IP2Location vs SLF
Same instrument, two spec sheets — measured, not claimed.
IP2Location vs SLF: common questions
Which is more reliable, IP2Location or SLF?
Both are neck-and-neck — IP2Location 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, IP2Location or SLF?
IP2Location has the lower median latency in our checks — IP2Location responds in 131 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 IP2Location and SLF need an API key?
SLF needs no key, while IP2Location requires a free API key. If you want to start calling without signup, reach for SLF first.
Can I call IP2Location and SLF from the browser?
Only SLF is browser-friendly — it returns CORS headers over HTTPS. IP2Location needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are IP2Location and SLF free for commercial use?
IP2Location 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.