Droid48

- September 21, 2014

Everyone

Productivity

Offers in-app purchases

( 12,959)

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

12,959 total

5 9,634

4 1,842

3 647

2 302

1 522

A Google User

Simply the best calc app! Great emulator for one of the best calculators made during my college years ...HP48g. Thank you so much. Im really thrilled to be able to carry this app around in my cell phone. Update: Freezes up constantly on Nexus 5. Hopefully the developer will find a solution for this. At least for replacement there's also the droid48sx app that resembles this app a lot and is very stable on most Android versions.

Dave Olander

Land surveyor loves it I bought a 48sx in 1991and a GX a while later. The SX is gone and the GX started losing the screen several years ago and the 48 series stopped production long before. I found this app right away. I don't use a calculator as much as I used to, so this kept me from having to learn a new one. I haven't tested the programmability, but it does my simple calc's just fine. I came back to donate.

Hans-Peter Oeri

HP48 rules - don't forget to donate! The physical calculator was the best - at its time. And this app rules, too. Only suboptimal point: even on large tablets, it expands keys and display to the whole screen. Everything is very(!) large in this case and still looks compressed. A different layout for big screens would be great.

Robert G

like it's the real thing.... but better!! Since the mid nineties, using the HP48Gx - now on the Android, superb... the only thing needed to make this emulator true-to-life is an increase in the size of physical device its installed on - the Samsung Note series is almost there... but think they have to build an 8.3 inch phablet with comperable screen size to do so. just have to wait I suppose. this app is like having the original in-pocket - perfect. no other emulator comes close...

Terry M

Used to work great on my HTC Worked perfectly on my HTC1, loved it! When I loaded it on my new Samsung s6 Active thru ATT it started freezing up. I can open the app and get about 10-15 seconds into typing an equation and it freezes. I close the app and try again only to have the same reaults, every time! Please fix this!

Kristina Bengtsson

Very excited I found this app when I was searching for a reverse calculator. When I saw it, I was so excited. I installed it. I have been happily calculating ever since. My original HP48GX has lines running through the screen and I have missed it so much. I tried to donate but I received an error: "The item you requested is not available for purchase." I will keep trying to give you some money until it works. Thank you, thank you, thank you for making this app. I am thrilled everyday. Smiles all around. Warmest regards, Kristina.

User reviews

A Google User November 22, 2014

Dave Olander March 21, 2016

Hans-Peter Oeri December 24, 2014

Robert G October 3, 2014

Terry M September 16, 2015

Kristina Bengtsson March 13, 2015

A Google User May 11, 2015

Best app of all! THE APP KEEPS STALLING EVERY TIME I TRY TO USE IT. PLEASE WILL YOU FIX THIS PROBLEM? .This is truely the most valuable app on my tablet. A GREAT BIG thank you! For creating this app. This must be the most LEGENDARY calculator ever created. Many Thanks! MB James.

Iñaki López Corral February 23, 2015

Owner of the previous generation HP 15C HP calculators are second to none. I still use my old HP 15C and this emulator has allowed me to discover the wonderful next generation that came in the 90s. RPL is wonderful, same as having the stack in full view on display. I also use an emulator of the 15C but the 48G is so much better that I don't use my good old HP15C anymore. The only drawback is the haptic feedback being too weak, it would be great to be able to adjust haptic duration or strenght. It would also be great an HP 50G emulator!!!

D Krouse December 29, 2014

I never enjoyed HP RPN until this app. Using this app allows users to experience the benefits of using HP RPN. However, I have some trouble using it on my Samsung Galaxy Tab 10.5 - occasionally locks up. And developer might consider removing the calculator 'OFF' button as it causes problems and is not needed.

A Google User February 15, 2016

I use this app every day and it is the best thing since sliced bread. Edit: It pains me to say that the app has serious stability issues after upgrading to Marshmallow on my Nexus 6P. The app will become completely unresponsive at seemingly random moments and I am forced to force close. This can be frustrating if you have invested a lot of time in a particular calculation only to have to start over again. If the stability options can be fixed I will certainly be back.

