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Pro Integrates nicely with Google apps
This app is designed to work specifically with Google apps.
Pro Color Coding
It is incredibly helpful to color code queues providing immediate visibility and information. Also, the app can sort tasks in multiple ways and its easy to see and group tasks.
Pro Smart queues are configurable
You have lots of ways to customize smart queues (such as where the tasks should be included from, from which dates etc.).
Con Limited to use with Google apps only
Specifically developed for Google apps.
Con Free version is limited
Full access requires a yearly subscription.