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Genderize.io vs TotalShiftLeft Sandbox

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

APIGenderize.ioNEW—TotalShiftLeft SandboxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierKeyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free keyFree — open sandbox, auth optional
Rate limitKeyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headers100 req/window · 99 remaining · resets 60
In directory since2026-07-052026-07-05
operationalpartialdownno data

Genderize.io vs TotalShiftLeft Sandbox: common questions

Which is more reliable, Genderize.io or TotalShiftLeft Sandbox?

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

Neither needs a paid key — Genderize.io 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 Genderize.io and TotalShiftLeft Sandbox from the browser?

Only Genderize.io 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 Genderize.io and TotalShiftLeft Sandbox free for commercial use?

Genderize.io 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.