow and a 6p the freezing up has started making it unusable. Have reached out to developer but no response yet. UPDATE 3/2017. Developer has resolved issue and I have yet to find any problems. A great app that is very useful and appreciated! Great work!!

Palle Nordestgaard

It simply just works. Not much to add. I still use my old 48GX, but this one follows me around everywhere I go - and just works. Perfect. Update 21/12-2016: Just got the latest update and now it is rather slow in accepting my keypress. Needs to press several times to get it working. Looking forward to the next update, which hopefully fixes the problem. My phone is an older Galaxy S4 mini with Android 4.4.2

A Google User

The Dec 2016 update created less sensitive keystroke entry. I end up having to press at least one key multiple times with every entry. Is there a way to fix that? I find the more rapid flash of the cursor annoying. Used the ap for years and generally love it. Samsung Galaxy S4.

I have a 'Redmi Note 2 Prime' cellphone running Lollipop 5. Droid48 1.61 froze almost immediately. I have been trying out this latest version, Droid48 1.72, for a week now, and it has not frozen at all, and the key responsiveness is fine. If anyone has problems with key responsiveness in Droid48, the following might make a difference: 1) Click on 'Settings' on your cellphone. 2) Find 'Accessibility Options'. 3) Turn off 'Magnification Gestures'.

A Google User

Get this if you want rpn/hp emulator After today's update, buttons are fine but I still see the status bar at the top all the time and it doesn't store the entries after the app exits. Still an awesome app, this is just data for the author. Note 4,6.0.1

Plevrakis Theophilos

HP 48G was one of the Best Scientific Calculators ever build. Both it's function and it's build quality. This app is incredible because it gives you the functionality in the palm of your hand wherever you are. It is also a trip down memory lane for anyone who used that calculator in his/hers student years !!! Good Work !!!

User reviews

Chris Casto March 15, 2017

Palle Nordestgaard December 20, 2016

A Google User December 27, 2016

January 5, 2017

A Google User December 21, 2016

Plevrakis Theophilos May 23, 2017

Walter Grasmick January 12, 2017

Good but lost something... I have used this for a while and has always been great, but latest update caused problems. Like others have said, keypresses are delayed or multiple press to accept. Not sure what is going on, but hopefully will get fixed in next update.

Dave Cox February 2, 2017

Recent update is frustrating to use due to missed keystrokes, despite the haptic feedback firing for each tap. Otherwise a very complete scientific calculator. Switching back to an infix calculator, after using this one for years, has made me realise how natural RPN has become for me.

Aaron Milchiker January 7, 2017

Best thing ever! Thanks for working on this still. I didn't think there would be any more updates, and I was affected by the freezing too. It seems better so far so hopefully the freezing is fixed. This is my favorite app, and I use it all the time!

Bernt Damm January 12, 2017

It worked fine until new update I loved this app and it was great. Yesterday it updated and now it is a disaster. It ignores most buttons when pressed as well as other problems. Pity. I emailed developer but no reply.

Adam Robert February 22, 2017

It was great until the latest round of updates. Now the app doesn't register about half the keystrokes. The phone is clearly registering them since the key highlights and there's a slight vibration so the issue is the app. This is coming off and the go48g app is going on.

mijj mijj December 21, 2016

update got it working again .. further update got it working again. .. orig note => (Galaxy Note 8) Used to be perfect, now no longer even starts (since today's update). Is it possible to get the prev version from somwhere?

A Google User December 21, 2016

Recent update fixed crashing for me! Thanks for putting the old screen back as an option. New users, I recommend using the old bitmap in the settings. The Dec2016 solved the issues I was having when it would crash if I entered data too quickly. Thank you!

Walt Gorczowski December 28, 2016

Used to work This has always been one of my favorite apps, emulating the best calculator ever made. But after the last update, button presses don't register most of the time. I hope it gets fixed.

April 8, 2017

Liking it BUT continuous memory is lost if phone shuts down ... Now have found how to retain memory if phone does shut down. Only complaint so far is that the contrast settings are not active : contrast stays the same at all settings ...

Adrian Wolf December 24, 2016

I just love this app Once I got used to using the Polish notation (20+ years ago while in Engineering) I couldn't see myself using any other calculator. This app lets me carry myself beloved HP48G with me everywhere

January 9, 2017

Matrix multiplication algorithm is incorrect The code in the app that is supposed to perform matrix multiplication is incorrect which renders the app useless. Furthermore, this systematic error will flummox all other matrix operations including eigenanalysis. Would like it to get fixed??? Update: Jan-9-2017 Still broken after new updates.

