My little calculator app turns 15!
15 years ago, I released a little calculator app called Calculus doodlus. The first version went live on September 23, 2011.
I'm still working on it. 😄
Version 3.0 was recently released, and it brings two features I've wanted to add for a long time: Edit and Link.
A - Answer
Calculus doodlus is a calculator designed around the way you actually work with calculations.
Instead of replacing your previous calculation every time you press =, your calculations stay on the page. You can scroll back, see what you did, and reuse previous values.
And after all these years, it still has the handwritten look that people have loved about the app.
B - Better
Edit: Long-press any calculation to go back and change it. The calculation is recalculated while keeping the rest of the page intact.
Link: Tap a calculation or result to reuse its value in another calculation. If the original value changes later, linked calculations update automatically.
There are also pages for organizing calculations, √, support for very large numbers, sharing a calculation page as an image, and Lock Screen / Control Center features.
But the basic idea hasn't changed in 15 years: a friendly calculator that keeps your calculations around instead of making them disappear.
C - Cost
Calculus doodlus is free to download and supported by advertising.
If you'd rather use it without ads, there's an optional subscription for €3.99/year, with Family Sharing included.
No account required.
I'd love to hear what you think, especially if you've tried other calculators with a persistent calculation history. What would make you switch to something like this?