PostcodeData.nl vs Zippopotam.us
Same instrument, two spec sheets — measured, not claimed.
PostcodeData.nl vs Zippopotam.us: common questions
Which is more reliable, PostcodeData.nl or Zippopotam.us?
Both are neck-and-neck — PostcodeData.nl and Zippopotam.us 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 Zippopotam.us?
Zippopotam.us has the lower median latency in our checks — PostcodeData.nl responds in 692 ms versus Zippopotam.us at 219 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 Zippopotam.us need an API key?
Neither needs a paid key — PostcodeData.nl is callable with no signup, and Zippopotam.us is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call PostcodeData.nl and Zippopotam.us from the browser?
Only Zippopotam.us 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 Zippopotam.us free for commercial use?
PostcodeData.nl has unclear commercial terms, and Zippopotam.us 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.