That L/M/H cloud breakdown is always beneficial, "Clear Outside" also has a similar feature in the forecast https://clearoutside.com/forecast/50.7/-3.52

I've mainly used YR:s API, it's no fuss, no registration and the data is good enough for me in a neighbouring country. It's a perk that they have some neat widget endpoints that consume a location and generate an image.

I know that this is shameless self-promotion, but maybe this could interest you: https://sunsethue.com/ :)

Nice to see how much you've developed Sunsethue over the last two years! I remember I built myself some custom alert logic back with your API even before the public launch :)

A year and a half or something later.. I recently started a project of my own trying to bring all "weather dependent" photo opportunities together in one place, if you wouldn't mind I would be happy to experiment with bringing Sunsethue data to https://photoweather.app - your prediction model is certainly a lot more sophisticated than mine and it would be very cool to offer that

Wow, looks like a very cool project! Feel free to experiment with the Sunsethue API! Send me an email if you'd need a higher quota to play around with.