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ip-api.com vs serpstack

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

APIip-api.comNEW—serpstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ip-api.com vs serpstack: common questions

Which is more reliable, ip-api.com or serpstack?

On our scheduled checks, serpstack leads on measured uptime — ip-api.com at —% versus serpstack 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 ip-api.com and serpstack need an API key?

ip-api.com needs no key, while serpstack requires a free API key. If you want to start calling without signup, reach for ip-api.com first.

Can I call ip-api.com and serpstack from the browser?

Neither sends browser-friendly CORS headers reliably, so call ip-api.com and serpstack from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are ip-api.com and serpstack free for commercial use?

ip-api.com has unclear commercial terms, and serpstack 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.