Is there any way to define non-literal characters? Meaning sometimes I want to right "-" as a hyphen, not a minus (/,* and so on). I type in "ninth", it thinks it means something; it doesn't. I would like to have a way to let's say right-click and select non-literal.

Nice product - almost ready for the big time in terms of reliability.

- You need to fix the @21:00 to 02:30 = -18:30:00 problem.
- Also need to fix the add 10 and 20 = 1,020 problem.
- sum 10 and 20 = 200 problem
- Need to fix the tiny icon problem
- the text on the options page needs to be a bit bigger (or option to be bigger - smaller windows and bigger window)

Opalcalc I suggest you run a A/B split test the price 7.95 and 9,95 and see how you sales conversion comparies to the $15 price tag.

At $15 this product is too expensive when you take into account all the great FREE calculators that are available and the power built into the Google search / access bar.

At $15 and with the current bugs I would not recommend it to my friends or the students at the university where I teach.

I love you product and what you have done and look forward to fully embracing it when you have the above problems sorted out.

As the developer / promoter of this product you should have been highly interactive with us on this comment section.

This would have won over some powerful fans of your product.

When you interact and tells that the "add 10 and 20 = 1,020" and the "sum 10 and 20 = 200" problem will be fixed in the next release (or even better here is beta version 1.86a to try out now) you build trust and a loyal following.

You did not get our e-mail addresses so we will never know when the patched version come out.

Many of us have tried your software and deemed it a failure due to the bugs highlight above. We will move on and forget about you and your product because we do not whan a $200 or $200,000 error in our calcs. None of us want to look a fool or pay out $200 extra or ask for $200 less due to your programming bugs.

Neat ... at how it already calculated itself before i touch the (=) buttton .

Being that it is made to be portable ..

So.. i've changed the given folder icon to a calculator icon and make it look Real'er ...

All my friends around me seems to be impressed with this ....

OpalCalc Portable 1.86.

Many Thanks Skytopia ... GOTD ... and

Happy Halloween to All here.

When you calculate, you want accuracy and reliable results every time.
So that the output is dependable.
You don't want something that MAY have given you a "wrong" or "unintended" result.
This is why bells and whistles are NOT important in software where reliability is of utmost importance.
Coming back to this software.
It is creative.
But
What most users want is not a zany fancy user interface with a completely NEW syntax and a different way of applying mathematical operators.
You can get crazy stupid results, like how many commenters have demonstrated here.
The most damaging thing is when you Don't Know there has been a mistake; and you rely on the calculation output.
If a calculation software is one where I am always wondering whether it has screwed up the computation, then it has no real world use.
Fanciful user interface is good for showing off once in a while and boasting "my software can do this".
Which is fine, just for kicks.
Don't do anything serious with it.

Quite amazing - thank you very much, does need bigger icons, pleeeeze.
Will it be a free update if you do provide bigger ones?

No, it is NOT portable! Anything requiring .NET cannot be portable. Read the requirements and understand them before publishing otherwise.

Requiring a 500MB bloatware package for a simple calculator does not bespeak of intelligent development.

This is the most creative application I have seen on giveaway. It reminds me of the type of creativity that Visicalc brought to computing many years ago.

time calculations:

@22:15 to 23:00 = 00:45:00 this is ОК
@22:15 to 01:00 = -21:15:00 definitely not nice, at least needs warning

Would be nice to have bigger icons

Interesting multi-bit (multilingual) calculator "Precise Calculator" http://preccalc.sourceforge.net/download.shtml

He also shows the run-time solutions.
So "Precise Calculator" much better calculator "LargeCalic".

Thank you all for your comments, so many new interesting links found.

Add option to use RPN mode. Add plugin for formulas like InfinitySoft PowerOne FE

It's better than traditional "handheld " calculators in a way that you can assign values to variables and then you can change the variable and it will recalculate all the places where you put that variable.

I'm probably the odd one out, but I would love to see options added for inputting equations in Polish notation and reverse Polish notation.

Just opened the calculator and entered a medium complexity problem in formula form. As I knew the answer to the problem, I would know it the calculator understood my entry by the answer it gave. It's answer was correct.

This is a keeper, because unlike the more conventional calculators, you can type your formula and as it is being typed the result updates in real time. Also you can see the entire formula you are writing, and edit parts of it to correct any mistakes. Awesome!

Thanks GOTD and OpalCalc! Will be incorporating this style into some of my science fiction short stories. Bet you never thought it would be used like that!

Started playing with the app for currency and time/date calculations after reading the instructions - and it is AWESOME! Portable is a nice touch. Thanx for this GOTD.

