| What it does | Free online calculators, converters, and developer tools that run in your browser
| Free personal finance calculators that show the real math behind the number
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| Stage | Startup
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| Founded | 2025
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 68 free tools across finance, development, and utilities
- Loan repayment and affordability calculators with total interest calculations
- Currency converter with 30 world currencies and live exchange rates
- JSON formatter, validator, and minifier with syntax highlighting
- Date and time tools including age calculator and timezone converter
- Runs entirely in browser with no server uploads
- Works offline after initial page load
| - Debt Snowball vs. Avalanche calculator
- Student Loan Repayment calculator
- Credit Card Payoff Calculator
- Compound Interest Calculator
- Mortgage Refinance Calculator
- Retirement Catch-Up Calculator
- 401(k) Early Withdrawal Calculator
- 50/30/20 Budget Calculator
- Emergency Fund Calculator
- Hand-verified formulas with plain-English explanations
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| What makes it different | - No account or sign-up required
- Runs entirely client-side in your browser with no data sent to servers
- All tools are completely free with no usage limits
- Works offline after initial page load
- Privacy-first approach with no data collection or transmission
| - Shows the actual math behind each calculation instead of a black box
- Every formula is hand-verified before publishing
- No signup, email wall, or spreadsheet download required
- Official figures checked directly against government sources
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 7 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 3 | 0 |
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| Citation Flow (Majestic) | 35 | 17 |
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| Referring domains (Majestic) | 6 | 1 |
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TheCalcNerd