we are in the process of switching over to Swiftkanban as the kanban board is great to use and allows us to create end to end workflow.
We will more than likely continue to use AHA for strategy but ideally we are looking for a single solution that covers all.
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Aha! already includes a kanban board, but you must enable it in your Navigation settings. Please see this support article for help and more details: http://support.aha.io/hc/en-us/articles/204964125