| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Free calculators and guides for business, marketing, SaaS, ecommerce, real estate, restaurants and software 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
| All calculators are free to use with no signup required. Optional paid features available after signing in to save and download reports.
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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
| - 42 free calculators across ROI, marketing, SaaS, ecommerce, real estate, restaurant and software categories
- Transparent formulas with explanations and examples for each calculation
- Decision-focused results emphasizing practical metrics like ROI, ROAS, profit, margin, payback, CAC and LTV
- Browser-based calculations with optional account signup to save and export reports
- Downloadable and printable reports in multiple formats including PDF, CSV and images
- Practical guides accompanying each calculator with assumptions and business context
- Responsive design optimized for phones, tablets, laptops and desktops
- Popular calculators including SEO ROI, Google Ads ROI, SaaS LTV:CAC, MRR, ARR and NRR metrics
- Covers multiple business use cases including marketing, SaaS, ecommerce, real estate and restaurants
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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
| - Clear explanations and context instead of just numbers from calculators
- No signup required for basic calculator use
- Consistent interface across all calculators designed for real business decisions
- Educational content showing assumptions and examples for each calculation
- Brings scattered business metrics into one unified platform
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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 | 2 |
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| Citation Flow (Majestic) | 12 | 8 |
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| Referring domains (Majestic) | 3 | 6 |
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VoltReflex
SolveIndex