Cisco Spark vs Guerrilla Mail
Same instrument, two spec sheets — measured, not claimed.
Cisco Spark vs Guerrilla Mail: common questions
Which is more reliable, Cisco Spark or Guerrilla Mail?
Both are neck-and-neck — Cisco Spark and Guerrilla Mail each measure 99.44% 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, Cisco Spark or Guerrilla Mail?
Guerrilla Mail has the lower median latency in our checks — Cisco Spark responds in 1331 ms versus Guerrilla Mail at 185 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 Guerrilla Mail need an API key?
Guerrilla Mail needs no key, while Cisco Spark requires a free API key. If you want to start calling without signup, reach for Guerrilla Mail first.
Can I call Cisco Spark and Guerrilla Mail from the browser?
Yes — both Cisco Spark and Guerrilla Mail 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 Cisco Spark and Guerrilla Mail free for commercial use?
Cisco Spark has unclear commercial terms, and Guerrilla Mail 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.