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LocalGov.jp vs ONS

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

APILocalGov.jpHEALTHY81ONSHEALTHY90
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1274732
P95 · ms17181819
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0 (attribution: "via LocalGov.jp")Unverified
Free tierFree — all endpoints currently free (per llms.txt)Free — limits not published
Rate limit30 req/window · 29 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

LocalGov.jp vs ONS: common questions

Which is more reliable, LocalGov.jp or ONS?

Both are neck-and-neck — LocalGov.jp 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, LocalGov.jp or ONS?

ONS has the lower median latency in our checks — LocalGov.jp responds in 1274 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 LocalGov.jp and ONS need an API key?

Neither needs a paid key — LocalGov.jp is callable with no signup, and ONS is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call LocalGov.jp and ONS from the browser?

Yes — both LocalGov.jp and ONS 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 LocalGov.jp and ONS free for commercial use?

LocalGov.jp allows commercial use on its free tier, 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.