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City, Helsinki vs FastDOL

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

APICity, HelsinkiNEW—FastDOLNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

City, Helsinki vs FastDOL: common questions

Which is more reliable, City, Helsinki or FastDOL?

On our scheduled checks, FastDOL leads on measured uptime — City, Helsinki at —% versus FastDOL 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 City, Helsinki and FastDOL need an API key?

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

Can I call City, Helsinki and FastDOL from the browser?

Neither sends browser-friendly CORS headers reliably, so call City, Helsinki and FastDOL from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are City, Helsinki and FastDOL free for commercial use?

City, Helsinki has unclear commercial terms, and FastDOL 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.