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Open VSX Registry API vs Sofiaplan

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

APIOpen VSX Registry APINEW—SofiaplanNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit10800 req/window · 10799 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Open VSX Registry API vs Sofiaplan: common questions

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

On our scheduled checks, Sofiaplan leads on measured uptime — Open VSX Registry API at —% versus Sofiaplan at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Open VSX Registry API and Sofiaplan need an API key?

Neither needs a paid key — Open VSX Registry API is callable with no signup, and Sofiaplan is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Open VSX Registry API and Sofiaplan from the browser?

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

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

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