| What it does | Independent calculator to check if a home battery pays for itself in your situation
| Free online calculators and tools that run entirely in your browser
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| Stage | Not given
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| Founded | Not given
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| Based in | NL
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 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
| - Paycheck calculator for all 50 US states and DC
- 2025-2026 tax deduction calculators for overtime, tips, and charitable giving
- PDF to Word converter with scanned page support
- Mortgage and auto loan calculators
- Image resizing, format conversion and compression tools
- JSON formatter and validator
- Retirement and investment calculators
- Everyday calculators for time, measurements and fitness
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| What makes it different | - 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
| - All tools run entirely in browser with no server upload
- No signup, download or installation required
- Over 100 free calculators and tools with no watermarks or ads on results
- Updated daily to reflect new tax laws and government guidance
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 15 ▼ −1 (down) since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 2 |
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| Citation Flow (Majestic) | 24 | 26 |
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| Referring domains (Majestic) | 18 | 45 |
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Tools Berry