| What it does | Date, deadline and time calculators with visible assumptions and sources
| Free random name picker powered by cryptographic randomness
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| Stage | Not given
| Startup
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| Founded | Not given
| 2026
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| Based in | US
| Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
| Free forever with no paywalls or hidden fees.
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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
| - Cryptographically secure randomness using crypto.getRandomValues()
- Equal probability for all entries
- Remove and spin again functionality
- Recent Winners log tracking all decisions
- Built-in fairness test with 10,000 simulated spins
- No account or download required
- Works on any modern browser
- Client-side application with no data transmission
- Unlimited entries with auto-resizing segments
- Multiple wheel configurations for different use cases
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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
| - Uses cryptographic randomness instead of predictable algorithms like Math.random()
- Built-in fairness verification test that runs 10,000 spins to prove equal distribution
- Completely private with no data stored on servers or shared with third parties
- Instant results with no signup, download, or hidden costs
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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 | 4 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 14 |
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| Referring domains (Majestic) | 0 | 3 |
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CalcSpan
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