Spark on iOS was one of those transformative applications that really improved the way people worked and interacted with their mail. Offering a clean and intuitive design as well as great mail management tools made it a better option that the onboard Mail app. Spark is one of those free apps that users would be happy to pay good money for.
The best news is that Spark is now available for macOS. Not only is this reimagined for use on notebooks and desktops, it is also compatible with the Touchbar on newer MacBook Pros. Check it out here.