Appcelerator Titanium Mobile Platforms: iPhone and Android What you need to get started: Software installed from the site Feature set: 4/5 | Difficulty: 5/5 | Reach: 5/5 To use Appcelerator Titanium Mobile, you need to be familiar with Web languages like Python, HTML and Javascript. That said, you will not need to know specific programming languages typically required to develop apps for the iPhone and Android. All you do is build the app using Web languages, and Titanium does the rest. You will need to download the iPhone SDK (which is Mac-only) if you plan to make iPhone apps. This development platform doesn't come with any tutorials - you will have to rely on the goodwill of the community and learn how to use the tools through knowledge posted on forums. There are also paid services that provide support and automation during the app-making process. If you know how to wield the tools correctly, Titanium can offer more features than App Inventor for Android. But there are limitations to being a third-party development platform - the latest features in iOS and Android OS are not guaranteed to work here. Verdict: If you are open to teaching yourself app development as a hobby, the versatile Appcelerator Titanium Mobile is a great way to start. The faint of heart need not apply.