IP Data API vs Postcodes.io
Same instrument, two spec sheets — measured, not claimed.
IP Data API vs Postcodes.io: common questions
Which is more reliable, IP Data API or Postcodes.io?
On our scheduled checks, Postcodes.io leads on measured uptime — IP Data API at 99.02% versus Postcodes.io at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, IP Data API or Postcodes.io?
Postcodes.io has the lower median latency in our checks — IP Data API responds in 124 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 IP Data API and Postcodes.io need an API key?
Neither needs a paid key — IP Data 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 IP Data API and Postcodes.io from the browser?
Yes — both IP Data 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 IP Data API and Postcodes.io free for commercial use?
IP Data 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.