I've finally been able to compile an APK for Android, which is downloadable from https://codeberg.org/freamon/pferd/src/branch/develop/releases/pferd.apk
In addition to the APK, the repo provides the opportunity to build a version of the app to run natively in Windows, MacOS or Linux, or to run in an emulated Android environment. If you want to build your own APK, I'll try to help with all the magic incantations that are seemingly required for Google's ecosystem.
I don't have the means to provide anything for iPhones.
Things to note:
The app is intended for use with https://preferred.social/. Other PieFed sites don't have the API enabled, so won't work. It can't be used for Lemmy sites, and - likewise - Lemmy apps won't work with the site.
If you have the app, and want to do things for which you need an account, you can create one at the site using the code ZeXJkmS46l2h0SiE.
The API has a rudimentary rate-limiter, initially restricting post and comment creation to need a 10 minute gap. There's 2 communities for which it doesn't apply though (a local one at 'local_testing', and a remote one at 'remote_[email protected]') because they both don't federate any further than themselves.
~~Like a dickhead, I created a site in the UK, so it doesn't federate with lemmy.zip. If more sites follow their lead, it'll just be me and feddit.uk in our own private Fediverse.~~
I've already discovered some issues with the app, but I doubt they'll be the only ones.
If other people are able to help out with testing, and it goes well, then we can start taking steps towards enabling the API at other PieFed sites, and distributing the app via recognised channels.
Moreover, if the testing goes well, then the API can be properly documented, and a JS client created, so others can develop their own apps (~~an 'official' PieFed app would ideally be fully FOSS, which this app isn't, 'cos it was made with Flutter~~).
Thanks.
(edited to cross out some bad info)
(edit 2: lemmy.zip's Admin made some changes and got in touch, and I can now federate with lemmy.zip!)
Neat. I saw your name in the 'Users' list (Search -> Explore Instance -> Users).
The API needs a DB upgrade, and so right now I'm in a queue behind 'Feeds', which is a feature that will add some new tables. I don't yet know what kind of upgrade it needs to be, i.e. how much things can be fudged vs. implemented properly.