As we noted in our coverage of Appcelerator’s mobile developer survey last week, for lots of developers, a singular development target just isn’t enough, with many developers expressing interest in making apps for both Apple’s iOS and for Android. Today, the guys at AppStoreHQ put together a comprehensive report detailing just how many developers have apps for both platforms.

AppStoreHQ scoured its developer directory and cross-checked developers for the Android Market against developers for Apple’s App Store. The data shows that hundreds of developers – big and small – aren’t betting on just one platform and are targeting both iOS and Android users.

According to AppStoreHQ’s research, 1412 developers in its database have published apps for both iOS and for Android. That ends up breaking down to 15% of Android developers and 3% of iOS developers. Check out this venn diagram:

Alright, but what types of companies are making apps for both platforms? Well, AppStoreHQ pulled out some of the big names, namely Gameloft, Facebook, PayPal, Yelp and Amazon, but plenty of other developers are on that list too. Check out this spreadsheet that lists the 100 most-talked about cross platform mobile developers, at least, according to AppStoreHQ’s AppRank.

I dove deeper into those results to get an idea as to how many games different developers were creating per platform and also, what type of games. After all, some companies on the list, like Automattic, the people behind WordPress, have a single application to support across different platforms. For game companies like Gameloft, you’re talking about way more games.

Here are a few stats for some of the larger publishers:

• Capcom Mobile – 4 apps for Android, 27 apps for iOS
• Gameloft – 12 apps for Android, 136 apps for iOS
• Amazon.com – 2 apps for Android, 2 apps for iOS

While the empirical data regarding the number of developers who are making apps for both platforms is extremely interesting, we would still like to see a further breakdown of number of apps by each developer per platform. Going through the list of the 100 most-talked about developers, it looks like the big publishing shops are still embracing iOS at a significantly higher rate than Android.

However, when you look at smaller publishers or developers who only have a flagship app or two, apps are more fairly distributed across platforms. Watching the number of apps that start to come out with both Android and iOS versions upon release will be interesting to observe.