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InternetDB API vs serpstack

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

APIInternetDB APIHEALTHY99serpstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms133492
P95 · ms22601442
AuthnoneapiKey
CORSyesno
HTTPSyesyes
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

InternetDB API vs serpstack: common questions

Which is more reliable, InternetDB API or serpstack?

On our scheduled checks, InternetDB API leads on measured uptime — InternetDB API at 100% versus serpstack at 99.02% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, InternetDB API or serpstack?

InternetDB API has the lower median latency in our checks — InternetDB API responds in 133 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 InternetDB API and serpstack need an API key?

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

Can I call InternetDB API and serpstack from the browser?

Only InternetDB API 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 InternetDB API and serpstack free for commercial use?

InternetDB API 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.