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APIs.guru vs CDNJS

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

APIAPIs.guruHEALTHY97CDNJSHEALTHY95
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms266281
P95 · ms1421936
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree and open, no keyFree and open, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

APIs.guru vs CDNJS: common questions

Which is more reliable, APIs.guru or CDNJS?

Both are neck-and-neck — APIs.guru and CDNJS 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, APIs.guru or CDNJS?

APIs.guru has the lower median latency in our checks — APIs.guru responds in 266 ms versus CDNJS at 281 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 APIs.guru and CDNJS need an API key?

Neither needs a paid key — APIs.guru is callable with no signup, and CDNJS is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call APIs.guru and CDNJS from the browser?

Yes — both APIs.guru and CDNJS 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 APIs.guru and CDNJS free for commercial use?

APIs.guru has unclear commercial terms, and CDNJS 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.