Ducks Unlimited vs PostalCodes
Same instrument, two spec sheets — measured, not claimed.
Ducks Unlimited vs PostalCodes: common questions
Which is more reliable, Ducks Unlimited or PostalCodes?
On our scheduled checks, Ducks Unlimited leads on measured uptime — Ducks Unlimited at 99.44% versus PostalCodes at 80.9% 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 PostalCodes?
Ducks Unlimited has the lower median latency in our checks — Ducks Unlimited responds in 395 ms versus PostalCodes at 968 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 PostalCodes need an API key?
Neither needs a paid key — Ducks Unlimited is callable with no signup, and PostalCodes is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Ducks Unlimited and PostalCodes from the browser?
Only Ducks Unlimited is browser-friendly — it returns CORS headers over HTTPS. PostalCodes needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Ducks Unlimited and PostalCodes free for commercial use?
Ducks Unlimited has unclear commercial terms, and PostalCodes 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.