Nope! Nearly all features are available in the website. Client apps can offer a more native UI experience, additional features, and may behave better in crowded network environments.
Apps are built by community members just like you! Sometimes not all features are available in all apps. Many of them are pet projects that people maintain for fun because they enhance their vacation.
We suggest downloading them all and trying them for yourself!
Kinda. You will need internet access to download client apps for iOS and Android devices from their respective app stores. You will not need internet access to use the apps after they are installed. Similarly, the website does not require internet access to use.