Cartes.io vs Postali
Same instrument, two spec sheets — measured, not claimed.
Cartes.io vs Postali: common questions
Which is more reliable, Cartes.io or Postali?
On our scheduled checks, Postali leads on measured uptime — Cartes.io at 99.02% versus Postali at 100% 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, Cartes.io or Postali?
Postali has the lower median latency in our checks — Cartes.io responds in 612 ms versus Postali at 69 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 Cartes.io and Postali need an API key?
Neither needs a paid key — Cartes.io is callable with no signup, and Postali is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Cartes.io and Postali from the browser?
Yes — both Cartes.io and Postali 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 Cartes.io and Postali free for commercial use?
Cartes.io has unclear commercial terms, and Postali 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.