| What it does | Beautiful flip clock online with smooth flip animations, fullscreen mode, and customizable themes
| Test your visual reaction time for free
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Large flip-style numbers easy to read from across the room
- Fullscreen mode for distraction-free display
- 12-hour and 24-hour time format switching
- Show or hide seconds on demand
- Customizable background and font colors
- Multiple premium theme designs with distinct materials and colors
- Local browser storage for settings persistence
- Responsive design for all devices
- No registration or account required
| - Five-round visual reaction test with millisecond timing
- Seven-round sound reaction time test
- Local result history with up to 300 sessions stored
- Consistency measurement showing standard deviation of scores
- Download score card as image
- Sound calibration for personal offset adjustment
- Reference data from published research studies
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| What makes it different | - Completely free with no registration or account needed
- Works instantly in any modern browser without download or installation
- Large, distraction-free display suitable for viewing from across the room
- Premium theme designs with distinct materials and visual aesthetics
- Customizable themes and background options with local browser storage
| - No account or login required to use the test
- Results stored locally in browser for privacy
- Compare full sessions to understand consistency, not just fastest round
- Research-backed reference data from laboratory studies
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| Free plan | Not given
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| Open source | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 15 ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 5 | 0 |
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| Citation Flow (Majestic) | 19 | 11 |
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| Referring domains (Majestic) | 27 | 1 |
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FlipClock
ReactionTests