Ducks Unlimited vs ViaCep
Same instrument, two spec sheets — measured, not claimed.
Ducks Unlimited vs ViaCep: common questions
Which is more reliable, Ducks Unlimited or ViaCep?
On our scheduled checks, Ducks Unlimited leads on measured uptime — Ducks Unlimited at 99.02% versus ViaCep at 98.0% 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, Ducks Unlimited or ViaCep?
ViaCep has the lower median latency in our checks — Ducks Unlimited responds in 832 ms versus ViaCep at 651 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 Ducks Unlimited and ViaCep need an API key?
Neither needs a paid key — Ducks Unlimited is callable with no signup, and ViaCep is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Ducks Unlimited and ViaCep from the browser?
Yes — both Ducks Unlimited and ViaCep 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 Ducks Unlimited and ViaCep free for commercial use?
Ducks Unlimited has unclear commercial terms, and ViaCep 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.