The first alpha was just released and is only available on Github at the moment. The dev has been active in contributing to Geometric Weather after the main developer of it disappeared. It looks like he decided to just fork it and make his own thing!
This looks really nice. Was using Prognoza for a while, but ended up back with the BBC Weather app here in the UK as I couldn’t find a good open source app that showed allergy/pollen information.
This does seem to show allergens for some areas, though not all. Possibly a bug given the provider (AccuWeather) does provide it for each area on their website. If that’s fixed I’d probably be able to use it exclusively.