Privacy

What is collected, and what is not.

In plain words, because a privacy page nobody can read is not a privacy page. There are two places you can give us anything: the front page, and the app. Each is described separately.

The front page

If you use the sign-up form there, four things are recorded: the email address you typed, the date and time, which page the form was on, and the referring page if your browser sent one. Nothing else. They go into a private Google Sheet in the owner's own Google Drive, so that we can email you about the product. The front page sets no cookies and runs no analytics.

The app

Signing in. You sign in with a link sent to your email. To keep you signed in, the app sets one cookie in your browser. It holds a random session id and nothing else, and it lasts 30 days or until you sign out. There is no password to store.

What the app records about what you do. When you open a page or press a button, the app records the event with your email address, the page, and the time. The owner reads this to see which charts people use and where they get stuck. It is kept for 90 days.

Session recording. The app uses PostHog, an analytics service, and it records how you move around the page: clicks, scrolls and mouse movement on the charts. Anything you type is masked. These recordings are tied to your email address, are seen only by the owner, and exist so that a one-person product can see where the tool is confusing. PostHog stores this data on its servers in the United States under its own terms. If you would rather not be recorded, email the address below and your account is switched off from recording.

The chat box. The chat box in the corner is provided by tawk.to. When you open it, what you type goes through tawk.to's servers to the owner's phone, and tawk.to sets its own cookie to keep the conversation together. If you never open it, it holds nothing about you beyond a page-load.

Paying. Payment is taken by Stripe. Your card details go to Stripe and never to us. We see your email address, what plan you are on, and whether it is active. Stripe's own privacy policy applies to the payment itself.

The sign-in email. It is sent through Resend, an email delivery service, which sees your address and the time it was sent.

Your marks and drawings on charts are stored in your own browser, not on our servers. We cannot see them.

Who else sees any of it

Nobody, beyond the services named above doing the job named above. Your address is not sold, not rented, not swapped and not shared with anyone else, and it is not used to build an audience for advertising.

One thing your browser does that is worth naming

These pages load their typeface from Google Fonts, so your browser makes a request to Google's servers when a page loads and Google receives your IP address as part of it, the same as for any site using their fonts.

How long it is kept

Your account, for as long as you have one. Event records, 90 days. Session recordings, as long as PostHog's free tier keeps them, currently 30 days. If you delete your account, everything tied to your email is deleted from our side within 30 days.

How to be removed, or to see what is held

Email kumares2013@gmail.com and ask. No form, no reason needed. You will be told what is held, and it will be deleted, and you will not hear from this address again.

Children

This is not intended for anyone under 18, and addresses from children are not knowingly collected.

Changes

If what is collected changes, this page changes on the same day. It was last updated on 8 September 2026.

Questions about any of this: kumares2013@gmail.com. Terms