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NetworkCalc vs serpstack

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

APINetworkCalcHEALTHY91serpstackHEALTHY93
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%98.3%
P50 · ms448492
P95 · ms39761442
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree public API, no keyFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

NetworkCalc vs serpstack: common questions

Which is more reliable, NetworkCalc or serpstack?

Both are neck-and-neck — NetworkCalc and serpstack each measure 99.02% 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, NetworkCalc or serpstack?

NetworkCalc has the lower median latency in our checks — NetworkCalc responds in 448 ms versus serpstack at 492 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 NetworkCalc and serpstack need an API key?

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

Can I call NetworkCalc and serpstack from the browser?

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

Are NetworkCalc and serpstack free for commercial use?

NetworkCalc 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.