Mastodon, Pleroma, Friendica, Pixelfed, PeerTube, dare I say it even Twitter, all have websites that work perfectly fine on mobile. I don't understand this obsession with 'I'm on mobile so I should select an app' or 'I want to see the website so I should use a computer'. The sites may even work better than the app. Often you can save them to your home screen too.

You may consider the feature that apps of mainstream social media provided of extra tracking and snooping to be a nice bonus, but you're not going to get that anyway in fediverse apps.