application for mobile
Please create a mobile application so that the user would be able to synchronize the desktop calendar with the mobile calendar.
Synchronizing Fruux desktop application to a third-party's mobile calendar means that this third-party calendar may use the user information/event and share it with data broker or ad companies.

We are focussed on backend development. Many platforms support CardDAV/CalDAV natively (e.g. iOS/macOS) and there are open source implementations for Windows (Outlook CalDAV Synchronizer), Android (DAVdroid) and Linux (via Thunderbird Lightning etc.).
We shouldn’t reinvent the wheel and lose focus on what matters (a solid backe end that supports open standards and allows other to build great frontend apps).
If we were an email provider it would also make little sense for us to build email client apps.