(They all obviously work with Apple's iCloud Calendars as well, barring one unusual exception.) But any of the apps on this list sync with Google Calendar to bring you the best of both worlds. Let me start with this: there's no Google Calendar app for Mac. For more details on our process, read the full rundown of how we select apps to feature on the Zapier blog. We're never paid for placement in our articles from any app or for links to any site-we value the trust readers put in us to offer authentic evaluations of the categories and apps we review. We spend dozens of hours researching and testing apps, using each app as it's intended to be used and evaluating it against the criteria we set for the category. All of our best apps roundups are written by humans who've spent much of their careers using, testing, and writing about software.