SLF vs Ziptastic
Same instrument, two spec sheets — measured, not claimed.
SLF vs Ziptastic: common questions
Which is more reliable, SLF or Ziptastic?
Both are neck-and-neck — SLF and Ziptastic 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, SLF or Ziptastic?
SLF has the lower median latency in our checks — SLF responds in 213 ms versus Ziptastic at 366 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 SLF and Ziptastic need an API key?
Neither needs a paid key — SLF is callable with no signup, and Ziptastic is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call SLF and Ziptastic from the browser?
Yes — both SLF and Ziptastic 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 SLF and Ziptastic free for commercial use?
SLF has unclear commercial terms, and Ziptastic 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.