Editorial policy
This page documents how a tool gets onto Tools Guru, how we verify that it produces the right answer, and what happens when it does not.
Who writes what
All tool logic, page copy and documentation on this site is written by the Tools Guru editorial team — the same three engineers and writers who build the software. We publish no guest posts, no sponsored articles and no syndicated content. There is no AI-generated filler: text is drafted by a person, and any research assistance is fact-checked against a primary source before publication.
How a calculator is sourced
Every tool that implements a formula is built from a primary source, not from another website. In practice that means a standards body, a regulator, a peer-reviewed publication or the official documentation of a file format. Examples: body mass index categories follow the World Health Organization classification; the UUID generator follows RFC 4122; hashing uses the browser's native Web Crypto implementation rather than a hand-written one; PDF handling uses PDF.js and pdf-lib; the body fat estimate uses the published US Navy circumference method.
How it is verified before release
- The formula is implemented from the primary source and the source is recorded.
- Output is checked against at least one independent reference implementation across a spread of inputs, including boundary values and deliberately awkward ones — zero, negative numbers, very large numbers, leap days, daylight-saving transitions.
- The tool is exercised by keyboard alone and with a screen reader to confirm it is operable without a mouse.
- It is tested on current Chrome, Firefox, Safari and Edge, on both desktop and mobile, and with a content blocker enabled.
- Where a tool touches money or health, a plain-language limitation notice is written for the page and added to the disclaimer.
Review schedule
Every tool page carries a visible "last reviewed" date. Finance and health tools are re-reviewed at least twice a year, or immediately if an underlying rate, threshold or guideline changes. All other tools are reviewed annually. A review means re-running the verification steps above, not merely bumping the date — if the date moved, the checks were done.
Corrections
A calculation that returns the wrong number is the most serious defect we can ship, and it is handled ahead of every other kind of work. Reported errors are reproduced, usually within one working day. When a confirmed error is fixed, we say so on the affected tool page rather than quietly amending it. To report one, email sophiaanjum05@gmail.com with the inputs you used and the result you expected.
Advertising and independence
Tools Guru is funded by display advertising from a third-party network, plus aggregate analytics. Advertising is clearly delineated from content and is loaded only after the page has rendered. We accept no payment for placement, ranking, links or favourable mention, we run no affiliate links, and no advertiser sees or influences editorial content before publication. If that ever changes, it will be disclosed on this page first.
Privacy in editorial decisions
When there is a choice between a tool that runs locally and a more capable one that requires an upload, we default to local. Where a server call is genuinely unavoidable, the tool is labelled and the reason is documented in the privacy policy. We will not quietly move a local tool to a server.
Accessibility standard
We target WCAG 2.2 Level AA across the site and treat any reported barrier as a defect rather than an enhancement request.