| What it does | Free online tools to convert files, calculate values, generate codes and transform text in your browser
| 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 | BR
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Compress and convert images (JPG, WebP, PNG)
- Merge, split and convert PDF documents
- QR code generator for text, links, Wi-Fi, Pix, vCard and SMS
- Word and character counter with real-time processing
- JWT decoder showing header, payload and expiration
- Compound interest calculator with monthly contributions
- Color picker showing HEX, RGB and HSL values
- Unit converters for length, temperature and more
- Video compression by selecting resolution and quality
- Freelance hourly rate calculator for income goals
| - 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 | - All tools run entirely in your browser with no file uploads or server processing
- Fast results with instant processing directly in your browser
- No sign-up required with no hidden limits or paywalls
- Available in three languages with localized units and formats
- Regularly updated catalog with new tools added continuously
| - 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) | 21 | 11 |
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| Referring domains (Majestic) | 5 | 1 |
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Kastavo
ReactionTests