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PostcodeData.nl vs Postcodes.io

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

APIPostcodeData.nlHEALTHY91Postcodes.ioHEALTHY100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms69233
P95 · ms1989328
Authnonenone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedService MIT-licensed; postcode data license unverified
Free tierFree — limits not publishedFree — no key required
Rate limitUnpublishedUnpublished (no key; fair use)
In directory since2026-07-052026-07-05
operationalpartialdownno data

PostcodeData.nl vs Postcodes.io: common questions

Which is more reliable, PostcodeData.nl or Postcodes.io?

Both are neck-and-neck — PostcodeData.nl and Postcodes.io each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, PostcodeData.nl or Postcodes.io?

Postcodes.io has the lower median latency in our checks — PostcodeData.nl responds in 692 ms versus Postcodes.io at 33 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do PostcodeData.nl and Postcodes.io need an API key?

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

Can I call PostcodeData.nl and Postcodes.io from the browser?

Only Postcodes.io 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 PostcodeData.nl and Postcodes.io free for commercial use?

PostcodeData.nl has unclear commercial terms, and Postcodes.io 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.