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OpenQR vs serpstack

Same instrument, two spec sheets — measured, not claimed.

APIOpenQRHEALTHY80serpstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms1125492
P95 · ms28511442
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenQR vs serpstack: common questions

Which is more reliable, OpenQR or serpstack?

On our scheduled checks, OpenQR leads on measured uptime — OpenQR at 100% versus serpstack at 99.02% 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, OpenQR or serpstack?

serpstack has the lower median latency in our checks — OpenQR responds in 1125 ms versus serpstack at 492 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 OpenQR and serpstack need an API key?

Both ask you to authenticate — OpenQR uses an API key and serpstack 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 OpenQR and serpstack from the browser?

Only OpenQR is browser-friendly — it returns CORS headers over HTTPS. serpstack needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are OpenQR and serpstack free for commercial use?

OpenQR has unclear commercial terms, and serpstack 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.