K Cyrus Robinson January 21, 2017

Not sure what has changed but after years of working smoothly on a Galaxy S4, the app has recently become unreliable. I now have to press keys aggressively since it hesitates and sometimes ignores inputs. I hope it gets fixed soon, I often rely on this emulator.

Seth McElhinney December 20, 2016

Good HP48 emulator Works well, a good emulation. It isn't quite complete but I'm seeing it get closer. The previous version was unstable but it seems stable now.

Frank Roger January 25, 2017

Did have a problem with crashing on Android 6.0, but don't have that problem anymore. Be sure to use Droid 48 Reader which allows you to backup all your programs, directory structure and variables.

Jonathan April 25, 2017

I use this every day and it brings back the experience of the HP 48 - great app. There are a few minor errors in the 48GX skin (not the bitmap) - maybe these can be corrected. I have listed them below in order of the keys on the keyboard: NUM should be ->NUM; nth root of y should be xth root of y; 10^n should be 10^x; y^n should be y^x; e^n should be e^x.

David Shaw December 22, 2016

Use it all the time I paid over $350 for my first HP 45 calculator back in the 70s. I owned at least another 6 different models over the years including a 48. This app makes me feel completely at home with an HP again. Thanks.

Gabriele Bellini December 23, 2016

Missing keystrokes on Samsung S4 Worked flawlessly until latest update. Now it misses key presses and it's now quite unusable. Removing data and program did not solve the issue.

Emmette Cox December 20, 2016

Stopped working but an update a day later fixed it! THANK YOU!!! This is so great! This is my calculator. Used it since college. Thrilled to have it on my phone. Suddenly stopped working.

Julian Gerber February 22, 2017

The latest update has made the app very slow and unresponsive and forced me to go back to a real HP48 for engineering work. Button presses work but must be held in for far longer than before.

Mike Sampson May 6, 2017

Unusable on my 9inch tab s2. Telling what fxn goes with WHat key_yeesh. Shrink the bloody buttons and relayout for tablets or if it's there make it OBVIOUS

Jason Nguyen January 31, 2017

It took a year or so, but the author fixed a lot of the crashing bugs that happened with the s7. Good app for people like me who prefer RPN

Vicente Neto December 20, 2016

Used to be excellent... ...but after updating to v1.72 the calculator became slow and lagging. Doesn't catch the keypresses quickly. Used to be my most useful app.

May 12, 2017

Works great. Wondering if possible to turn of haptic feedback and how to switch colours of layout as shown above.

Daniel Ceballos Quintero June 11, 2017

Wonderful since my old 48g+ wouldn't start again. Once you go RPN, there's no coming back!

Chris Collins January 25, 2017

I have the physical calculator and the worst thing about it that it makes other calculators infuriating to use. This app is great because now I always have my calculator with me. This app has always worked well for me.

David Middleton December 26, 2016

Is absolutely awesome! Latest update gives Black screen. Black screen error FIXED! THANKS. Love this emulator.

April 22, 2017

I have a samsung G6 and I can't save my memory/state when I close the app. I want to save my custom programs and functions but it is useless if I have to reprogram every time I start the app. Can anyone help me please? Thanks

Milton McCarty December 27, 2016

Awesome app My HP48 was a constant companion during my student days. Nice to have with me again, thanks to this app!

Scott Petersen January 13, 2017

Great RPN App! I loved my GX and after only 20yrs it gave up the ghost, blame it on flimsy US based HP engineering. The new versions just aren't the same. This app is a near perfect replacement. My only wish is that tha app kept the stack on exit. THANK YOU ARNAUD!!

Dikran Mahmourian January 29, 2017

Works very well, handy for work and every day life. Nice app for those who were used to the real hp48!

Jose Luis Ochoa Padilla December 21, 2016

Good Emu, bad response It's a nice emulation, but the key response is slow or simply won't register (even after haptic FB).

Johan du Plessis January 5, 2017

Exactly like the real thing. I have a real 48GX and this is exactly the same, just faster at calculations. Great app.

Robert Marcolini March 15, 2017

The apex of RPN calculator for college students, engineers, scientists, mathematician's, chemists! I use it on a daily basis and highly recommended it!