Interesting concept, but has bugs for example
add 30 and 65 yields 3,065. Not ready for prime time, yet

Nice little program! Takes a bit getting used to not having a keyboard layout, like my favorite & much used Moffsoft Calculator, but not only can OpalCalc do much more, it is not an old as dirt program. I will gladly use it!

Thanks OpalCalc & GAOTD.

Nice but if you use Chrome check out Cloudy Calculator, it is an extension always handy. Plus Google has built in functions right in the address bar.

Downloaded and ran on Windows 10 and seems to function when opened. However, there a few issues. Firstly I changed the currency to £ and then when closing I constantly get the errors writing session file and error writing default prefs. and when reopened the currency symbol defaults back to $. Like the concept but if I'm going to get errors every time I use it then nothing to do but get rid of and move on to something else. And yes I did try adjusting the settings but they revert back to the default settings when the program is restarted .. Verdict nice but worthless if it can't retain settings.

Seemed interesting, but I don't get it. I entered "add 10 and 10" which yielded "100". Same result when I said "Sum 10 and 10". "Product of 10 and 10" gave me the answer, "1010".

Using usual algebraic notation such as 10 * 10 works perfectly so then what's the benefit of this program? I am confused.

Download and setup were a snap (Win10 64b), especially considering the small file size even when extracted; and no mega-wrapper this morning!

Being a long-time user of another free calculator I was hesitant to try this because it doesn't have the familiar number pad layout. However it is very easy to get used to this straight-line entry, and the "tape" function I had grown to love is easily replaced here.

As a frequent online shopper, I find that this will come in quite handy as I can assign variable names and change the values without retyping the whole line, and then add up by variable names to get my total. This is important to me as I would tend to forget what I already added and end up redoing the whole thing, and if I wanted to try out a different option I would again have to redo the whole thing. I love this custom variable ability.

And thanks to the portability of this program I was able to put it on a flash drive so that I can use it on my laptop if I need it there.

Thanks, Skytopia, for this excellent program, and thanks to the GOTD team for making this available.

Kalkules does much more for free...

http://www.kalkules.com/

Downloaded and extracted very easily on Windows 10, 64 bit AU. The fact that it is portable is also a huge advantage.

I have been using it most of the morning for a big job I was dreading. Found it to be easy and intuitive to programme and quick and easy results. Very impressed with this and a big 'thank you' to Skytopia and GAOTD. I may well buy it I am that pleased with the morning's work!

Ok well first ya on 4k screen resolution at 3840 x 2160 your 16 x 16 icons are very tiny almost lost. There is no option to increase size. I like the font increase. Now I really tried in fireworks to increase an icon to 64 x 64 and that worked great but the icon didn't change size in portal. So there is something holding it to it's size. Other than that I find it to be a good solid calculator other than dramatic overprice at $15.00 at $5.00 as a student I would consider buying. but usually students get free stuff. So my honest opinion is give it away as foss and you would probably make more money from contributions. There are several thousand free calculators and few good ones that cost money. I am a personal fan of mathmatica online used it through my college algebra and Algebrator currently 9.95 but way different in terms of soving complex algebra. I undersand that what you do is different but not enough that would consider paying 15.00 just saying. Thanks today it is free and I have test run it. and for free it is great I would recomend that everyone try it. kind of cool but very beta and unrefined I see it has a possible future.

I would like to see a mobile touch-based interface that can be activated on tapping an icon. Really useful when you have a hybrid or a 2-in-1 laptop. Thanks. Portable software are always appreciated.

The first calculation I asked it was to sum 10 and 23. The answer I got was 230. Obviously the program does not know how to add. Worthless.

This is actually pretty cool. Haven't messed with it too much, but in the time I have have been impressed by ease of use and actual depth (all the extra functions, real time currency conversion, etc.). As a previous poster noted, the icon bars are pretty tiny, would be nice to have an option on the size. It would also be nice to have a traditional reg/scientific calculator screen option to aid with the transition from a traditional to this new form of calculator.

Who needs it in this day and age
http://www.t1shopper.com/tools/calculate/downloadcalculator.php
https://www.unitjuggler.com/index.html
http://www.calculator.com/
http://www.calculator.net/sitemap.html
https://www.timeanddate.com/
http://www.countcalculate.com/
http://www.metric-conversions.org/

downloaded, no install, executed, deleted, not very friendly

This seems to be interesting and I would love to use it, however for the time being it's practically useless for me, since the icons are exceedingly tiny (and they are the only entry point to the menus).

Is there any way to adjust this ? I have found a way to change font size in Options, but not icon size.

The colour modes do not help either. What is it whith that trend of dark icons on a dark background ? For thousands of years, it has been known that the easiest way to make text readable is by writing black letters (or symbols) on a white background. The human eye and brain have not changed since.

