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caldays vs Grass Touch API

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

APIcaldaysNEW—Grass Touch APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

caldays vs Grass Touch API: common questions

Which is more reliable, caldays or Grass Touch API?

On our scheduled checks, Grass Touch API leads on measured uptime — caldays at —% versus Grass Touch API 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 caldays and Grass Touch API need an API key?

Neither needs a paid key — caldays is callable with no signup, and Grass Touch API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call caldays and Grass Touch API from the browser?

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

Are caldays and Grass Touch API free for commercial use?

caldays has unclear commercial terms, and Grass Touch API 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.