| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Quick, free converters and calculators for everyday use with no sign-up required
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| Stage | Not given
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| Founded | Not given
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| Based in | US
| US
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| Pricing model | Free
| Free
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| Pricing | Not given
| Not given
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| Key features | - Reaction time measured in milliseconds
- Sessions of 5, 10 or 20 rounds
- Best and average score tracking
- Percentile comparison with online-test benchmarks
- Shareable score card and friend challenge link
- Light and dark mode
- Works on mobile, tablet and desktop
- No registration or download required
- Random delay prevents anticipation
| - Unit converters for length, weight and distance
- Cooking and baking converters including cups to grams and oven temperature
- Health calculators for BMI, body fat, calorie and pregnancy
- Math calculators including scientific, fractions and geometry
- Date and time calculators for age, birthdays and time zones
- Everyday calculators for GPA, concrete, flooring and home projects
- Calculations performed entirely in browser with no data transmission
- Internationally agreed unit conversion definitions
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| What makes it different | - No sign-up, download, or account required
- Does not collect or store personal data
- Sub-millisecond timer precision using browser performance API
- Benchmarks against pro gamers, trained athletes, and average adults
- Fast and clean interface without ads
| - No sign-up or clutter required
- Full transparency showing how calculations are derived
- Every calculator tested against worked examples before launch
- Privacy-first with calculations done entirely in browser
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 12 | 11 |
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| Referring domains (Majestic) | 3 | 3 |
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VoltReflex