Hello everybody. I just want to write a personal opinion and general comment. We are always looking for the "best" software, me included, but at the end of the day, just in my personal case, I realize that what I need is a "good" software that helps me in my daily issues. So, I am happy if I find that "good" software and can keep on with my daily software needs. I don't know if OpalCalc is the best or not, but I will try it and may be replace the "useful" calculator software I've been using since years ago, that has helped me a lot. Just that. Thanks.

Very nice and versatile calculator, but it can be improved.

For example, there is no way to display precise times: "25 secs / 2 as time" gives the result 00:00:12. It should be 00:00:12.5
Also, it would be nice to be able to enter times in film, PAL, NTSC and NTSC-Film formats, where the decimal part of the seconds represents frames instead of decimals. That would be extremely useful for peoples working in the video industry.
I don't like also the way the binary, octal, decimal and hexadecimal numbers must be entered. For example, "g`10" for hexadecimal 10 is totally absurd. Why not use h`10 for "hexa" 10, or, much better, 0x10 like in (almost) all programming languages?
Also, it would be nice to translate the keywords in other languages, or let the user define aliases for them. For example, "hours" is valid in English, but not in French. It would be nice to be able to type
alias heures hours
alias secondes seconds
alias comme as
and then use "10 heures comme secondes" as a substitute for "10 hours as seconds".
Currently, the English-only keywords are certainly a serious brake for foreign users.

Some little improvements could also be made in the GUI, For example, in the Pi -> Own Functions dropdown list should show the functions sorted alphabetically instead of in the creation order.
Finally, there is a Pi -> Own Stored Variables dropdown list, but I haven't found the way to store my own variables. Something is either missing or not documented and not intuitive at all.

IMO, that calculator is very promising, but there is still much work to do...

Sorry, but I can´t send my comment in the site for improvement feedbacks. So I´ll do it here:

First thanks for giving this prog to us!

I didn´t find a special function yet so here is my idea to improve it :

I would like to get the function for fractionally calculating:
when I type "2/3=6/ " there will be the answer:
"2/3=6/9"

Thank you!
Icho

If it is portable, does that mean that it will work later after a clean OS reinsltallation?

For those who want a simple, free, portable & easy to use calculator - that looks like a conventional calculator.
i.e. you already know how to use it, without the learning curve. Plus a paper tape trial.
ESBcalc - Free & portable

http://www.esbconsult.com/esbcalc/esbcalc.htm

Another great freebie is Moffsoft FreeCalc : http://www.moffsoft.com/freecalc.htm

You can calculate faster than in the interactive python or ruby shell and you can save the output, good calculator.

1. Take collection, about testing a "OpalCalc Portable 1.86", I do not like that you can not do that as a result there were more numbers, without E

2. My favorite versatile calculator "TheCalc 3.02" (http://thecalc.narod.ru/), only the Russian language
"TheCalc 3.02" - The formula calculator, all the basic functions can be switched on / off by pressing the Numlock or hotkey. It supports an unlimited number of user-defined functions, an unlimited number of memory cells. Calculations can occur in the binary system of calculation to 16 hexadecimal, and translates into non-decimal system is not only integral but also fractional numbers. It supports operation with natural fractions.
The "TheCalc" has periodic table (it can be represented in various forms) to output several tens of different data for each chemical element, and there is a "chemical treatment" - the ability to calculate the molecular weight substance, the mass fractions of elements in the material complex equalization

3. Excellent program "Microsoft Mathematics 4.0", did not expect such a high quality product can be from "Microsoft".

4. An interesting program "Geogebra" (free dynamic mathematics program for all levels of education, which includes geometry, algebra, tables, graphs, statistics and arithmetic).
http://www.geogebra.org/manual/en/Main_Page.

//Translated from Russian//

http://www.speqmath.com/index.php?id=1, free, open source, portable.

Nice application works well.
If you miss it today, prefer a freeware or want something that you can re-install and update, you can not go wrong with the free version of CalcTape https://www.schoettler-software.com/en/calctape/windows
Available for Windows, Mac and Mobiles

it will be perfect if it have a colored grid view,
for maximized window it a bit hard to see which result on a lot of calculation

just go look at their site, hella scetchy...

Small. FAST download. Portable - no installation required, just run the .exe file.

Make a shortcut to the .exe file, on your desktop to open it easily, if you like.

Copy the folders and files to a USB flash-drive, make a shortcut of the .exe file on the root, to open easily.

Seems to work well. If you don't like it, just delete all the files and folders. Simplicity.

There may be better ones that are always free. So: this one's free today, it's a keeper for me.