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