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Numverify vs TotalShiftLeft Sandbox

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

APINumverifyNEW—TotalShiftLeft SandboxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — open sandbox, auth optional
Rate limitUnpublished100 req/window · 99 remaining · resets 60
In directory since2026-07-052026-07-05
operationalpartialdownno data

Numverify vs TotalShiftLeft Sandbox: common questions

Which is more reliable, Numverify or TotalShiftLeft Sandbox?

On our scheduled checks, TotalShiftLeft Sandbox leads on measured uptime — Numverify 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 Numverify and TotalShiftLeft Sandbox need an API key?

TotalShiftLeft Sandbox needs no key, while Numverify requires a free API key. If you want to start calling without signup, reach for TotalShiftLeft Sandbox first.

Can I call Numverify and TotalShiftLeft Sandbox from the browser?

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

Are Numverify and TotalShiftLeft Sandbox free for commercial use?

Numverify 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.