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CountryStateCity vs Postcodes.io

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

APICountryStateCityNEW—Postcodes.ioNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedService MIT-licensed; postcode data license unverified
Free tierFree tier — API key requiredFree — no key required
Rate limitUnpublishedUnpublished (no key; fair use)
In directory since2026-07-052026-07-05
operationalpartialdownno data

CountryStateCity vs Postcodes.io: common questions

Which is more reliable, CountryStateCity or Postcodes.io?

On our scheduled checks, Postcodes.io leads on measured uptime — CountryStateCity at —% versus Postcodes.io at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do CountryStateCity and Postcodes.io need an API key?

Postcodes.io needs no key, while CountryStateCity requires a free API key. If you want to start calling without signup, reach for Postcodes.io first.

Can I call CountryStateCity and Postcodes.io from the browser?

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

CountryStateCity 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.