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Tydlig - Calculator Reimagined

By Andreas Karlsson

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Calculators have changed very little since the 1970s - while phones from that era look ancient. Why should calculators cling to a 40 year old design with a wall of buttons and one row for results in the age of retina displays? We deserve something better. Tydlig brings the calculator to the next level for iPhone & iPad with innovations like freeform canvas, responsive results and linked numbers.

Tydlig is perfect for calculating everyday things like tips and discounts, showing the entire history and allowing you to change any number with instant updates. For deeper calculations real-time graphing is an excellent way to explore and visualize things like bank interest rates and trigonometric functions.

Inspired by Montessori pedagogy, Tydlig attempts to make math playful and open for experimentation. Being able to drag numbers around and see how graphs change as you use the slider can be a very enlightening way of learning. It reveals the beauty of the relationships between numbers and gives an intuitive feel for math, rather than focusing on the tedious manual labor usually required in class.


* Responsive results: Edit any number on the canvas and see all results update automatically. Let your calculator work for you, not the other way around.

* Linked numbers: With a result selected, press any operation to create a linked number below. Responsive results will cascade down these links.

* All history is stored on an infinite scrolling canvas. Drag numbers around and reuse them as you wish.

* Annotate any number with an attached text label, like a freestyle spreadsheet.

* Real-time graphing: Link numbers to a graph and any change to the expression will instantly update the graph. Perfect when trying to explore how functions work and behave.

* Use the Slider to tweak any number and see results and graphs update in real-time. Combined with the graph it is an excellent way to visualize and teach math. Tap the slider to toggle between discrete and continuous modes.

* Share the entire canvas by printing, or exporting as a high quality PDF. You can also copy calculations as text, or save the visible area as an image which can be used in other applications like Pages or Word.

* Undo support.

* Supports external Bluetooth keyboards for really quick digit and basic operations entry (+, -, *, /).

* Tydlig works completely offline, no need to be connected to the internet.

* Lots of power under the hood with a lightning fast calculation engine, over 20 mathematical functions and scientific notation formatting options.

What's New in Version 1.3.1

* Double tap a number to reset it to 0.
* Bug fixes.

If you like Tydlig, please take the time to give us a nice review: it really helps.


iPhone Screenshot 1
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iPad Screenshot 1
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Customer Reviews

All the good parts of paper and pencil. Nice Job.

Tydig is the most “unique” (as in “unique” = “different and good”) of all the 20 or so calculators I’ve tried (and I have no association with the developer).
In use, Tydig is elegant and has a clean, obvious UI that is easy to use as a “normal” calculator. The cool feature that I like is the ability to drag your numbers around, even pulling a number out of a calculation, and placing it in another calculation, and then pulling THAT result into the original calculation, to do a “what if” calculation. It sounds complicated, but is very much like writing on a piece of paper, and drawing arrows into some other calculation, then erasing part of the original and writing in the result of the second calculation. AND, Tydig shows the slender connecting lines from one calculation to another, so I don’t lose the sense of what I was doing when I moved the numbers around. The edges of the main screen are a little busy (lots of possible settings, options, and places to send the info --currently PDF, print, screenshot--, multiple redos, trig functions, etc, but the main calculator area is open and clean. This developer thought “outside the box”, when I didn’t even notice that I was working in a box. Very Nice Job.

Cute, but lacking in joy to use

Great concept, but the graphing fails in follow-through: if I graph sin(x)=y from y=-1 to 1, the curve is not a perfect beautiful line, but clipped into a half-width line at the extreme points, as the graph truncates to fit a certain number of pixels, not taking into account the chosen width of the whole line itself for the y domain.

Worse, if I use the pan tool to vary x, the live update in the graph doesn't stay snap locked to the curve, but does some kind of ios style animated linear interpolation between last discrete value and current discrete value, taking away the intuitive understanding magic effect of what the x to y relation is, as the visual effect is a grid rectangle bouncing around the curve, only hitting it as you briefly pause and it catches up.

I expect more from this app.

Well well

Tydlig calculator manages to combine a beautiful UI which is fun to use with with equally powerful calculation capabilities. Although it comes with a bit of a learning curve, it is well worth your time. The only thing I have to ask for is easy formula editing capability and the ability to solve for variables. Also, the fact that I need parentheses to square or cube a term in my equation is irritating. I would also like it if we could view answers as fractions or enter our terms in fraction form (appears as typical fraction form on the worksheet). Great Job!

Tydlig - Calculator Reimagined
View In iTunes
This app is designed for both iPhone and iPad
  • $2.99
  • Category: Utilities
  • Updated: Apr 16, 2014
  • Version: 1.3.1
  • Size: 12.5 MB
  • Languages: English, Bokmål, Norwegian, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
  • Seller: Andreas Karlsson

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

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