[znpy]

Trello recently implemented power-ups, that basically foil most of the advantages of Zenkit.

My personal rant: I wish Trello would take better care of its api. The REST endpoints all work great, but examples are very, very basic and languages other than javascript are basically ignored.

[sororke]

True, however you're limited to using only one powerup a free user, or 3 as a gold member. Things that count as power ups in Trello, like custom fields & the calendar, are standard in Zenkit and available to all users... Zenkit will also release an API to enable connections to other apps, just as Trello does.