| What it does | Daily score tool for measuring productive time and planning your workday
| 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 | Not given
| NL
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Productivity Score calculation from work and productive time
- Perfect End Time planning with billable minutes and productivity targets
- Advanced options for meeting time, distraction tracking, and deep work analysis
- Productivity levels and interpretation guidance
- Local browser storage with Remember my settings option
- Support for multiple use cases including therapy, studying, and team planning
- Calculator library with nine specialized tools
| - 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 | - No sign-up required to use the calculator
- Transparent methodology with formulas shown in the tool
- Inputs processed in browser for privacy
- Practical focus on real-world metrics over generic advice
| - 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) | 25 ● no change since last check | 16 ● no change since last check |
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| Trust Flow (Majestic) | 7 | 18 |
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| Citation Flow (Majestic) | 27 | 24 |
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| Referring domains (Majestic) | 44 | 18 |
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Productivity Calculator
Eerlijk over Thuisbatterijen