What this page proves
BoringToolsKit is moving from trust claims to visible operating evidence: formula notes, assumptions, source links, regression tests, browser QA, and correction paths.
Quality evidence
Quality Evidence
How BoringToolsKit proves formulas, sources, testing, corrections, and commercial independence.
Current public checks
- Site contract tests run before production deployments.
- Important calculators include formulas, examples, assumptions, related tools, and review dates.
- Portable actions share page URLs by default, not hidden inputs.
- Ad and sponsor modules fail closed unless real credentials are configured.
Known limits
Some legacy tools still need deeper interpretation, scenario comparison, and more tool-specific source evidence. We are prioritizing high-stakes financial, health, generator, and energy tools first.
How to challenge a result
Use the correction page to report a stale rate, wrong formula, missing assumption, accessibility issue, or unclear result. A trustworthy calculator site should make corrections easy.