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serpstack vs What The Commit

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

APIserpstackNEW—What The CommitNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

serpstack vs What The Commit: common questions

Which is more reliable, serpstack or What The Commit?

On our scheduled checks, What The Commit leads on measured uptime — serpstack at —% versus What The Commit 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 serpstack and What The Commit need an API key?

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

Can I call serpstack and What The Commit from the browser?

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

Are serpstack and What The Commit free for commercial use?

serpstack has unclear commercial terms, and What The Commit 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.