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OpenPLZ API vs PostcodeData.nl

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

APIOpenPLZ APINEW—PostcodeData.nlNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesno
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

OpenPLZ API vs PostcodeData.nl: common questions

Which is more reliable, OpenPLZ API or PostcodeData.nl?

On our scheduled checks, PostcodeData.nl leads on measured uptime — OpenPLZ API at —% versus PostcodeData.nl 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 OpenPLZ API and PostcodeData.nl need an API key?

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

Can I call OpenPLZ API and PostcodeData.nl from the browser?

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

Are OpenPLZ API and PostcodeData.nl free for commercial use?

OpenPLZ API has unclear commercial terms, and PostcodeData.nl 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.