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Groundhog Day API vs Weatherstack

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

APIGroundhog Day APIHEALTHY98WeatherstackHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms262309
P95 · ms5961372
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Groundhog Day API vs Weatherstack: common questions

Which is more reliable, Groundhog Day API or Weatherstack?

Both are neck-and-neck — Groundhog Day API 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, Groundhog Day API or Weatherstack?

Groundhog Day API has the lower median latency in our checks — Groundhog Day API responds in 262 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 Groundhog Day API and Weatherstack need an API key?

Groundhog Day API needs no key, while Weatherstack requires a free API key. If you want to start calling without signup, reach for Groundhog Day API first.

Can I call Groundhog Day API and Weatherstack from the browser?

Only Groundhog Day API 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 Groundhog Day API and Weatherstack free for commercial use?

Groundhog Day API 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.