Day-O is described as 'simple menu bar clock replacement with a simple calendar for your Mac. Which uses strftime style customisation' and is an app in the Office & Productivity category. There are more than 10 alternatives to Day-O for a variety of platforms, including Mac, iPhone, iPad, Apple Watch and Android Tablet. The best alternative is Itsycal, which is both free and Open Source. Other great apps like Day-O are Fantastical (Paid), Calendar 366 (Paid), Dato (Paid) and InstaCal (Paid).
Itsycal is a tiny menu bar calendar. If you want, it will display your events as a companion to the Mac Calendar app. Itsycal has Dark Mode, ISO week numbers, a customizable system clock replacement, and more.
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Itsycal vs Day-O opinions
pros, cons and recent comments
Identical functionality as Day-O plus more and works perfectly with macOS Sierra.
Fantastical is a flexible calendar with natural language event creation, a beautiful calendar and event list, support for CalDAV (including Google Calendar delegates) automatic alarms, and instant searching.
Appointments and reminders, meetings and deadlines, birthdays and dates - make the most of your time with Calendar 366 II! Anything a calendar can do, Calendar 366 II can do better - and all functions can be adjusted easily and intuitively.
Dato is a replacement for the system menu bar clock. By default, it looks exactly the same, but when you click it, you get a small calendar, calendar events, the current time in various time zones, and more.
InstaCal is an affordable, yet powerful calendar app that puts all your events right at your fingertips, always available in your Mac's menu bar. InstaCal is quick and convenient, and can be opened at any time with a configurable keyboard shortcut.
GroupCal redefines the way calendars work. It introduces a whole new way to create and manage shared calendars between groups of people. Each shared calendar holds events for a specific topic, such as - family, friends, and co-workers.