For the first time nearly a decade, I’ve found myself tempted to return to Windows. But there’s still one problem: the app gap. While Windows now offers many of my favorite apps, there are a few of the best Mac apps left that I use every day that keep me from fully embracing Windows. One of my favorite app makers is Readdle, which makes the popular Spark Mailbox desktop app. I formerly used Spark — until I started paying for Superhuman . But I still use one Readdle app every...