Can you use other apps on Echelon bike?

Can you elaborate on the capabilities of the Echelon bike with regards to compatibility with other apps? Specifically, are there any limitations to what apps can be integrated or utilized while using the Echelon bike? Are there any official partnerships or preferred apps that are recommended for use? Furthermore, is there a way to customize the bike's interface to better integrate with the apps of choice? Clarifying these details would greatly assist potential users in understanding the full functionality and versatility of the Echelon bike.