The Web-based version of HootSuite allows users to manage multiple Twitter accounts, use Twitter lists, schedule tweets in advance, view stats for links shortened with Ow.ly, and more.
These features are also available in the iPhone app, which launched today (December 10).
HootSuite for the iPhone is selling in the App Store for a 33-percent-off price of $1.99 until December 17. At time of writing, it's listed as the top paid social-networking app in both the Canadian and U.S. stores.
On December 1, Invoke won Best Use of Social Media honours at the 2009 Canadian New Media Awards for HootSuite.
The interactive agency launched the Web app in November 2008.
You can follow Stephen Hui on Twitter at twitter.com/stephenhui.