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Chronicling America vs Umeå Open Data

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

APIChronicling AmericaNEW—Umeå Open DataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain / no known copyright (Library of Congress)Varies by dataset (municipal open data; see portal)
Free tierFree — public-domain collection dataFree — open data portal, no key
Rate limitLoC throttles heavy crawling (see LoC API policy)1000 req/window · 999 remaining · resets 2026-07-09 00:00:00+00:00
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chronicling America vs Umeå Open Data: common questions

Which is more reliable, Chronicling America or Umeå Open Data?

On our scheduled checks, Umeå Open Data leads on measured uptime — Chronicling America at —% versus Umeå Open Data at —% 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 Chronicling America and Umeå Open Data need an API key?

Neither needs a paid key — Chronicling America is callable with no signup, and Umeå Open Data is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Chronicling America and Umeå Open Data from the browser?

Only Umeå Open Data is browser-friendly — it returns CORS headers over HTTPS. Chronicling America needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Chronicling America and Umeå Open Data free for commercial use?

Chronicling America allows commercial use on its free tier, and Umeå Open Data 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.