StumbleUpon, for those of you who do not already know this, is an internet community that aids fellow internauts find all sorts of web pages, according to their various interests. It is a discovery engine if you will, a discovery engine that will show you new sites based on your preferences and recommendations from millions of other StumbleUpon users who have the same interests and passions as you do.

The development team at StumbleUpon has announced the release of the StumbleUpon app for Apple’s iPhone and Google’s Android operating system (Android 2.1 and 2.2). Version 1.0 of the app is available for download free of charge. The app is available in just one language – English.

“Following the success of our iPad app, we're excited to extend the stumbling experience to iPhone and Android device users, letting people explore the best of the web at any time no matter where they are," said Garrett Camp, founder and CEO of StumbleUpon. "Downloading the app is easy and once logged-in, users can discover great online content that's tailored to their preferences."

You could of course access StumbleUpon from the iPhone’s browser – that is an option. But the simple truth of the matter is that the app is far better than this option. The app has been specifically designed for mobile browsing; the site on the other hand has not.

Here is what the app lets you do and what it does not let you do:
- Log into your StumbleUpon account and all of your StumbleUpon preferences will be loaded automatically.
- Easily find sites according to your preferences.
- Skip to the next random site from the conveniently located toolbar.
- A stumbling mode that displays only thumbnails of web site (great for slow connections).
- Rate sites that you encounter by taping the thumbs up or the thumbs down icon.
- You cannot edit your StumbleUpon profile from within the app
- You can’t interact with your StumbleUpon contacts from the app.