serpstack vs VATlayer
Same instrument, two spec sheets — measured, not claimed.
serpstack vs VATlayer: common questions
Which is more reliable, serpstack or VATlayer?
On our scheduled checks, VATlayer leads on measured uptime — serpstack at 99.02% versus VATlayer 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, serpstack or VATlayer?
VATlayer has the lower median latency in our checks — serpstack responds in 492 ms versus VATlayer at 473 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 serpstack and VATlayer need an API key?
Both ask you to authenticate — serpstack uses an API key and VATlayer 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 serpstack and VATlayer from the browser?
Neither sends browser-friendly CORS headers reliably, so call serpstack and VATlayer from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.
Are serpstack and VATlayer free for commercial use?
serpstack has unclear commercial terms, and VATlayer 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.