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httpSMS vs NetworkCalc

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

APIhttpSMSNEW—NetworkCalcNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree public API, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

httpSMS vs NetworkCalc: common questions

Which is more reliable, httpSMS or NetworkCalc?

On our scheduled checks, NetworkCalc leads on measured uptime — httpSMS at —% versus NetworkCalc 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 httpSMS and NetworkCalc need an API key?

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

Can I call httpSMS and NetworkCalc from the browser?

Yes — both httpSMS and NetworkCalc send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are httpSMS and NetworkCalc free for commercial use?

httpSMS has unclear commercial terms, and NetworkCalc 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.