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City, Analyze Boston vs ONS

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

APICity, Analyze BostonHEALTHY90ONSHEALTHY90
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms663732
P95 · ms14101819
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

City, Analyze Boston vs ONS: common questions

Which is more reliable, City, Analyze Boston or ONS?

Both are neck-and-neck — City, Analyze Boston and ONS 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, City, Analyze Boston or ONS?

City, Analyze Boston has the lower median latency in our checks — City, Analyze Boston responds in 663 ms versus ONS at 732 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 City, Analyze Boston and ONS need an API key?

ONS needs no key, while City, Analyze Boston requires a free API key. If you want to start calling without signup, reach for ONS first.

Can I call City, Analyze Boston and ONS from the browser?

Only ONS is browser-friendly — it returns CORS headers over HTTPS. City, Analyze Boston needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are City, Analyze Boston and ONS free for commercial use?

City, Analyze Boston has unclear commercial terms, and ONS 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.