| What it does | Date, deadline and time calculators with visible assumptions and sources
| Break-even ROAS calculator with tariff-aware landed cost for ecommerce
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| Stage | Not given
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| Founded | Not given
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| Based in | US
| HK
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| Pricing model | Free
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| Pricing | Not given
| Free: all eleven calculators unlimited, no account required. Pro: $19 per month or $190 per year (two months free).
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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
| - Tariff-aware break-even ROAS calculation including 2026 US import duties
- Scenario modeling for price and tariff rate changes
- Tariff alerts when policy rates change
- CSV export of SKU profiles
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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
| - Free tool with no signup required; all calculators stay free forever
- Tariff calculations verified and dated; rates sourced from official sources with HTS code accuracy
- Accounts for all hidden costs that platform ROAS does not include
- Flat monthly pricing with no per-order fees that scale with revenue
- Formulas fully transparent and printed in full; no proprietary model withheld
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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 | 1 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 2 |
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| Citation Flow (Majestic) | 0 | 24 |
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| Referring domains (Majestic) | 0 | 9 |
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CalcSpan
RoasFloor