AllYouNeed is an independent project run by one developer. This page describes how the tools and content actually get built — what runs in your browser, how each tool is verified, and what the site does and doesn't do.

What runs in your browser

Every tool on this site runs entirely client-side: the inputs you type and any files you load are processed in your browser and never reach a server. There is no upload step, no account, no server-side computation in the tool path.

Ads come from Google AdSense (publisher ID ca-pub-8761907366448308). AdSense uses cookies and shares limited data with Google's ad network when you consent. The cookie banner is a real consent gate: AdSense scripts do not load until you accept. If you decline, no ad cookies are set. Ad slots are clearly marked Sponsored.

What's on the site

AllYouNeed mixes several tool categories on one domain — utility calculators, text and unit utilities, date/time tools, fitness calculators (BMI, TDEE, body fat, water intake, ideal weight), QR codes, developer cheatsheets, and basic format converters. Each category has different requirements; the bar applied below adapts to each.

How tool reliability is verified

Every tool is covered by an automated end-to-end test that runs on every deploy. The "Last verified — N tools passing" line in the footer is set by CI: it reflects the date of the last green run and the count of tools that passed. If a test breaks, the footer reflects that on the next build, and the broken tool is fixed before the line goes back to all-passing.

How content is written

Tool interfaces, formulas, and the algorithms behind each tool are written and verified by hand against primary sources (RFCs for encoding, ISO standards for units, peer-reviewed papers for fitness formulas, vendor specs for OS-specific cheatsheets).

Long-form guides under /docs/ are drafted with AI assistance and lightly reviewed before publishing. The technical facts in those guides — what an RFC says, how a formula derives — are independently verifiable.

Comparison pages ("X vs Y") were previously published with light review. Those pages have been removed because the project couldn't maintain the factual bar they required without becoming a competitor-review site, which isn't what AllYouNeed is. If a comparison page redirected you here, please use the actual products to compare them.

What the site doesn't do

• Paid placements, sponsored editorial, or guest posts. AdSense ads are clearly marked Sponsored and separate from editorial.
• Paraphrase competitor blog posts.
• Make health claims dressed up as advice. Fitness calculators are calculators; each names what it is not for.

Fitness content

Fitness calculators cite the source formula with year of publication and primary author where applicable. TDEE uses Mifflin-St Jeor (1990); body fat uses Deurenberg (1991), US Navy / Hodgdon-Beckett (1984), and Gallagher et al. (2000); ideal weight uses Robinson (1983), Miller (1983), Devine (1974), and Hamwi (1964); water intake uses the European Food Safety Authority recommendation (~33 ml/kg). BMI is the WHO screening formula.

Every fitness page carries a shared educational disclaimer; tools touching sensitive contexts add specifics — kidney disease and pregnancy for water intake, eating disorders for calorie tools, athletic body composition for BMI.

How content stays current

When a regulation, RFC, or vendor spec changes in a way that affects a tool, the affected page is updated. The CI test suite catches behavioral regressions on every deploy, and visible errors are fixed on the next deploy.

Reporting errors

If you spot a factual error, a broken tool, a missing citation, or content that's outdated, email support@allyouneed.dev. The operator typically replies within 24 hours on weekdays. Substantive corrections are published with a Corrected YYYY-MM-DD note next to the affected paragraph.

Funding and monetization

AllYouNeed accepts no payment for tool listings, no affiliate revenue, and no sponsored editorial content. Monetization is via Google AdSense display ads (where approved) and occasional Buy Me a Coffee tips. Ad slots are clearly marked Sponsored and separate from the rest of the page.