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RSQ API vs Serialif Color

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

APIRSQ APINEW—Serialif ColorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSnoyes
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

RSQ API vs Serialif Color: common questions

Which is more reliable, RSQ API or Serialif Color?

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

Neither needs a paid key — RSQ API is callable with no signup, and Serialif Color is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call RSQ API and Serialif Color from the browser?

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

Are RSQ API and Serialif Color free for commercial use?

RSQ API has unclear commercial terms, and Serialif Color 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.