RainViewer vs Weatherstack
Same instrument, two spec sheets — measured, not claimed.
RainViewer vs Weatherstack: common questions
Which is more reliable, RainViewer or Weatherstack?
Both are neck-and-neck — RainViewer and Weatherstack 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 Weatherstack?
Weatherstack has the lower median latency in our checks — RainViewer responds in 551 ms versus Weatherstack at 309 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 Weatherstack need an API key?
RainViewer needs no key, while Weatherstack requires a free API key. If you want to start calling without signup, reach for RainViewer first.
Can I call RainViewer and Weatherstack from the browser?
Only RainViewer is browser-friendly — it returns CORS headers over HTTPS. Weatherstack needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are RainViewer and Weatherstack free for commercial use?
RainViewer has unclear commercial terms, and Weatherstack has unclear commercial terms. 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.