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Covid Tracking Project vs Open Disease

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

APICovid Tracking ProjectHEALTHY98Open DiseaseHEALTHY94
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms237451
P95 · ms6121226
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0Unverified (sources vary; see project repo)
Free tierFree — no key required (archived dataset)Free — no key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Covid Tracking Project vs Open Disease: common questions

Which is more reliable, Covid Tracking Project or Open Disease?

On our scheduled checks, Covid Tracking Project leads on measured uptime — Covid Tracking Project at 100% versus Open Disease at 99.02% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Covid Tracking Project or Open Disease?

Covid Tracking Project has the lower median latency in our checks — Covid Tracking Project responds in 237 ms versus Open Disease at 451 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 Covid Tracking Project and Open Disease need an API key?

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

Can I call Covid Tracking Project and Open Disease from the browser?

Yes — both Covid Tracking Project and Open Disease 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 Covid Tracking Project and Open Disease free for commercial use?

Covid Tracking Project allows commercial use on its free tier, and Open Disease 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.