"iTumblr" has been renamed to "Lucis" (Latin, meaning light)

The most elegant third-party Tumblr Client.

Note: A Tumblr account is required.

Features:
◉ No Ads
◉ Download Video & Photos
◉ Browse recommended tumblrs
◉ Browse dashboard
◉ Browse pure photos or videos
◉ Browse likes
◉ Like / Unlike
◉ Search stuff
◉ Follow / Unfollow
◉ Repost
◉ Multiple accounts supported
◉ Touch ID for each accounts
◉ 3D Touch shortcuts

Note:
Lucis is a third-party Tumblr client created by Tumblr API. But it's not an official app and not affiliated to the publishers or developers of "Tumblr".