Proweblook IP Checker vs SLF
Same instrument, two spec sheets — measured, not claimed.
Proweblook IP Checker vs SLF: common questions
Which is more reliable, Proweblook IP Checker or SLF?
Both are neck-and-neck — Proweblook IP Checker and SLF each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, Proweblook IP Checker or SLF?
Proweblook IP Checker has the lower median latency in our checks — Proweblook IP Checker responds in 56 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 Proweblook IP Checker and SLF need an API key?
SLF needs no key, while Proweblook IP Checker requires a free API key. If you want to start calling without signup, reach for SLF first.
Can I call Proweblook IP Checker and SLF from the browser?
Yes — both Proweblook IP Checker 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 Proweblook IP Checker and SLF free for commercial use?
Proweblook IP Checker 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.