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Passantenfrequenzen Zürich vs Serialif Color

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

APIPassantenfrequenzen ZürichNEW—Serialif ColorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
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

Passantenfrequenzen Zürich vs Serialif Color: common questions

Which is more reliable, Passantenfrequenzen Zürich or Serialif Color?

On our scheduled checks, Serialif Color leads on measured uptime — Passantenfrequenzen Zürich 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 Passantenfrequenzen Zürich and Serialif Color need an API key?

Neither needs a paid key — Passantenfrequenzen Zürich 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 Passantenfrequenzen Zürich and Serialif Color from the browser?

Only Passantenfrequenzen Zürich 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 Passantenfrequenzen Zürich and Serialif Color free for commercial use?

Passantenfrequenzen Zürich 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.