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Glax Weather API vs RainViewer

Same instrument, two spec sheets — measured, not claimed.

APIGlax Weather APINEW—RainViewerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (attribution requested)
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Glax Weather API vs RainViewer: common questions

Which is more reliable, Glax Weather API or RainViewer?

On our scheduled checks, RainViewer leads on measured uptime — Glax Weather API at —% versus RainViewer at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Glax Weather API and RainViewer need an API key?

Neither needs a paid key — Glax Weather API is callable with no signup, and RainViewer is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Glax Weather API and RainViewer from the browser?

Only RainViewer is browser-friendly — it returns CORS headers over HTTPS. Glax Weather API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Glax Weather API and RainViewer free for commercial use?

Glax Weather API has unclear commercial terms, and RainViewer 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.