How We Build and Test These Tools

Toolsque is a small independent site. Every calculator, generator, and guide here is built by hand, tested before release, and kept free. This page explains exactly how that works, so you can judge whether to trust the numbers.

Everything runs in your browser

Our QR and barcode tools generate their output on your device. The WiFi passwords, payment handles, contact details, and product codes you type never leave your computer or phone. There is no upload step and no account. The generator libraries we use are open source (MIT licensed) and self-hosted on our own server, so the tools keep working even if a third party CDN goes down.

Where the formulas come from

Calculators on this site do not invent their math. Each one is built from a published source and the page names it where it matters:

  • QR code capacity, error correction, and sizing rules follow the ISO/IEC 18004 standard.
  • Barcode formats (Code 128, EAN-13, UPC-A, Code 39, ITF-14) follow GS1 structure rules, including check digit math. Our pages are direct about what a generated barcode can and cannot do: internal tracking works instantly, retail sale through a distributor requires GS1 registration.
  • Construction calculators use published span tables, coverage rates, and material densities, and every page states its assumptions next to the result.
  • Finance and tax calculators use current published rates (for example GSA per diem tables and IRS rules) and state the year they apply to.

How tools are tested before release

A tool does not go live because it looks finished. It goes live when it passes checks:

  • Every QR generator output is decoded with an independent scanner library before launch. Our logo and color QR tools were released only after their output decoded correctly across shapes, color templates, brightness levels, and error correction settings in dozens of combinations.
  • Calculators are traced with worked examples by hand. When a result disagrees with the source table, the tool is fixed before it ships. Real example: our loft head height calculator was rebuilt during testing because it measured floor area from one dimension instead of two.
  • Pages are re-checked after launch. When we find an error, we fix it and the Last updated date on the page reflects it.

What these tools are not

Results here are planning estimates, not professional advice. A span table result is not an engineering sign-off, a tax estimate is not a filing, and a cost range is not a quote. For decisions with legal, structural, or tax consequences, verify with a licensed professional in your area. Our pages repeat this warning wherever it applies.

Found a mistake?

Tell us through the contact page. Error reports get priority over everything else on our build list: a wrong number on a live page is the worst bug this site can have. If you tell us which tool and which inputs produced the bad result, we can usually reproduce and fix it within days.