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Open VSX Registry API vs Web of Science API Expanded

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

APIOpen VSX Registry APIHEALTHY95Web of Science API ExpandedHEALTHY88
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms245787
P95 · ms6931985
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit10800 req/window · 10799 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Open VSX Registry API vs Web of Science API Expanded: common questions

Which is more reliable, Open VSX Registry API or Web of Science API Expanded?

On our scheduled checks, Open VSX Registry API leads on measured uptime — Open VSX Registry API at 100% versus Web of Science API Expanded 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, Open VSX Registry API or Web of Science API Expanded?

Open VSX Registry API has the lower median latency in our checks — Open VSX Registry API responds in 245 ms versus Web of Science API Expanded at 787 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 Open VSX Registry API and Web of Science API Expanded need an API key?

Open VSX Registry API needs no key, while Web of Science API Expanded requires a free API key. If you want to start calling without signup, reach for Open VSX Registry API first.

Can I call Open VSX Registry API and Web of Science API Expanded from the browser?

Only Open VSX Registry API is browser-friendly — it returns CORS headers over HTTPS. Web of Science API Expanded needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Open VSX Registry API and Web of Science API Expanded free for commercial use?

Open VSX Registry API has unclear commercial terms, and Web of Science API Expanded 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.