OpenPLZ API vs PostalCodes
Same instrument, two spec sheets — measured, not claimed.
OpenPLZ API vs PostalCodes: common questions
Which is more reliable, OpenPLZ API or PostalCodes?
On our scheduled checks, OpenPLZ API leads on measured uptime — OpenPLZ API 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, OpenPLZ API or PostalCodes?
OpenPLZ API has the lower median latency in our checks — OpenPLZ API responds in 151 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 OpenPLZ API and PostalCodes need an API key?
Neither needs a paid key — OpenPLZ API 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 OpenPLZ API and PostalCodes from the browser?
Only OpenPLZ API 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 OpenPLZ API and PostalCodes free for commercial use?
OpenPLZ API 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.