Not Native, Not Pure HTMl5, Hybrid Is a Developer's Compromise
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Developers usually have a preference when it comes to HTML over native mobile apps, and may even be outspoken as to their preference. As the debate rolls on, many companies have come to a developer compromise--hybrid apps that use both technologies.
If you use the iPhone Facebook app, you are already using a hybrid app. The Facebook app loads some pages from their website, as does the Bank of America iPhone app. Other hybrid apps, such as the Harmonius app, use HTML5 for its entire user interface.