AtMail Open vs One Calendar

A side-by-side look at AtMail Open and One Calendar. For an in-depth review of either product, follow the links below.

AtMail Open

Office & Productivity

AtMail Open is an open source email server software designed for high delivery performance, security, and reliability. It is based on open standards and is a scalable on-prem email platform for SMBs.

emailserveropen-source

Full review → Alternatives

One Calendar

Office & Productivity

One Calendar is a free calendar app that allows you to manage all of your calendars and events in one place. It pulls in your Google, Outlook, and iCloud calendars, as well as your tasks, so you can view everything together. Key features include calendar management, event creation, reminders, and access across devices.

calendareventsreminderstaskscrossplatform

Full review → Alternatives