| What it does | Free online calculators with step-by-step workings and cited sources, embeddable on any website
| Date, deadline and time calculators with visible assumptions and sources
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| Stage | Startup
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| Founded | 2026
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| Based in | GB
| US
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| Pricing model | Freemium
| Free
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| Pricing | Free plan: all calculators with ads, 5 saved calculations, 1 private link. Personal: $29 USD/year or $5/month with unlimited saved calculations, no ads, PDF and CSV export. Advisor: $149 USD/year or $19/month with client-facing branding, scenarios grouped by client, one PDF per client, and priority
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| Key features | - 1,336 calculators across 23 categories
- Step-by-step calculation workings shown live
- Cited sources on every calculator page
- Save and compare scenarios side by side
- Embed calculators on your website with three lines of code
- Update shared figures once across all embeds
- Export results as PDF or CSV
- Reusable assumption profiles
- Private read-only links with expiration
- Client management and reporting 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
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| What makes it different | - Visible calculation working for every result, so you can inspect the math rather than trust blindly
- Every calculator declares its method and sources in code with checked examples
- Free embedding with your own branding and no tracking of readers
- Similar calculators are consolidated to one preferred page to avoid duplicate search results
| - 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) | 23 ▼ −1 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 24 | 0 |
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| Citation Flow (Majestic) | 34 | 0 |
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| Referring domains (Majestic) | 88 | 0 |
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CalculatorFox
CalcSpan