| What it does | Free technical tools for website diagnostics
| Free JSON API for construction calculators with test vectors and building codes
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Open source
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| Pricing | Not given
| Free under CC BY 4.0 licence
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| Key features | - DNS record queries across four public resolvers
- SSL certificate chain validation with expiry dates
- WHOIS and RDAP domain lookups
- IP WHOIS lookups for network information
- Core Web Vitals and speed testing
- Uptime and reachability checks from multiple regions
- Redirect chain tracing
- Raw data transcripts for verification
- WordPress theme and plugin detection
- Domain name generator with availability checking
| - 1,173 construction calculators with full inputs and test vectors
- 3,485 published test vectors for validation
- No authentication key or rate limits required
- Citations to building standards with section numbers
- Executable API for running calculations on request
- MCP server integration for AI assistants
- 79 job takeoffs with calculator sequences
- Cross-market glossary in US, Canadian, UK and Australian usage
- Corrections ledger tracking confirmed errors
- Unit conversion with exact statutory factors
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| What makes it different | - Every result shows raw data and working so users can verify findings themselves
- No signup, no email gates, no trials required
- Measurements are real live lookups, never estimates or guesses
- Affiliate commissions only on findings, never on page loads or passing results
- Dense, specific documentation written for developers and technical users
| - No API key required with no rate limits or quotas
- CC BY 4.0 licence allows commercial use and redistribution
- Every calculation cited to specific building code sections
- Pinned test cases prevent silent changes to published figures
- Complete accessibility with CORS support for browser use
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet |
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| Trust Flow (Majestic) | 5 | 0 |
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| Citation Flow (Majestic) | 7 | 26 |
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| Referring domains (Majestic) | 3 | 29 |
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Craft Quantities