Independent review brief

What ProjectQty is

ProjectQty provides browser-based quantity calculators and local project guides for U.S. DIY planning. It exposes formulas, assumptions, rounding, source scope, and limitations. It does not provide live supplier quotes, permits, structural design, construction plans, or professional approval.

Review protocol

1. Reproduce the five published validation cases from their exact inputs and compare each intermediate value and final rounding step.
2. Inspect the related calculator formulas, defaults, editable assumptions, ordering rules, and stated limitations.
3. Trace external facts to the source register and keep every conclusion within the named product, version, date, and claim scope.
4. Cross-check product-specific yield, coverage, density, package size, and local requirements against the reviewer's chosen current supplier documents.
5. Publish failures, limitations, and unresolved questions alongside successful reproductions, and disclose any affiliation or compensation.

Reproducible evidence

• Calculation validation — five exact first-party test cases with intermediate values.
• Concrete calculator — enter 10 ft × 10 ft × 4 in and 10% waste to reproduce 1.3580 yd³ and 62 bags.
• Decking calculator — inspect board coverage, waste, and whole-unit ordering.
• Methodology — geometry, unit conversion, waste, yield, pricing, and rounding rules.
• Source register — authority, scope, review dates, and evidence status.
• Privacy — browser-local project data and production analytics boundaries.

What an independent review should report

• The pages, calculator versions, inputs, units, and source records inspected.
• Which results reproduced exactly, which differed, and enough detail to repeat each finding.
• Any usability, accessibility, privacy, source-scope, or limitation-language concerns.
• The review date, reviewer identity or organization, methodology, conflicts, and compensation.