Productivity

calculatorspan

Last updated 2026-08-27 · benchmark measured 2026-08-27 — deterministic & reproducible

Free online calculators for time, dates, and everyday math.

Is calculatorspan production-ready?

Legit.Show scores calculatorspan 80 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on calculatorspan (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Accessibility; its weakest is Privacy. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

• Performance — 90/100
• Accessibility — 100/100
• Security — 45/100
• Privacy — 45/100
• Reliability — 100/100
• Standards — 92/100
• Discoverability — 87/100

What we measured

• Security headers present: CSP.
• No HSTS.
• Served over HTTPS with a valid certificate.
• Real Lighthouse performance run — 164 ms to first byte.
• Returns a proper 404 for unknown routes.
• 3 of 3 sampled routes reachable.
• Has a reachable privacy policy.
• Sets cookies / loads scripts with no consent prompt.

Who it's for

Workers and hourly employees · Project managers · Anyone needing time/date math · Shift planners

Pricing

Free

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