Cisco Spark vs PostStack
Same instrument, two spec sheets — measured, not claimed.
Cisco Spark vs PostStack: common questions
Which is more reliable, Cisco Spark or PostStack?
On our scheduled checks, PostStack leads on measured uptime — Cisco Spark at 99.44% versus PostStack at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Cisco Spark or PostStack?
PostStack has the lower median latency in our checks — Cisco Spark responds in 1331 ms versus PostStack at 318 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 Cisco Spark and PostStack need an API key?
Both ask you to authenticate — Cisco Spark uses an API key and PostStack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call Cisco Spark and PostStack from the browser?
Only Cisco Spark is browser-friendly — it returns CORS headers over HTTPS. PostStack needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Cisco Spark and PostStack free for commercial use?
Cisco Spark has unclear commercial terms, and PostStack 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.