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ipapi.com vs SLF

Same instrument, two spec sheets — measured, not claimed.

APIipapi.comHEALTHY96SLFHEALTHY98
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms301213
P95 · ms1575668
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — static file, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ipapi.com vs SLF: common questions

Which is more reliable, ipapi.com or SLF?

Both are neck-and-neck — ipapi.com 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, ipapi.com or SLF?

SLF has the lower median latency in our checks — ipapi.com responds in 301 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 ipapi.com and SLF need an API key?

SLF needs no key, while ipapi.com requires a free API key. If you want to start calling without signup, reach for SLF first.

Can I call ipapi.com and SLF from the browser?

Only SLF is browser-friendly — it returns CORS headers over HTTPS. ipapi.com needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ipapi.com and SLF free for commercial use?

ipapi.com 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.