Antinote is a smart notepad with Markdown, autocomplete, calculations, currency conversion, and timers. One-week trial, $5 license.
How often do you have to open a full-fledged text editor just to jot something down quickly? Or launch a calculator to do a simple computation? Probably quite often.
I often face the same thing — needing to make a “throwaway” note that I’ll delete a minute later. For people like us, there’s a great app called Antinote, which at first glance simply lets you create a note and write something in it.

But behind this simple facade lies a wealth of useful features. Even from the screenshot above, you can see that the app supports Markdown formatting and quick text-processing functions: grammar checking, changing lowercase to uppercase, and similar tools.
The thing is, all the other features are accessible through contextual commands. For example, typing the command math followed by a mathematical expression makes Antinote automatically perform the calculation.
Similarly, it supports currency and unit conversion, variables, Pomodoro timers, and much more.
Meanwhile, lists, tasks, and links are automatically formatted as you type.
Pricing
You can try Antinote for free for one week. A license costs $5.