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SLA Uptime Calculator vs TotalShiftLeft Sandbox

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

APISLA Uptime CalculatorNEW—TotalShiftLeft SandboxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — open sandbox, auth optional
Rate limitUnpublished100 req/window · 99 remaining · resets 60
In directory since2026-07-052026-07-05
operationalpartialdownno data

SLA Uptime Calculator vs TotalShiftLeft Sandbox: common questions

Which is more reliable, SLA Uptime Calculator or TotalShiftLeft Sandbox?

On our scheduled checks, TotalShiftLeft Sandbox leads on measured uptime — SLA Uptime Calculator at —% versus TotalShiftLeft Sandbox 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 SLA Uptime Calculator and TotalShiftLeft Sandbox need an API key?

Neither needs a paid key — SLA Uptime Calculator is callable with no signup, and TotalShiftLeft Sandbox is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call SLA Uptime Calculator and TotalShiftLeft Sandbox from the browser?

Only SLA Uptime Calculator is browser-friendly — it returns CORS headers over HTTPS. TotalShiftLeft Sandbox needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are SLA Uptime Calculator and TotalShiftLeft Sandbox free for commercial use?

SLA Uptime Calculator has unclear commercial terms, and TotalShiftLeft Sandbox 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.