Postcodes.io vs Proweblook IP Checker
Same instrument, two spec sheets — measured, not claimed.
Postcodes.io vs Proweblook IP Checker: common questions
Which is more reliable, Postcodes.io or Proweblook IP Checker?
Both are neck-and-neck — Postcodes.io and Proweblook IP Checker 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, Postcodes.io or Proweblook IP Checker?
Postcodes.io has the lower median latency in our checks — Postcodes.io responds in 33 ms versus Proweblook IP Checker at 56 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 Postcodes.io and Proweblook IP Checker need an API key?
Postcodes.io needs no key, while Proweblook IP Checker requires a free API key. If you want to start calling without signup, reach for Postcodes.io first.
Can I call Postcodes.io and Proweblook IP Checker from the browser?
Yes — both Postcodes.io and Proweblook IP Checker send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are Postcodes.io and Proweblook IP Checker free for commercial use?
Postcodes.io has unclear commercial terms, and Proweblook IP Checker 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.