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ELI vs serpstack

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

APIELIHEALTHY92serpstackHEALTHY93
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%98.3%
P50 · ms591492
P95 · ms18171442
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ELI vs serpstack: common questions

Which is more reliable, ELI or serpstack?

Both are neck-and-neck — ELI and serpstack each measure 99.02% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, ELI or serpstack?

serpstack has the lower median latency in our checks — ELI responds in 591 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 ELI and serpstack need an API key?

Both ask you to authenticate — ELI uses an API key and serpstack 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 ELI and serpstack from the browser?

Only ELI 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 ELI and serpstack free for commercial use?

ELI 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.