NatsuLion is a simple (or simplistic) Twitter app for Mac OS X.

Features:

• Display timeline
• Post a message
• Create a favorite
• Replies including messages contain @ are emphasized
• Input support for “@<ID>”
• Growl Notifications (replies are notified with a higher priority and stickied by default)
• Manage unread tweets

The Good:

NatsuLion is a basic desktop app for using Twitter, and it accomplishes its limited goals quite well. Graphics are good and the Growl notifications are a nice feature. For those who are interested, NatsuLion’s website offers a link to its source code. Of note, there is a version of NatsuLion for the iPhone®, available at the App Store for free (our comments for the desktop version apply to the iPhone® version too).

The Not-so-Good:

As we mentioned, NatsuLion does its job well, but its job is rather limited in scope. Also, the supporting info on the website appears to be in Japanglish (can’t really blame them, these guys are from Japan after all), and that can be either very amusing or very frustrating, depending on the time of day.

Tweetwave.com rates it: ♦♦