Seth Henry February 6, 2015

Good emulation, needs some debugging I love my old HP48GX, but I find I use this almost as much because my phone is always with me. Unfortunately, it seems to have regressed a bit lately. It is keeping the phone awake, even after you close it. I have had it drain battery unknowingly due to this until I saw it at the top of the list in wake lock detector. I can work around it, but this is a potential problem.

Anthony Taylor January 22, 2015

My favorite app Many years ago, my HP48 was my prize possession. This app is the next best thing to being there. Addendum: I've upgraded my phone to a Nexus 6, which runs Android 5. There seems to be an issue somewhere between the new run-time and this program, as Droid 48 frequently freezes during key entry. It worked flawlessly on my old S3, though.

Caleb T January 28, 2016

My favorite for RPN, but a little buggy. I use this calculator more frequently than my 50g, and for a long time this app was very solid. More recently, however, the "LCD" portion of the calculator will go black and it won't change back. I have to uninstall the app and then reinstall it to get things back to normal. Here's hoping for a fix, and thanks for the app.

Thomas Ries May 10, 2015

Great calculator app but freezes often Unfortunately starting with Android 5 I experience *very* frequent freezes (within a few minutes of starting the app). If this issue can be fixed then I consider this the best calculator APP for Android (being a "legacy" HP48GX user from earlier times and I still have one in my desk). Please fix the freeze (I'm willing to test new releases/betas).

Stephen Parks June 16, 2016

Hangs App hangs every time I use it, so it's useless (S7 Edge). And why the cheesy keyboard? Just try m48 on iOS to see what a 48G emulator should be. m48 looks and acts just like a real 48G, except not so slow. Actually, you can even set it to work at the speed of the real calculator if you want.

Marco Rizzardo November 22, 2014

HP RPN cals were the best I still think the RPN system, is the best way to do cals. I had one at uni and used it extensively until it was stolen (if you read this you can still give it back, please). This app is almost like the real thing, the only thing it is missing is the feeling of a real HP keyboard.

A Google User January 16, 2016

Excellent! The only way to super geek your phone. All my programs from the real calculator work fine. Tried on a Kindle fire and SGS3. Update: Not working too well on my htc one m8. Crashing lots - hope we can get this great program up and running again. Not working on my htc one m9 as well. So want this to work...

John Efekodo January 6, 2016

Problem O! Well, this just goes to show the various initial attempts at getting a logical working process on a calc. I use TI-89. Have gotten Round the logic. This HP 48 really has some funky logic to entering equation. It makes you feel like an English person learning Chinese. Everything is just different. I can hardly believe that HP actually made this. The Emulator emulates what HP made. So kudos to the app developer.... I'll go have a word with HP...

Miguel González Cuadrado September 27, 2014

Awesome... ... just like the HP48 (any model) is the most awesome abacus produced by civilization. If you've never used RPN, open your mind, give it a try, and overcome the initial unfamiliarity. I assure you it'll definitely be worth it.

Don Sundberg February 26, 2015

Screen is blank and doesn't appear to respond Recently it fails to work. Comes up and gives me a dark blank screen. I really liked it when it worked though hopefully they get it fixed. Uninstall / reinstall seems to have reset what was wrong. There should be a easier way to reset it though.

A Google User March 2, 2015

Love the app, but is starting to lock up. Love the app. Locks up on my HTC One M8, though. Fast becoming unusable. I am forced to "Force Stop" it, which forces me to set it up again. But setting it up always seems to LOCK it up, and there I go again. Very frustrating. I even tried uninstalling and re-installing...to no avail. Please fix!

Brian McCain September 12, 2016

Good but crashes all the time Used this app for a while now without issues. Only thing i disliked was that if the screen rotated it cleared everything. But something happened in the last month. I can't get through adding 4 numbers now without the app locking up. Adding 7 numbers and it froze 3 times. So unfortunately am deleting it and finding something new.

