Casbu is an email alternative that allows anyone to quickly and elegantly make decisions, visualize message priority and pause communication without missing time-sensitive information.

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Sort Messages by Urgency

Intuitive color grading lets you know when questions need answers.

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Control Subjects

Concise subjects reflect the actual content of questions.

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Manage Contacts

Set who can contact you, and about what.

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Set Limits

Limit your hours of contact without worrying: time-sensitive information will still get through.