Open-Elevation API vs SLF
Same instrument, two spec sheets — measured, not claimed.
Open-Elevation API vs SLF: common questions
Which is more reliable, Open-Elevation API or SLF?
On our scheduled checks, SLF leads on measured uptime — Open-Elevation API at 92.2% versus SLF 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, Open-Elevation API or SLF?
SLF has the lower median latency in our checks — Open-Elevation API responds in 739 ms versus SLF at 213 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 Open-Elevation API and SLF need an API key?
Neither needs a paid key — Open-Elevation API is callable with no signup, and SLF is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Open-Elevation API and SLF from the browser?
Yes — both Open-Elevation API and SLF 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 Open-Elevation API and SLF free for commercial use?
Open-Elevation API has unclear commercial terms, and SLF 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.