| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Ultra-marathon nutrition calculator for race-day fuelling
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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
| Freemium
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| Pricing | Not given
| Free account with demo calculator and one saved plan. Pro is €13 EUR once per plan for aid-station planner, race-day forecast, sharing, PDF, race-week reminder and learning from past race.
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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
| - Carbohydrate, fluid and sodium calculations per hour based on weight, effort and weather
- Fuel ideas in gels, chews, drink mix or real food with mixed strategy options
- Aid-station planner with up to 60 stations and drop-bag lists
- GPX file import for race route and waypoints
- Race-day forecast with heat-index adjustments
- Hour-by-hour race plan table with night-race adjustments
- Shareable private links to share plans with crew
- Printable PDF of the complete race plan
- Race-week reminder by push or email with key numbers
- Post-race review to learn from past races
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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
| - Demo calculator requires no account and sends nothing to the browser
- One-time €13 EUR payment per plan with no subscription
- Personalised calculations based on published sports-nutrition ranges scaled to your weight and conditions
- Plans are private by default with revocable sharing links
- No ad trackers and ability to delete all personal data
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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 | 0 |
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| Referring domains (Majestic) | 3 | 0 |
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VoltReflex
UltraCalcPal