Reviewers describe Google Calendar as a dependable daily tool that keeps meetings, deadlines, reminders, and personal plans in one place. They repeatedly praise its simple, clean interface, syncing across devices, email notifications, color-coding, multiple calendars, and reminders for managing work and personal life. The main criticism is minor: task-list colors feel limited compared with event customization. Founder feedback is sparse but aligns with users, with the makers of readywhen and Sunrise highlighting its broad adoption and easy sharing across teams and devices.