ISO 3166 Updates API vs PostalCodes
Same instrument, two spec sheets — measured, not claimed.
ISO 3166 Updates API vs PostalCodes: common questions
Which is more reliable, ISO 3166 Updates API or PostalCodes?
On our scheduled checks, ISO 3166 Updates API leads on measured uptime — ISO 3166 Updates API at 100% versus PostalCodes at 99.02% 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, ISO 3166 Updates API or PostalCodes?
PostalCodes has the lower median latency in our checks — ISO 3166 Updates API responds in 1402 ms versus PostalCodes at 1030 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 ISO 3166 Updates API and PostalCodes need an API key?
Neither needs a paid key — ISO 3166 Updates API is callable with no signup, and PostalCodes is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call ISO 3166 Updates API and PostalCodes from the browser?
Only ISO 3166 Updates API is browser-friendly — it returns CORS headers over HTTPS. PostalCodes needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are ISO 3166 Updates API and PostalCodes free for commercial use?
ISO 3166 Updates API has unclear commercial terms, and PostalCodes 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.