They don’t. Web only and considerable heavier and harder to get running than FileBrowser.
Can I use CryptPad on mobile? CryptPad is engineered to work as well as possible on small screens. Depending on your device performance it should be possible to use CryptPad on mobile. Work to make CryptPad more responsive was undertaken in 2020, if you notice areas that need improvement in this regard, please contact Support or submit an issue on Github.