AI-citation readiness, measured
AI-Citation Readiness: BoringToolsKit vs Top Calculator Sites
An observed comparison of the signals AI systems use to cite pages: llms.txt, structured data, answer blocks, and verified facts. All checks were run against live pages on 2026-08-27.
BoringToolsKit Editorial Team · Aug 2026
The signal matrix
| Site | llms.txt | Article schema | WebApplication | FAQPage | Answer blocks | Key facts | Words / tool page |
|---|---|---|---|---|---|---|---|
| BoringToolsKit | Yes (3.3 KB + llms-full) | Yes + image | Yes | Yes | Yes, 294 pages | Yes | ~1,000 |
| calculator.net | No | No | No | No | No | No | ~6,100 |
| Omni Calculator | Yes | Yes | No | No | Partial | No | ~4,500 |
| Calculator.io | No | No | Yes | Yes | Partial | No | ~8,600 |
| CalculatorSoup | Yes | No | Yes | No | No | No | ~570 |
| PercentageCalculator.org | No | No | Yes | Yes | No | No | ~950 |
| UnitConverters.net | No | No | No | No | No | No | ~540 |
The matrix samples each site's homepage and a representative tool page (mortgage or percentage calculator). "Answer blocks" means a direct numeric answer stated in plain text near the top of the tool page; "Key facts" means a short citable list with named sources.
What the comparison shows
- BoringToolsKit is the only site that combines every signal: llms.txt, Article schema with images, WebApplication, FAQPage, verified answer blocks on all 294 content pages, and key facts with named sources (NIST, Investor.gov, FDIC, BLS, EIA).
- calculator.net publishes the most raw words (~6,100 per tool page) with zero structured data - long pages that AI systems have little structured material to quote.
- Calculator.io is the strongest raw competitor: ~8,600 words, FAQPage, and WebApplication schema, but no llms.txt or Article schema.
- Omni Calculator is the closest GEO rival: llms.txt, Article schema, and HowTo markup, but no FAQPage or key facts.
- Most other large calculator sites (CalculatorSoup, UnitConverters, PercentageCalculator.org) carry thin content and minimal schema.
Why this matters for AI search
AI assistants cite pages they can parse cleanly: a direct answer, structured markup, and named sources. A page with 6,000 words and no structure is harder to quote than a page with 1,000 words, a checked answer block, and key facts. BoringToolsKit's answer blocks are arithmetic-verified against each tool's published formula, and every key fact carries a source parenthetical.
Method and limits
All checks were run programmatically against live pages: HTTP fetch, schema scanning for FAQPage/Article/WebApplication/HowTo JSON-LD, llms.txt probe at the site root, and word-count of rendered text. The sample covers one representative tool page per competitor; sitewide coverage varies. This is observational research, not an endorsement or a guarantee of AI citation.