1. Limited Third-Party Libraries: Xamarin has a limited range of third-party libraries available for use in development. This can limit the features that can be included in an app, and can also lead to additional development time as custom solutions may need to be created.
2. Limited Platform Support: Xamarin supports only the two major mobile platforms, iOS and Android. This means that if you want to develop an app for Windows Phone or Blackberry, you will need to use a different technology.
3. Complex User Interface: Xamarin does not have a built-in user interface designer, so creating custom user interfaces can be complex and time-consuming.
4. Expensive Licensing: Xamarin requires a paid license for commercial use. This can be expensive, especially for small businesses and startups.
5. Limited Debugging Capabilities: Xamarin does not have the same debugging capabilities as some of the other mobile development platforms, making it more difficult to identify and fix bugs.