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Country.is vs PostalCodes

Same instrument, two spec sheets — measured, not claimed.

APICountry.isHEALTHY99PostalCodesHEALTHY84
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms1891030
P95 · ms6432594
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree, no API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Country.is vs PostalCodes: common questions

Which is more reliable, Country.is or PostalCodes?

On our scheduled checks, Country.is leads on measured uptime — Country.is 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, Country.is or PostalCodes?

Country.is has the lower median latency in our checks — Country.is responds in 189 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 Country.is and PostalCodes need an API key?

Neither needs a paid key — Country.is 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 Country.is and PostalCodes from the browser?

Only Country.is 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 Country.is and PostalCodes free for commercial use?

Country.is 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.