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PostcodeData.nl vs What3Words

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

APIPostcodeData.nlNEW—What3WordsNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PostcodeData.nl vs What3Words: common questions

Which is more reliable, PostcodeData.nl or What3Words?

On our scheduled checks, What3Words leads on measured uptime — PostcodeData.nl at —% versus What3Words 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 PostcodeData.nl and What3Words need an API key?

PostcodeData.nl needs no key, while What3Words requires a free API key. If you want to start calling without signup, reach for PostcodeData.nl first.

Can I call PostcodeData.nl and What3Words from the browser?

Neither sends browser-friendly CORS headers reliably, so call PostcodeData.nl and What3Words from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are PostcodeData.nl and What3Words free for commercial use?

PostcodeData.nl has unclear commercial terms, and What3Words 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.