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ListLoco API vs SLA Uptime Calculator

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

APIListLoco APIHEALTHY100SLA Uptime CalculatorHEALTHY82
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1271373
P95 · ms4432741
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ListLoco API vs SLA Uptime Calculator: common questions

Which is more reliable, ListLoco API or SLA Uptime Calculator?

Both are neck-and-neck — ListLoco API and SLA Uptime Calculator each measure 100% 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, ListLoco API or SLA Uptime Calculator?

ListLoco API has the lower median latency in our checks — ListLoco API responds in 127 ms versus SLA Uptime Calculator at 1373 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 ListLoco API and SLA Uptime Calculator need an API key?

Neither needs a paid key — ListLoco API is callable with no signup, and SLA Uptime Calculator is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ListLoco API and SLA Uptime Calculator from the browser?

Only SLA Uptime Calculator is browser-friendly — it returns CORS headers over HTTPS. ListLoco API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ListLoco API and SLA Uptime Calculator free for commercial use?

ListLoco API has unclear commercial terms, and SLA Uptime Calculator 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.