CountryStateCity vs Zipcodestack
Same instrument, two spec sheets — measured, not claimed.
CountryStateCity vs Zipcodestack: common questions
Which is more reliable, CountryStateCity or Zipcodestack?
On our scheduled checks, Zipcodestack leads on measured uptime — CountryStateCity at —% versus Zipcodestack 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 Zipcodestack need an API key?
Both ask you to authenticate — CountryStateCity uses an API key and Zipcodestack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call CountryStateCity and Zipcodestack from the browser?
Yes — both CountryStateCity and Zipcodestack 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 Zipcodestack free for commercial use?
CountryStateCity has unclear commercial terms, and Zipcodestack 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.