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Covid Tracking Project vs ES·pera API

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

APICovid Tracking ProjectHEALTHY99ES·pera APIDYING37
Uptime · 30d
Uptime · 90d100%0.0%
Uptime · 30d100%0.0%
P50 · ms189—
P95 · ms585—
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0
Free tierFree — no key required (archived dataset)
Rate limitUnpublished
In directory since2026-07-052026-09-21
operationalpartialdownno data

Covid Tracking Project vs ES·pera API: common questions

Which is more reliable, Covid Tracking Project or ES·pera API?

On our scheduled checks, Covid Tracking Project leads on measured uptime — Covid Tracking Project at 100% versus ES·pera API at 0.0% 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 Covid Tracking Project and ES·pera API need an API key?

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

Can I call Covid Tracking Project and ES·pera API from the browser?

Only Covid Tracking Project is browser-friendly — it returns CORS headers over HTTPS. ES·pera API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Covid Tracking Project and ES·pera API free for commercial use?

Covid Tracking Project allows commercial use on its free tier, and ES·pera 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.