What’s New

Version 1.5

* Updated for iOS 11 and iPhone X
* Fixes the dreaded "bouncing text" bug

Ratings and Reviews

4.2 out of 5
61 Ratings

61 Ratings

dotHTM ,

My go-to app for calculations now.

Calca is my favorite Math program.

The developer's responsiveness on Twitter is amazing.

It has quickly replaced Pacific Tech's Graphing Calculator as my go-to back-of-envelope estimation tool. Soulver never lived long on my Mac or iPhone as the "running total" quickly got on my nerves as being often highly out of context, even for their example support files.

I love how straight-forward Calca is in it's definition of functions and output. I love how well it handles and resolves physical units (so long as unit definitions are declared early).

In a few cases when I got a spinning-beach-ball after mistakenly entering a very large calculation, I just force-quit, and when relaunched, I was only a minute change from recreating my working file again, even though I'd never manually saved the new "untitled" file.

I really appreciate it using built-in OS X document features like auto-saving and iCloud. In hindsight Calca feels more valuable than the price in the Mac and iOS App Stores. If the developer ever releases a paid-upgrade, I will happily be one of his first repeat customers.

MasPollo ,

What an app!

Great calculator mixed with a Markdown text editor?!? Can life get any better?
Honestly though, I've been using this app since it came out for the Mac and iOS, and it's just fabulous. I happily paid for both, but I completely understand the developer's need to make money and try this new approach. I'm just glad that it's still in active development.
Now having graphs on the iPhone is great, and I LOVE the dark mode!
The holy grail would be a way to handle tabular data in a multi markdown table!

DamnableNook ,

Wanted to love it, but implementation disappoints

I love the idea and design of this app. Combining Markdown and Mathematica/Wolfram Alpha presses all the right buttons for me. As soon as I read the app description, I needed it in my life. I was ready to donate before even downloading it.

However, once I downloaded the app, I found it... lacking. The idea is great, but the app is buggy/"quirky". I find myself fighting with the interface, tapping on something over and over to get it to register the right action. The Markdown syntax extensions for doing calculations sounds great, but the app makes it hard to enter the correct equations, and get the desired result.

Even the built-in example notebooks, which should showcase the app's features, don't completely work (one notebook, for instance, uses an undefined variable, causing it to fail to run).

Overall, the quirks and bugs make the app more frustrating to use than not. For now, I'm sticking with Tydlig for interactive, explanatory calculations, and will copy+paste results into my Markdown editor if I need to write up text.


Krueger Systems, Inc.
35.8 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.

Age Rating
Rated 4+
© 2013-2018 Krueger Systems, Inc.
In-App Purchases
  1. 12-Month Optional Patronage $7.99
  2. 6-Month Optional Patronage $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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