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Open VSX Registry API vs Registrum API

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

APIOpen VSX Registry APIHEALTHY95Registrum APIHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms245246
P95 · ms6931553
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 Registrum API: common questions

Which is more reliable, Open VSX Registry API or Registrum API?

Both are neck-and-neck — Open VSX Registry API and Registrum 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, Open VSX Registry API or Registrum API?

Open VSX Registry API has the lower median latency in our checks — Open VSX Registry API responds in 245 ms versus Registrum API at 246 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 Registrum API need an API key?

Open VSX Registry API needs no key, while Registrum API 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 Registrum API from the browser?

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

Are Open VSX Registry API and Registrum API free for commercial use?

Open VSX Registry API has unclear commercial terms, and Registrum 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.