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Sofiaplan vs The Guardian

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

APISofiaplanNEW—The GuardianNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree developer key — registration required
Rate limitUnpublished5000 calls/day (developer tier)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Sofiaplan vs The Guardian: common questions

Which is more reliable, Sofiaplan or The Guardian?

On our scheduled checks, The Guardian leads on measured uptime — Sofiaplan at —% versus The Guardian 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 Sofiaplan and The Guardian need an API key?

Sofiaplan needs no key, while The Guardian requires a free API key. If you want to start calling without signup, reach for Sofiaplan first.

Can I call Sofiaplan and The Guardian from the browser?

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

Are Sofiaplan and The Guardian free for commercial use?

Sofiaplan has unclear commercial terms, and The Guardian 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.