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QR & Barcode vs Userstack

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

APIQR & BarcodeHEALTHY91UserstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms722443
P95 · ms13443029
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

QR & Barcode vs Userstack: common questions

Which is more reliable, QR & Barcode or Userstack?

On our scheduled checks, QR & Barcode leads on measured uptime — QR & Barcode at 100% versus Userstack 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, QR & Barcode or Userstack?

Userstack has the lower median latency in our checks — QR & Barcode responds in 722 ms versus Userstack at 443 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 QR & Barcode and Userstack need an API key?

QR & Barcode needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for QR & Barcode first.

Can I call QR & Barcode and Userstack from the browser?

Yes — both QR & Barcode and Userstack 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 QR & Barcode and Userstack free for commercial use?

QR & Barcode has unclear commercial terms, and Userstack 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.