Macworld.com – Among the major Internet services that tragically have lacked a native iPad app is Tumblr, a blogging service that William Porter liked in our Macworld review. Sure, thereâs a native Tumblr iPhone app, and Tumblrâs Website is acceptable in Mobile Safari. But now thereâs Tumbleroo from Hanso Group, the first native iPad client that can satiate your Tumblr reading and blogging addiction.