Privacy

Last updated 28 July 2026

The short version: what you build in these tools never reaches us, because the tools run entirely inside your browser. This isn't a promise about how we handle your data — it's a description of an architecture in which we never receive it.

What never leaves your browser

Everything you type into a tool on this site — calculator labels, formulas, rates, prices, colours, saved projects and exported files — is processed locally by JavaScript running on your own device. None of it is transmitted, stored or logged by us. You can verify this: open your browser's network tab, build a calculator, and watch that no request carries your work anywhere.

The same is true of the files you export. An exported calculator makes zero network requests at runtime. It cannot report back to us, so the numbers your own website visitors enter are never visible to us either.

What is stored on your device

• Your licence key, if you buy Pro, is kept in your browser's localStorage so the tool knows to unlock Pro features. Clearing your browser storage removes it; re-enter the key to restore it.

We do not use cookies for tracking, advertising or analytics profiling.

What we do receive

• Standard server logs. Our host (Cloudflare Pages) records ordinary request data such as IP address, timestamp, requested path and user agent, as any web server does. This is used for security and reliability.
• Licence activation. When you complete a purchase, or activate a key on a second device, your browser makes one request to our /api/verify endpoint. It carries only the Stripe checkout session id or the licence key itself.
• Payment details — via Stripe, never us. Purchases are processed by Stripe. Your card number never touches our servers. We receive the email address attached to the purchase, so we can support and, if needed, refund you. Stripe's own privacy policy governs their handling of your payment data.

Lead capture (Pro)

If you enable lead capture on an exported calculator, submissions go to the destination you configure — your email address, or a form endpoint you already run. They do not pass through us at any point, and we have no ability to read them. You are the data controller for anything you collect that way, and it is your responsibility to describe it in your own privacy notice.

Third parties

We use Cloudflare to host the site and Stripe to take payments. We do not run advertising networks, session recorders, heatmaps, or third-party analytics on this site.

Your rights

Because we hold so little, most data requests resolve quickly. If you have purchased, you can ask us to delete the email address associated with your purchase — note that we may need to keep transaction records for tax and accounting purposes. Reply to your Stripe receipt to reach us.

Children

These tools are aimed at businesses and are not directed at children under 13.

Changes

If this policy changes materially, the date at the top changes with it. The core commitment — that your work stays in your browser — is architectural, and is not something we intend to alter.