A Google User June 16, 2016

Excellent no more Worked just like my old calculator! But not anymore. Freezes and has to be reset every couple of calculations. Super frustrating to attempt to use. Might just uninstall. Sad to lose the HP48.

Chris Casto July 24, 2016

Freezing on Nexus 6p 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.

A Google User March 26, 2015

Once fantastic, now not so much. Don't know what has happened, but this has started freezing so often that I can't use it anymore and I've had to switch to a competing program. Fix the freezes and I'll be back cause this was awesome when it worked

Robin Kelly December 23, 2015

Used to love it This calculator used to be great. But as of the latest upgrade the application crashes every 5 minutes I use it. Can't believe what a ridiculous thing they did to this great app. Don't waste your time it sucks

A Google User December 3, 2015

When it works, it is the best RPN calculator for android. The problem is that is locks up almost immediately. This happened with my Note 3 and is even worse with my new Nexux 6P. Please fix.

Kyle Larsen August 9, 2016

Use to work well I hate to rate this so low, but it crashes way too frequently to be useful (Nexus 5X). Hopefully, the developer can get it back to where it use to be.

A Google User June 3, 2015

Freezes all the time Freezes after a couple of operations on Nexus 6 and 9 making it useless. Use to be a great app but seems the developer is no longer working on it. Shame..

A Google User April 12, 2016

Very nice! An annoying bug though One bug, or maybe a setting that I'm missing? When you rotate from portrait to landscape on my LG G3, it dumps everything on the stack :( other than that, it's just as good as my busted up old hp 48g!

Joao Veiga November 21, 2015

I just love this app. I had freezing problems on lollipop (nexus 5), but but seems ok on marshmallow so far. Edit: Talked too early. Still freezes on android 6.0. It's sad, bc it's the best calc out there.

Kevin Henry April 14, 2015

Great when it works Love the app other than the fact that it freezes all the time. Once the memory is cleared or the app is reinstalled it's works again for a while. It's a very handy app when it works. It needs an update or something to fix problems that make me hunt periodically for a different app that has the equation library and solver because I'm tired of typing in my equations over and over again when I have to clear the memory. (Galaxy S5)

A Google User January 21, 2015

Freezes constantly on Nexus 5 I sure wish this app worked because the HP48 is the best engineering calculator around. The app is almost guaranteed to freeze after 10 calculations. It also freezes the same on my old Samsung Epic 4G.

Russ Knize May 27, 2015

Long time user. I've been using this app since 2009. There is something comforting about the old HP. The emulation has a few bugs, but has become much more usable as screen sizes have increased. Donated.

Bill Louise July 25, 2016

Doesn't work on a nexus 6P I used this app for a few years on my HTC M7. It was great and always worked. When I upgraded to my Nexus 6P it started freezing randomly. Can't use it once it freezes. Too bad, it is a great calculator. I hope they fix it.

A Google User February 28, 2016

Used to be great, used to love this emulator of my long time favorite calculator. However, over the last few updates the stability has become complete crap. I've waited and waited for it to get fixed but it only got worse. It crashes every single time I use it!! Time to uninstall.

David Hains December 15, 2015

Crash problem is fixed! 12/2025 12/14/2015 Update. New update to Android seems to have fixed the crashing issue. I'm very pleased. This was my most important app but didn't work on Galaxy S6 with Android 5.1. Latest OS update to 5.1.1 seems to have fixed it.

Tim Allen October 26, 2015

My default calculator It is because of this calculator that I was the worst mathematician...in the physics department. I still have my old HP it just sits in a glass cabinet now.

A Google User February 17, 2016

February 2016...still freezing to the point of being useless... This app is no longer usable in it's current state after updating to Android 5.0.2. Constant freezing and losing stack contents when screen rotates has destroyed the usability of this once great app. Goodbye droid48. Back to the actual HP 48G I was trying to replace.

Mr E Man June 25, 2015

Memory Clears on rotate I love the app, but the stack clears when I lay down my Android. Turns out the "rotate screen" clears all the stack. Annoying to loose all my calculations from just laying my Android down. Can you fix it?