RainViewer vs UK Carbon Intensity
Same instrument, two spec sheets — measured, not claimed.
RainViewer vs UK Carbon Intensity: common questions
Which is more reliable, RainViewer or UK Carbon Intensity?
Both are neck-and-neck — RainViewer and UK Carbon Intensity each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, RainViewer or UK Carbon Intensity?
RainViewer has the lower median latency in our checks — RainViewer responds in 551 ms versus UK Carbon Intensity at 789 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do RainViewer and UK Carbon Intensity need an API key?
Neither needs a paid key — RainViewer is callable with no signup, and UK Carbon Intensity is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call RainViewer and UK Carbon Intensity from the browser?
Yes — both RainViewer and UK Carbon Intensity send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are RainViewer and UK Carbon Intensity free for commercial use?
RainViewer has unclear commercial terms, and UK Carbon Intensity allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.