GrünstromIndex vs IQAir

GrünstromIndex (GSI) forecasts, by German postal code, what share of the electricity grid is renewable for the coming hours, so consumers and devices can shift usage toward greener periods. The public front end at gruenstromindex.de is now branded Corrently, and the underlying forecast gateway (api.corrently.io) is HTTPS-only even though the demo site itself still serves over plain HTTP.

IQAir's AirVisual API serves real-time and forecast air-quality and weather data for stations and cities worldwide. Its free Community plan covers up to 500 calls/day, with paid Startup ($399/mo) and Enterprise ($999/mo) tiers unlocking much higher volume.