| What it does | Free online reaction time test that measures your reflex speed in milliseconds
| Free Erlang C calculator for contact center staffing and service level planning
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| Stage | Not given
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| Founded | Not given
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| Based in | US
| ES
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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
| - Calculates minimum agents needed for service level targets
- Erlang C probability and queuing formulas
- Computes average speed to answer (ASA)
- Shows agent occupancy and utilization
- Generates comparison table of agents and metrics
- CSV export for Excel analysis
- Embedded iframe version for websites
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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
| - No registration required, runs in browser without sending data
- Preset buttons for Spain's Law 10/2025 compliance targets
- Based on ITU-T E.600 recommendation and ITU-D teletraffic engineering
- Uses stable numerical recursion method for any agent count
- Completely free with no advertising when embedded
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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 | 4 |
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| Referring domains (Majestic) | 3 | 3 |
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VoltReflex
CallsIQ