| What it does | Free tools for PDFs, photos, and everyday calculations
| Test your visual reaction time for free
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| Pricing model | Free
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| Pricing | Not given
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| Key features | - Edit PDFs with text, white-out, highlights, shapes and images
- Compress and shrink PDFs under a size limit
- Merge multiple PDFs in chosen order
- Remove photo backgrounds at full resolution
- Convert iPhone HEIC photos to JPG
- Extract text from images using OCR
- Generate invoices as PDFs
- Calculate timesheet hours with overtime
- Calculate concrete requirements for projects
- Pet toxicity checkers for chocolate and xylitol
| - 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 | - Files never uploaded to servers; processing happens in browser
- No sign-up, account or daily limits required
- Calculators show their working and formulas
- 107 tools covering money, DIY, auto, PDF, images, pets and daily life
- No file size limits, only device memory constraint
| - 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) | 3 ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 4 | 0 |
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| Citation Flow (Majestic) | 18 | 11 |
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| Referring domains (Majestic) | 2 | 1 |
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FixnFigure
ReactionTests