| What it does | Free financial calculators for mortgages, loans, savings, and retirement
| Independent calculator to check if a home battery pays for itself in your situation
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| Stage | Not given
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| Founded | Not given
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| Based in | FR
| NL
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| Pricing model | Not given
| Free
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| Pricing | Not given
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| Key features | - How Much House Can I Afford calculator
- Rent vs. Buy comparison
- Mortgage payoff calculator
- Debt payoff strategies
- Compound interest calculator
- FIRE Number retirement calculator
- Refinance break-even analysis
- Student loan payoff calculator
- Emergency fund calculator
- Amortization schedule generator
| - Compares battery models from 23 brands on payback time and net result after 15 years
- Calculates with real hourly EPEX prices for dynamic energy contracts
- Processes the end of net metering from 1 January 2027
- Provides negative buying advice if purchase is not worthwhile
- No account or email required
- Generates 10-page PDF advice report with lowest prices from 11 shops
- Free 22-page PDF handbook about home batteries
- Analyzes consumption and solar generation hour by hour for full year
- Three scenarios: pessimistic, most likely and optimistic outcomes
- Updates prices from 11 online shops every morning automatically
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| What makes it different | - Transparent assumptions displayed next to every result
- No sign-up or account required
- Calculators run in browser without sending data to servers
- Accessible explanation of financial decision reasoning
| - Truly independent: sells no batteries, has no arrangements with installers, publishes negative buying advice
- No personal data collection: zero signup required, immediate results without email
- Built from personal need: creator did his own calculations after a misleading sales pitch
- Comprehensive research: 384 example households analyzed in 26,112 calculations
- Shows all calculation assumptions: transparent methodology with public data sources
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ▼ −1 (down) since last check | 16 ● no change since last check |
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| Trust Flow (Majestic) | 9 | 18 |
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| Citation Flow (Majestic) | 19 | 24 |
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| Referring domains (Majestic) | 18 | 18 |
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