What you type here never leaves your device. Every one of these tools is compiled to WebAssembly and runs inside this browser tab. There is no server to send anything to, and none of them makes a network request while it works. You can open your browser's network panel and use any of them: nothing goes out.
The baby log, the allowance tracker and the chore rota are the three tools whose input is about somebody. All three take what you type, work it out and forget it when the tab closes. There is no account, no history, no profile and no server — which is worth saying plainly, because the opposite is the norm in every one of those categories.
It also means a shared link carries what is in it. A link to a baby's day contains the feeds and the times; a link to an allowance contains the children's names. That is visible in the result before you share it.
A saponification value, a yarn's metres a hundred grams, a wax's density, a filament's grams a metre, a circle of confusion, a gestation length and a theobromine content are all published numbers for a kind of thing, taken from the trade's own tables. None of them is a measurement of the thing in front of you, and each result says so and names what wins: the bottle, the ball band, the spool, the packet.
The lye calculator carries the safety notes for handling a caustic and says any recipe must be checked before it is made. The chocolate tool gives a risk band and says, on every result including the lowest one, to ring a vet. The pet food portions say a vet decides what an animal should eat. The baby log says a health visitor or a doctor decides whether a baby is feeding well. None of those is a judgement this page is entitled to make.
A table small enough to ship answers confidently about the few things it knows and says nothing about the rest, and you never see which just happened. So the figures come from the packet, the bottle or the ball band in front of you, and the tools say so. The tables that are here are published ones for a kind of material, and each result names which it used.
Each tool remembers your settings, and remembers your input while it is small
enough to be worth keeping, under about eight kilobytes. It is kept in your
browser's own localStorage, on your machine, and is never
transmitted. Clearing your browsing data removes it, and a private window keeps
nothing at all. Your chosen language and theme are stored the same way.
No account, no sign-up, no cookies of our own, no analytics script, no fingerprinting, no error reporting. The pages carry no third-party JavaScript except the advertising described below.
These pages carry advertising, which is what pays for hosting them. An advertising network sets its own cookies and sees your IP address and the page you are on, in the same way it does on any other site. It does not see what you type into a tool: that text is never part of the page's markup and is never sent anywhere. If you would rather it saw nothing at all, an ad blocker breaks none of the tools.
A life counter, a quiz buzzer and an escape-room timer are not here. All three keep a state and run a clock — a counter you press, four keyboards racing to a millisecond, a countdown on a projector — and a tool here is a function from one text to one result. Five more became the half of themselves that is a function: a scramble rather than a timer, an average of the times you type rather than the times it takes. Each of those says which half it is on its own result.
The same tools are also built as a desktop application. It has no network code at all — not for updates, not for anything — and stores its settings in one small file in your user configuration directory.
If this ever changes, this page changes with it, and the change will be visible in the project's history rather than announced quietly.