Arul's IP API vs Postcodes.io
Same instrument, two spec sheets — measured, not claimed.
Arul's IP API vs Postcodes.io: common questions
Which is more reliable, Arul's IP API or Postcodes.io?
Both are neck-and-neck — Arul's IP API 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, Arul's IP API or Postcodes.io?
Postcodes.io has the lower median latency in our checks — Arul's IP API responds in 502 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 Arul's IP API and Postcodes.io need an API key?
Neither needs a paid key — Arul's IP API 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 Arul's IP API and Postcodes.io from the browser?
Yes — both Arul's IP API and Postcodes.io 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 Arul's IP API and Postcodes.io free for commercial use?
Arul's IP API 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.