| What it does | Free Coast FIRE calculator to estimate your retirement savings milestone
| Free online reaction time test that measures your reflex speed in milliseconds
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| Stage | Startup
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| Founded | 2026
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| Based in | Not given
| US
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Calculate invested assets needed today for Coast FIRE milestone
- Interactive calculator with real-time updates as you edit inputs
- Compare multiple contribution scenarios with projected retirement assets
- Explore return assumptions with sensitivity analysis
- Five related FIRE calculators: Coast, Barista, Fat, Lean, and FIRE Number
- Customize metro area budget or enter your own annual spending
- Transparent formulas and documented verification checks
- All calculations performed in browser with no data uploads
| - 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
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| What makes it different | - Free with no account required and calculations run entirely in your browser
- Transparent assumptions with linked original research and sources
- Deterministic scenarios and educational model focused on inspection and understanding
- Multiple complementary calculators for different retirement planning questions
- Public correction process and documented model updates
| - 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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 6 ▼ −1 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 10 | 0 |
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| Citation Flow (Majestic) | 20 | 12 |
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| Referring domains (Majestic) | 12 | 3 |
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