Spark has long been one of the best and most popular third-party email apps. Its developer, Readdle, managed to build a tool that is clean, fast, and simple in a market where very few apps check all three of those boxes. It works across multiple platforms, handles multiple accounts with ease, and is free for practically everyone.
But Spark’s new app, which is available now for Mac (though the App Store version is still behind), Windows (for the first time), iOS, and Android, takes a…
