| What it does | Free Coast FIRE calculator to estimate your retirement savings milestone
| Free on-screen ruler and measuring tools with calculators
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| Stage | Startup
| Startup
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| Founded | 2026
| 2026
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| Based in | Not given
| AE
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| Pricing model | Free
| Free
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| Pricing | Not given
| Free tools; RulerNest Pro (ad-free version with saved calibrations) coming soon with no pricing announced yet.
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| Key features | - Calculate invested assets needed today for Coast FIRE milestone
- Interactive calculator with real-time updates as you edit inputs
- Compare multiple contribution scenarios with projected retirement assets
- Explore return assumptions with sensitivity analysis
- Five related FIRE calculators: Coast, Barista, Fat, Lean, and FIRE Number
- Customize metro area budget or enter your own annual spending
- Transparent formulas and documented verification checks
- All calculations performed in browser with no data uploads
| - On-screen ruler calibrated with bank card to 0.5 mm precision
- Unit converter for length, weight, temperature, area, volume
- BMI calculator with WHO bands
- Loan and EMI calculator with interest schedule
- Printable ruler for A4 and Letter paper
- No data collection or email required
- Offline access via service worker
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| What makes it different | - Free with no account required and calculations run entirely in your browser
- Transparent assumptions with linked original research and sources
- Deterministic scenarios and educational model focused on inspection and understanding
- Multiple complementary calculators for different retirement planning questions
- Public correction process and documented model updates
| - All calculations performed locally with no data sent to servers
- 23 specialized tools all in one place for measuring and everyday calculations
- Works offline and saves preferences locally on your device
- Designed specifically for United States and Canada with Imperial units as default
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 6 ▼ −1 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 10 | 0 |
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| Citation Flow (Majestic) | 20 | 0 |
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| Referring domains (Majestic) | 12 | 0 |
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