mailboxlayer vs The SMS Works API
Same instrument, two spec sheets — measured, not claimed.
mailboxlayer vs The SMS Works API: common questions
Which is more reliable, mailboxlayer or The SMS Works API?
Both are neck-and-neck — mailboxlayer and The SMS Works API 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, mailboxlayer or The SMS Works API?
mailboxlayer has the lower median latency in our checks — mailboxlayer responds in 316 ms versus The SMS Works API at 518 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 mailboxlayer and The SMS Works API need an API key?
Both ask you to authenticate — mailboxlayer uses an API key and The SMS Works API 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 mailboxlayer and The SMS Works API from the browser?
Only The SMS Works API is browser-friendly — it returns CORS headers over HTTPS. mailboxlayer needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are mailboxlayer and The SMS Works API free for commercial use?
mailboxlayer has unclear commercial terms, and The SMS Works API 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.