Imagine your iPhone spitting out a paper tape as you burn through multiple calculations. Sounds crazy right? That’s how we used to calculate though. Truthfully there is something to be said for the old paper trail of calculations. You can go back and see your history anytime. Unfortunately as soon as you clear your current calculations using the iPhone calculator they’re gone. Not so with Tydlig. Tydlig brings the best of both worlds without you having to replace the paper. Instead, Tydlig keeps a running history of your calculations on screen. Want to see a formula you punched in yesterday? Just scroll up and there it is. You can even go back and edit previous strings of digits. Or use old summations in new equations. Its like using paper all over again minus all the ink and bulk of a standalone calculator.

Tydlig is just one of our favorite productivity apps for iPhone and iPad. We’ve collected all of our favorites here. And if you’d like to see more of our top app selections in different categories, just head on over to our Best Apps Series.

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Here are a couple of our other picks of the best productivity apps for iPhone and iPad:

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