| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Free online calculators for finance, health, salary, loans, and everyday decisions
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| Stage | Not given
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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
| - Amortization calculator with extra payment options
- Salary converter across 8 pay frequencies
- Mortgage calculator with taxes, insurance, PMI and HOA
- Compound interest calculator with monthly contributions
- Metric and imperial unit toggles
- Offline support via progressive web app installation
- Step-by-step guides explaining calculator formulas
- Mobile responsive design supporting 320px phones
- Nine language translations with right-to-left support
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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
| - Every calculator shows its formula and worked example so results can be verified
- All calculations run locally in browser with no data collection or account required
- Formulas traced to primary sources and tested against boundary cases before publication
- Independent editorial team accountable for accuracy with no guest posts
- Corrections treated as normal work with public revision dates
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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 | 1 |
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| Citation Flow (Majestic) | 12 | 15 |
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| Referring domains (Majestic) | 3 | 3 |
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VoltReflex
Miryori