| What it does | Not given
| Test your visual reaction time for free
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Dictionary-based counting using 126,044-word CMU Pronouncing Dictionary
- Estimated word flagging with spelling-based fallback
- Per-line syllable counts for poetry forms
- Haiku (5-7-5), tanka (5-7-5-7-7), cinquain (2-4-6-8-2) presets
- Readability metrics: syllables per word and per sentence
- Live syllable count as you type
- Text and CSV export options
- Share links with text in URL fragment
- Runs entirely in browser with no server uploads
- Word lists for one through six-syllable words
| - 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 | - Tells you which counts are exact dictionary lookups and which are spelling-based estimates
- Per-line syllable counts with deviation indicators for poetry
- All processing happens in your browser with no data sent to servers
- Built by a single developer with no ads, accounts or funding
| - 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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| Platforms | 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) | Not checked yet ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 17 | 11 |
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| Referring domains (Majestic) | 2 | 1 |
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Syllable Counter
ReactionTests