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Free Dictionary API vs Open VSX Registry API

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

APIFree Dictionary APIHEALTHY90Open VSX Registry APIHEALTHY95
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms674245
P95 · ms2196693
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublished10800 req/window · 10799 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Dictionary API vs Open VSX Registry API: common questions

Which is more reliable, Free Dictionary API or Open VSX Registry API?

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

Open VSX Registry API has the lower median latency in our checks — Free Dictionary API responds in 674 ms versus Open VSX Registry API at 245 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 Free Dictionary API and Open VSX Registry API need an API key?

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

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

Yes — both Free Dictionary API and Open VSX Registry API 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 Free Dictionary API and Open VSX Registry API free for commercial use?

Free Dictionary API has unclear commercial terms, and Open VSX Registry 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.