| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Free FIRE financial planner with Monte Carlo simulation and historical backtesting
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| Stage | Not given
| Established
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| Founded | Not given
| 2019
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| Based in | 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
| - Monte Carlo simulation with up to 5,000 runs
- Historical backtesting against every market period since 1872
- US federal, state and payroll tax calculations for all 50 states
- Roth conversion ladder and RMD planning
- Six stress tests including market crash and job loss
- Three withdrawal strategies with 59.5 rule enforcement
- Support for 9 asset types with individual growth rates
- Month-by-month income and expense modeling with custom timelines
- Life event planning
- 9-currency support with auto-detection
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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
| - Runs entirely in your browser with no account needed or data stored on servers
- Tests retirement against 154 years of historical market data since 1872
- Calculates exact tax liability for all 50 US states plus federal and payroll taxes
- Completely private with no data collection, selling or sharing
- Works offline on Android with full planner functionality
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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 | 12 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 4 |
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| Citation Flow (Majestic) | 12 | 34 |
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| Referring domains (Majestic) | 3 | 127 |
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VoltReflex
firenum™