| What it does | Free online countdown timer with custom sounds, themes, and sharing
| Date, deadline and time calculators with visible assumptions and sources
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| US
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Custom duration and end time settings
- Multiple sound alert options
- Fullscreen mode for focused display
- Shareable timer links
- Keyboard shortcuts for quick control
- Mobile optimized responsive design
- Saved preferences between sessions
- Browser notifications
- Up to 24 hour timer duration
- Popular preset timers
| - 184 calculators across 53 categories
- Shows counting rules and assumptions with each result
- Local-first processing with no data sent to servers
- Holiday and weekend calendar selection
- Business day counting
- Date arithmetic (add or subtract days, weeks, months, years)
- Sleep cycle planner with NIH-based 80-100 minute cycles
- Time zone conversion with DST handling
- Save results as images or add to calendar
- Schengen visa 90/180 day rolling window auditing
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| What makes it different | - Completely free with no hidden costs or premium features
- No registration or personal information required
- Privacy focused with no tracking or data collection
- Works on all devices without downloads or installations
- Shareable timer links for collaborative timing
| - Shows the source and counting rule beside every answer
- No sign-up or account required to use any calculator
- All inputs stay in your browser for privacy
- Comprehensive coverage across 53 life and work categories
- Higher-risk calculators include prompts to verify with professionals
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 14 ▼ −1 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 18 | 0 |
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| Citation Flow (Majestic) | 21 | 0 |
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| Referring domains (Majestic) | 487 | 0 |
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CalcSpan