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ClinicalTrials.gov vs Covid Tracking Project

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

APIClinicalTrials.govHEALTHY78Covid Tracking ProjectHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms138189
P95 · ms3533585
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY 4.0
Free tierFree — limits not publishedFree — no key required (archived dataset)
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ClinicalTrials.gov vs Covid Tracking Project: common questions

Which is more reliable, ClinicalTrials.gov or Covid Tracking Project?

Both are neck-and-neck — ClinicalTrials.gov and Covid Tracking Project 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, ClinicalTrials.gov or Covid Tracking Project?

ClinicalTrials.gov has the lower median latency in our checks — ClinicalTrials.gov responds in 138 ms versus Covid Tracking Project at 189 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 ClinicalTrials.gov and Covid Tracking Project need an API key?

Neither needs a paid key — ClinicalTrials.gov is callable with no signup, and Covid Tracking Project is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ClinicalTrials.gov and Covid Tracking Project from the browser?

Yes — both ClinicalTrials.gov and Covid Tracking Project 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 ClinicalTrials.gov and Covid Tracking Project free for commercial use?

ClinicalTrials.gov has unclear commercial terms, and Covid Tracking Project allows commercial use on its free tier. 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.