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Cookies and local storage
18 August 2026
Written by checking what the code sets, not by listing what a cookie policy usually lists. As built, the app does not itself set a traditional server-issued HTTP cookie at all — what it uses instead is your browser's own local storage, for a short, specific list of things, and that is what is described below. If that changes, this page needs updating to match.
What is actually stored on your device today
| What | Purpose | Expires |
|---|---|---|
| A free-generation counter | Limits how many free readings this device can generate before it has to wait | 24 hours |
| Your recent charts | Lets you return to a chart you generated on this device without re-entering it. Never sent to us, never visible to anyone else | Until you clear it, or clear site data |
| Your light/dark preference | Remembers which theme you chose | Until you clear site data |
Clearing your browser's site data for this domain removes all of the above and resets your free-generation counter.
If bot-checking is enabled
Cloudflare Turnstile, when the operator has configured it, sets its own cookie to run its check. It is designed not to profile you. This page defers to Cloudflare's own documentation for the detail, since it is Cloudflare's cookie, not ours.
If you proceed to payment
Payment is currently switched off — see the terms of service — so this does not apply yet. Once it does, paying takes you to Stripe's own hosted checkout page, on Stripe's own domain, where Stripe sets its own cookies under its own cookie policy. We do not set them, and this page cannot speak for Stripe's.
Analytics and advertising
No analytics script loads today. The site's own event tracking only sends anything to an analytics tool if one is already present on the page, and none is loaded by default. Google AdSense code exists in the product but is switched off by default; if the operator turns it on, no advertising script will load until you accept non-essential cookies, and declining costs you nothing — the site works the same either way.
Your choice
Because nothing beyond the essentials above is currently active, there is no consent banner controlling anything real yet. If analytics or advertising is switched on, consent will be asked for before either loads, refusing will be exactly as easy as accepting, and this page will be updated to list precisely what each one stores.