| What it does | Free online tools for images, photos, calculators, QR codes, and CVs — no signup, no uploads
| 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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| Pricing model | Free
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| Pricing | Not given
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| Key features | - Image compression to exact KB targets
- Passport photo cropping with country presets
- Loan calculator with amortization schedules and Excel export
- QR code generation for WiFi, vCard, and PDF links
- Image resizing for exact pixels
- ATS-friendly CV builder with PDF download
- Photo and signature merger for exam forms
- PDF compression and image-to-PDF conversion
- Image format conversion including HEIC, WebP, and SVG
- Color converter for HEX, RGB, and HSL codes
| - 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 processing runs in your browser with zero file uploads or server storage
- Real-time results without queues or processing screens
- Works on any device with no app installation or account required
- Specialized presets for specific Indian exams and job portals
| - 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) | 5 ▼ −1 (down) since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 6 | 0 |
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| Citation Flow (Majestic) | 22 | 11 |
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| Referring domains (Majestic) | 25 | 1 |
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Kodotools
ReactionTests