5 tools

Everything here runs client-side

Open one, use it, close the tab. Nothing is uploaded, nothing is stored, and none of them ask who you are.

Calculators

Arithmetic with the assumptions kept visible.

SEO ROI calculatorMost SEO proposals quote a monthly fee and a list of deliverables, and leave the client to guess whether the arithmetic works. This does the arithmetic.A payback month, a 12-month return multiple, and a break-even traffic figure

Templates

Structured files you fill in and take away.

Content calendar generatorPaste your topics, set a cadence, and take away a real spreadsheet with dates already filled in rather than an empty grid you still have to plan.An .xlsx or CSV calendar with dates, owners, formats and a status column Competitor analysis templateA competitor table where every column has a weight, so the ranking at the bottom reflects what you decided mattered rather than how many green cells you managed to fill in.A weighted, ranked scorecard as .xlsx or CSV, with the weights recorded alongside

Generators

Valid files built from what you type.

llms.txt generatorA small Markdown file at your root that tells language models which of your pages are worth reading, in the structure the proposal actually specifies.A valid llms.txt file, ready to save at the root of your domain

Previews

What something will look like somewhere else.

SERP snippet previewGoogle truncates on pixel width, not character count, so a title of sixty characters can fit and a title of fifty-five can be cut. This measures the actual width.A pixel-measured preview, plus the exact character position where truncation lands

How to tell which one you need

The four groups above are not a taxonomy anyone invented for this page — they are the four shapes people actually search for when they want a free tool, and they map onto four different moments in a piece of work.

A calculator is for the argument before the work starts, when somebody has to decide whether the spend is justified and the only honest answer is a set of assumptions with a number attached. A template is for the moment the work is agreed and needs a structure to happen inside — a calendar with real dates, a scorecard with real weights. A generator is for when the artifact has a specification you can get wrong, and getting it right by hand is tedious rather than difficult. A preview is for the last check before something ships, showing you what a system somewhere else will do with what you wrote.

If you are not sure which moment you are in, that is usually a sign the work has not been scoped yet, and the calculator is the one that forces the question.

They keep working when the network stops

None of these tools make a request after the page has loaded, which has a side effect worth knowing about: they work offline. Load a page, disconnect, and it behaves identically. Save it to disk with your browser's save command and it still behaves identically, indefinitely, whatever happens to this domain.

That is not a feature anyone asked for so much as a consequence of the architecture, but it is the honest version of a privacy claim. A promise not to look at your data depends on trust; a page that has no code capable of sending it does not.

What is not here

Anything that has to look at your live site. There is no crawler, no rank tracker and no URL checker on this domain, because a static page cannot fetch another origin and read what came back — the same-origin policy stops it, and that rule is the reason your logged-in webmail is not readable by every page you open.

Those checks exist and they are free; they just need a server, so they live on the main site. There are 19 of them, listed and explained onthe checkers page, or run together asone audit of a single URL.