Tweetie 2 is so far ahead of every other iPhone Twitter app, it's astounding.
It's the most polished Twitter app yet, oozing slickness with every swipe. Yet, it's exploding with new features, and still really fast. It manages to cram in every possible feature you could possibly want in a Twitter app—offline reading!—without feeling too complicated or bloated. Truthfully, it's a brand new, totally different app from the original, down to the core. If you already own Tweetie and don't buy Tweetie 2 because you feel like you shouldn't have to spend another $3, Alyssa Milano, it's your loss.
The main Tweetie 2 interface feels just like the original—awesome—with two big differences: The chat bubbles are dead, replaced by a solid stream of tweets, and glowing notification orbs tell you when new tweets, mentions or direct messages are waiting for you. That's a huge functional leap over the original Tweetie, where you had to click over to each section to see if you had new messages. Plus, the orbs just look cool, like they're cut off by the bottom of the screen. The one flaw here is that sometimes it doesn't register you've read a message, so you'll wind up clearing the orb for the same message twice.
How do you refresh? When you hit the top of a timeline and keep pulling down, an arrow pops into sight that tells you to pull down, and as you down, it smoothly spins upward, telling you to release to refresh. It's simple, but slick. There's also a search bar up there, so you can look through all the tweets you have pulled up for something that caught your eye.
The greatest new feature in Tweetie 2 is its offline powers. They're great. Not only does it cache tweets to read offline, but you have other Twitter capabilities, like adding favorites, which are synced up the next time you go back online. A basic drafts manager lets you store and edit tweets to send later.
You can set up virtual push notifications so you can see whenever somebody you follow drops a Tweet bomb, like RealTracyMorgan. (They show up as a text message from 40404, i.e., Twitter.) Sadly, this doesn't extend to @replies, but it's for following a particular person (or persons, if you want a lot of messages about tweets). Other new functional awesomeness includes auto-complete for @replying and direct messaging people who have confusing-ass usernames you can't remember (though you have to go to the user, and then compose a message to them), the ability to link people with address cards, a very pretty nearby tweet search, and integration with multiple services like Instapaper and Tweet Blocker.
If you've never paid for a Twitter app or even if you have, Tweetie 2 is well worth the measly three bucks it costs. It's fast, it's got full offline powers and it's so polished your iPhone will slip out of your hand while you're using it. It's not perfect, but it's the closest yet.
Super smooth UI, gushing with polish and animations
Exceptionally good offline powers
Feature-packed without feeling bloated
No real syncing with desktop app