Tools that run in your browser
Benchvale is a set of small utilities for designers, developers, marketers, and teachers, plus date tools and home project calculators. Each one runs inside the page, which doesn't send what you type to us or anywhere else, and no account is needed. Once a tool has loaded, you can disconnect and keep working. An automated check tests that claim before every update goes live.
- Network requests
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- Our own script
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By what you are working on
Start here
Every tool
Who maintains this
Aaron Wilson. New tools go live when they are ready, and the changelog records what a visitor would notice. How we build tools describes the automated check that stops an update from going live if a tool page starts sending what you type.
Three guides worth starting with: how thick a patio slab should be, whether the end date counts, and Wheel of Names alternatives.
What is coming
More groups of tools are planned, including writing, kitchen, unit conversion, number, file, money and fitness tools. The changelog records each one when it goes live.
Why another tools site
Most free utilities are one of two things. Either they upload what you paste to a server you know nothing about, or they work fine until they ask you to make an account to keep your own data. Both are avoidable for this kind of tool, because the work is arithmetic and text handling that a browser does perfectly well on its own.
So the rule here is that the computation stays on your device, saving anything is optional and local, and every tool says plainly what it does with what you give it. Where a tool genuinely cannot work that way, it will say so rather than quietly dropping the claim. How we build tools explains how that is enforced.
How to check the claim yourself
The strip at the top of this page is measured in your browser as the page runs. It counts the requests the page makes to other sites and checks each one against the published list, then measures the page's own script, not the analytics script, against a 100 KB limit. On October 9, 2026, once the page had finished loading, it counted 2 requests, both on the list, and 6.1 KB of script.
You can run a second test with any tool. Open it, switch off your network, and keep working. It still works, because the work happens in the page. Reloading, or opening a different tool, needs the connection back. To see what each request carries, open your browser's network panel while you type.
Where the numbers come from
Each calculator explains its method on its own page, and where a figure comes from outside, it names the source. The concrete calculator takes its bag yields from the QUIKRETE 1101 data sheet. The flooring waste presets come from the ranges Cavalieri Flooring publishes. Where a figure is only our own starting point, like the 5 percent waste on deck boards or the paint calculator's coverage rates, the page says so. And when we get something wrong, the changelog records the fix, including claims we've withdrawn.