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serpstack vs US Autocomplete

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

APIserpstackNEW—US AutocompleteREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

serpstack vs US Autocomplete: common questions

Which is more reliable, serpstack or US Autocomplete?

On our scheduled checks, US Autocomplete leads on measured uptime — serpstack at —% versus US Autocomplete 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 US Autocomplete need an API key?

Both ask you to authenticate — serpstack uses an API key and US Autocomplete uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call serpstack and US Autocomplete from the browser?

Only US Autocomplete 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 serpstack and US Autocomplete free for commercial use?

serpstack has unclear commercial terms, and US Autocomplete 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.