We take no data and leave no cookies. Outside of our control, analytics may be collected by web platforms (this site is hosted by Render) and built into the app by Apple (you can opt out of device analytics in your device Settings->Privacy).
The fedicat app does not collect any analytics beyond what Apple has built in and does not collect or transmit any information beyond saving your login/session info to resume sessions when you restart the app and whatever information is required to operate with any of the platforms you interact with. Platforms generally have some mechanisms to limit visibility, distribution, and longevity of the content you post on the fediverse, but don’t expect real privacy (DMs are not PMs).