| What it does | Date, deadline and time calculators with visible assumptions and sources
| Free construction, trades and industrial calculators that work offline
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| Stage | Not given
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| Founded | Not given
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| Based in | US
| AE
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 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
| - 130+ specialized calculators for construction and trades
- Instant imperial and metric unit toggling
- Calculations aligned to verified industry standards
- Zero tracking and complete privacy on calculations
- Real-time material pricing index for concrete, lumber, and rebar
- Custom B2B calculator embedding and white-label licensing
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| What makes it different | - 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
| - Engineering-grade accuracy citing primary standards like ASTM and ISO
- Dual-market architectural support for US and GCC specifications
- Complete client-side processing with zero external data transmission
- No setup, registration, or login requirements
- Transparent calculation methodology with published test vectors
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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 | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 13 |
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| Referring domains (Majestic) | 0 | 1 |
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CalcSpan
buildercalc