Calca

Calc is pretty much all the good things in one. It lets you enter equations, solves them algebraically, handles graphing, is super flexible and free-form to the point where you think, document, and calculate all at once.

Depuis une récente mise à jour, l'app ne fonctionne plus. Le développeur contacté n'a pas répondu. J'ai dû basculer sur une feuille de calcul dans Apple Numbers. Dommage, Calca était bien pratique.

I’ve used Calca for years on iOS and Mac, and I love it for all sorts of computation. The most recent update with iOS 18 support fixes some issues I’ve hit with iPad Pro and Magic Keyboards—I really appreciate it!

I first got Calca when it originally came out (and way before I did for real 🥲), over 10 years ago. I was in college and I had an iPhone 4s, I think. It had apps, most of them not very useful. Calca was *something else*. Calca could do math, and Calca made it convenient to do math that involved more than just punching in two numbers to get a single result. No longer did I need to break out a spreadsheet (which are still awkward on a phone, even in 2024, even on our now massive smartphone screens). I could calculate the rent split for my college roommates. I could calculate the total cost of a trip for me and my friends, with a bunch of flight tickets, accommodations, and whatever else, with the total cost split between all of us. I could estimate fuel costs given the fuel efficiency of a car. I could calculate means, standard deviations, and other arbitrary statistics on some data I was thinking about (don't you hate not having an app on your phone for figuring out stats for some random piece of data?). I could plot things. And I could annotate it all with Markdown, which I had then only just discovered. All on my phone. It was probably the first app I ever got on my phone that made it very real that this thing I always have on me is actually a legit computer, and having a computer that is always on me is actually useful. (Except for when it's the opposite of useful, but that's not Calca's fault). Calca is not perfect. Over the years, I have encountered a fair amount of weird behavior, and anything really-really complex can still be awkward and error-prone. Calca's unit-aware calculations, while really cool, have also sometimes caused bizarre results. But when it has worked — and most of the time, it has — it has been magical. I only have weird behavior to complain about because I still come back to it and use it, a decade and who knows how many smartphone generations later. I wont deny that I'd appreciate it if the developer came back to this app to give it some love. But also... I get it. 11 years is a *long* time, and I only paid for Calca once (that was nice, by the way, to be able to pay for an app just once, and have it keep working for over a decade). Even if it's flawed, even if it's maybe abandoned, even if I now have a full-blown Python interpreter on my phone, with a whole host of numerical computation and data analysis libraries (imagine that, college me from 11 years ago), I still keep coming back to Calca. If I could give Calca 6 stars, or 11, or a usize::MAX, I would. If I could pay for it again, (and then maybe a third time), just to say "thank you," I would. It doesn't have to be perfect to be one of the best.

This app is unique and there is nothing else quite like it. I use it in place of Excel when multiple calculations are required along with extensive text. That said, it’s been several years since it’s been updated so I’m concerned the developer may have abandoned the project. Calca is among my core apps so I’d be open to a subscription offering to compensate the developer and ensure it remains sustainable.

I have been using this for dinner time as a math scratchpad. It is really useful for doing rapid calculations while stock trading. The product would be greatly enhanced if it could handle date calculations. For example of I wanted to know the number of days between two dates or the third Monday of June in 2020 etc.

Smidigt på alla nivån. Använder ofta i vardags situationer. Chess

It’s like a mini-Mathematica! Very well designed, integrated in Apple envs and as far as I use it (weekly), it is bug free. Congratulations!

This is a mathematical sketch pad that tackles the toughest problems with aplomb. If you like bc on your computer this is much more fun and powerful. Like a spreadsheet it recalculates dynamically. Unlike a spreadsheet calculations are clearly visible, especially when they are complex.