Agile / Lean Project Management.
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Pro Simple & clean interface
Design focuses on clarity.
Pro Slack integration
An update is posted to the Slack channel every time a task is created, completed, moved, or commented upon.
Con No free plan
There is no free plan like for personal use and the minimal cost of $19/month might be prohibitive.
Con Slack integration is really basic
There is no way to interact with tasks in any way - new tasks can't be added, completed tasks can't be removed, tasks can't be assigned, etc. The integration only sends updates to the Slack channel. There is also no way to fine-tune what updates get posted to Slack.