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Country.is vs Postcodes.io

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

APICountry.isHEALTHY99Postcodes.ioHEALTHY100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms18933
P95 · ms643328
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedService MIT-licensed; postcode data license unverified
Free tierFree, no API key requiredFree — no key required
Rate limitUnpublishedUnpublished (no key; fair use)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Country.is vs Postcodes.io: common questions

Which is more reliable, Country.is or Postcodes.io?

Both are neck-and-neck — Country.is 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, Country.is or Postcodes.io?

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

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

Yes — both Country.is 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 Country.is and Postcodes.io free for commercial use?

Country.is 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.