Ever since the iPhone 4S launched last October, owners of other devices – including older iPhones – have been drooling over Siri, the 4S’s integrated voice-activated assistant. The iPhone’s “killer app” has prompted quite a bit of imitation and a few outright ripoffs. At the end of last year we brought you a story about Speerit, an Android app that egregiously copies nearly everything about Siri except the name. At the beginning of this year, a similar app, Siri For Android, was pulled from the App Market. Meanwhile, there are also legitimate apps that offer Siri-like functionality, including at least one for the Windows Phone operating system.

Most of these apps have one thing in common (apart from imitating Siri’s functionality): they are only available for non-iOS phones. To date there are precious few iOS apps that bring Siri-like functionality to non-iPhone 4S devices. Now, however, there is a new app that promises to do just that. Evi is a personal assistant app billed as “revolutionary artificial intelligence here to help with all of your everyday information needs.” Promising plain English search (like Siri), Evi offers to help you look up just about anything. Options include location-based searches, trivia, and a wide array of others.

Evi is available for both iOS and Android. The iOS app is compatible with iPhones, iPads, and iPod Touches running iOS 4.0 or later, however it is not a universal app, which means it will display as an iPhone app when run on the iPad. The Android version is free, while the iOS version is $0.99. Check it out and let us know what you think in the comments.