There are some Friendica specific apps, like Friendiqa & Relatica, in addition to Friendica having been designed specifically to ensure that it remains compatible with any Mastodon or GNU Social app, I have several installed on my Android phone, but I find that I personally like the mobile web interface better, at least when I have my account set to using the FRIO theme (this is the one that looks like Facebook, but Friendica has several very different UI themes to choose from) though I did recently start using it as a “web app” by saving it as such after accessing it via Chrome. Not sure if I’ll keep that or not because I really try to avoid using Google services as much as is reasonable.