| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Free online calculators and unit converters for finance, health, and everyday calculations
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| Stage | Not given
| Established
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| Founded | Not given
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| Based in | US
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| Pricing model | Free
| Free
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| Pricing | 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
| - BMI and health calculators
- EMI and loan payment calculators
- Compound interest and investment projections
- US mortgage calculator with amortization tables
- TDEE and calorie calculators
- Currency converters with live exchange rates
- Embeddable calculator widgets for publishers
- Browser-based calculations for privacy
- Transparent formulas and source documentation
- Country-specific tax and payroll tools
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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
| - Instant private results stored in browser only
- Transparent formulas and assumptions visible for every calculation
- Over 997 free tools with no account required
- Source-backed reference data and country-specific tools
- Embeddable widgets for educators and publishers
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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 | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 12 | 19 |
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| Referring domains (Majestic) | 3 | 5 |
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VoltReflex
Calxo AI