This means you can add an entry to your calendar on your smartphone and then later review or edit it on your desktop computer or laptop when you’re back at home. At the same time, the best calendar apps will allow you to plan seamlessly across all of your devices with cloud syncing. With our top picks, you can go beyond creating basic timeblocked entries by making reminders, scheduling meetings, and planning out your days, weeks, and months to ensure you're using your time as efficiently as possible.