SLF vs Ziptastic
Same instrument, two spec sheets — measured, not claimed.
SLF vs Ziptastic: common questions
Which is more reliable, SLF or Ziptastic?
On our scheduled checks, Ziptastic leads on measured uptime — SLF at —% versus Ziptastic at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
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.