Yep, all similar though. None of these apps would have access to the iPhone's file sysyem to run like the anti-virus systems on computers. Apple doesn't permit access to the necessary API's, on non-jailbroken iphones, to do so. Of course, this is also one of the reasons why such programs are unnecessary, on non-jailbroken iPhones, and why there are no knowm viruses that affect iOS devices, that are not jailbroken.
Provided your iPhone is not jailbreaked you are very safe.
The iPhone does not install Adobe Flash or run Java in the web browser- Removing the transfer route and risk of the vast majority of infections.
Mail client is sandboxed and MS Office Macros can't run or be opened in any app.
PDF and JPEG images are also sandboxed.
Finally since you can not modify Safari with tool bars and other toys Malware infection risks are difficult.
All apps are installed via an Apple approved process distributed via a controlled store.
Apple have a good record of removing from sale/distribution those that are found to pose a risk or have stability issues.
Via the SDK Apple also controls what tools and access privileges App developers can deploy.
Bluetooth file transfer protocols are disabled.
Apple has done an extensive job of locking down and insulating ios from dangers at this time.
The only anoyances are iAds that Apple allow to be built into "free" and even paid for apps and are especially prevalent in games.
At this stage third party antivius software is little more than scareware being unnecessary and possibly damaging.