Twain is a powerful To-Do list application that seamlessly integrates with Google Calendar to help you optimize your schedule. With Twain, you can easily add tasks to your To-Do list, specifying their due date and duration, and let the app automatically schedule them in your existing free time slots.

One of the standout features of Twain is its ability to optimize tasks around your existing events. This means that Twain takes into account your calendar events and intelligently schedules tasks in the available free time, ensuring that you make the most of your day.

Twain also offers a range of customization options to suit your preferences. You can set "No-Schedule" hours, choose whether or not to schedule tasks on weekends, select the calendar to create events under, and even specify certain calendars to consider while scheduling. Additionally, you have the option to Force Schedule a task on top of an existing event, giving you more control when needed.

Signing in to Twain is a breeze with Google's easy sign-on process, and the app supports worldwide timezones, making it convenient for users across the globe.

If you're looking for a smart-scheduler that seamlessly integrates with Google Calendar, Twain is definitely worth a try.