Boomerang — UX'n over the top. Boomerang folds Cartoon Network, Looney Tunes and Hanna-Barbera into a single streaming subscription. (I know, hot-diggity.) Available as native and Web apps, the UX encompasses dozens of micro and macro strategies — from messaging to paywall. Curious World. Stream, read, play. What makes Curious World a satisfying subscription app? Kids get a balanced…