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DownStatus vs serpstack

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

APIDownStatusNEW—serpstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no API key (per docs)Free tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

DownStatus vs serpstack: common questions

Which is more reliable, DownStatus or serpstack?

On our scheduled checks, serpstack leads on measured uptime — DownStatus 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 DownStatus and serpstack need an API key?

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

Can I call DownStatus and serpstack from the browser?

Only DownStatus 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 DownStatus and serpstack free for commercial use?

DownStatus 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.