Cisco Spark vs mail.tm
Same instrument, two spec sheets — measured, not claimed.
Cisco Spark vs mail.tm: common questions
Which is more reliable, Cisco Spark or mail.tm?
On our scheduled checks, Cisco Spark leads on measured uptime — Cisco Spark at 100% versus mail.tm at 84.3% 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 mail.tm?
mail.tm has the lower median latency in our checks — Cisco Spark responds in 1608 ms versus mail.tm at 709 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 mail.tm need an API key?
mail.tm needs no key, while Cisco Spark requires a free API key. If you want to start calling without signup, reach for mail.tm first.
Can I call Cisco Spark and mail.tm from the browser?
Only Cisco Spark is browser-friendly — it returns CORS headers over HTTPS. mail.tm needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Cisco Spark and mail.tm free for commercial use?
Cisco Spark has unclear commercial terms, and mail.tm 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.