Postali vs Zipcodestack
Same instrument, two spec sheets — measured, not claimed.
Postali vs Zipcodestack: common questions
Which is more reliable, Postali or Zipcodestack?
On our scheduled checks, Zipcodestack leads on measured uptime — Postali 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 Postali and Zipcodestack need an API key?
Postali needs no key, while Zipcodestack requires a free API key. If you want to start calling without signup, reach for Postali first.
Can I call Postali and Zipcodestack from the browser?
Yes — both Postali 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 Postali and Zipcodestack free for commercial use?
Postali 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.