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Serialif Color vs SLA Uptime Calculator

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

APISerialif ColorNEW—SLA Uptime CalculatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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

Serialif Color vs SLA Uptime Calculator: common questions

Which is more reliable, Serialif Color or SLA Uptime Calculator?

On our scheduled checks, SLA Uptime Calculator leads on measured uptime — Serialif Color at —% versus SLA Uptime Calculator 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 Serialif Color and SLA Uptime Calculator need an API key?

Neither needs a paid key — Serialif Color 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 Serialif Color and SLA Uptime Calculator from the browser?

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

Are Serialif Color and SLA Uptime Calculator free for commercial use?

Serialif Color 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.