Privacy Policy
Short version: your graphs never leave your device. We use analytics to understand which pages are useful, and advertising to pay for the site. You can decline both.
Who we are
This policy covers Grafolyn at https://grafolyn.com. For any privacy question, contact hello@grafolyn.com.
What we do not collect
This is the part that matters most, so it goes first.
- Your graphs and expressions. Everything you type is parsed, compiled and drawn on your own device. None of it is transmitted to us. There is no server performing the mathematics, so there is nothing for us to receive, log or store.
- Your data tables. Values you enter or paste into the Data tab stay in your browser's memory.
- Accounts. There is no sign-up, so we hold no names, email addresses or passwords from using the calculator.
- Share links. When you press Share, the graph is encoded
into the part of the URL after the
#. Browsers do not transmit that portion to the server, by design. We cannot see the contents of a link you create or open.
What is stored on your device
The site uses your browser's local storage for a small number of preferences. This data stays on your device, is not transmitted to us, and can be cleared at any time through your browser settings.
| Key | Purpose |
|---|---|
grafolyn-theme | Remembers whether you chose light or dark mode |
grafolyn-consent | Remembers your privacy choice, so we stop asking |
grafolyn-consent-at | When that choice was made, so we can ask again after 180 days |
Analytics
Subject to your consent, we use analytics services to understand which pages are read and where people have difficulty. This tells us which guides to improve and which features are ignored.
- Google Analytics 4 reports aggregate traffic: page views, approximate location by country, device type, and how visitors arrived. IP addresses are anonymised.
- Microsoft Clarity records aggregated interaction patterns such as where people click and how far they scroll, which is how we find confusing interface elements. Clarity automatically masks text content by default.
Both are configured through Google Consent Mode, which means that until you accept, they operate without cookies or advertising identifiers. If you decline, they stay in that restricted state.
These services are operated by Google LLC and Microsoft Corporation respectively, and their own privacy policies apply to data they process.
Advertising
The site is funded by advertising served through Google AdSense. Ads appear in the written guides only, never inside the calculator interface.
Third-party vendors, including Google, use cookies to serve ads based on prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads based on your visits to our site and elsewhere.
You can control this directly:
- Opt out of personalised advertising at Google Ads Settings.
- Opt out of other third-party vendors at aboutads.info.
- Decline consent on this site, using the banner or the section below.
If you decline, you will still see advertising, but it will be non-personalised: selected by the content of the page rather than by any profile.
Your choices
The consent banner appears on your first visit and records your answer for 180 days. To change your mind at any time, clear this site's data in your browser settings and the banner will appear again on your next visit.
Browser-level controls also work: disabling third-party cookies, using private browsing, or running a content blocker will all limit what these services can do. The calculator works normally in every case.
Legal bases and your rights
Where the UK GDPR or EU GDPR applies, our legal basis for analytics and advertising cookies is your consent, which you may withdraw at any time. Where the site operates without them, our basis is legitimate interest in running a functioning website.
Depending on where you live, you may have rights to access, correct, delete, or restrict the processing of personal data about you, and to object to processing or request portability. California residents have additional rights under the CCPA and CPRA, including the right to opt out of the "sale" or "sharing" of personal information; declining consent here exercises that choice for this site. We do not sell personal information for money.
To exercise any of these, email hello@grafolyn.com. Note that because we hold no account data, we usually have nothing associated with you to provide or erase. Requests concerning data held by Google or Microsoft should be directed to those companies, which act as independent controllers for it.
Children
This site is intended for general audiences and is not directed at children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, contact us and we will delete it.
Data transfers and retention
We hold no personal data ourselves, so there is nothing for us to retain or transfer. Data processed by Google and Microsoft may be transferred to and stored on servers outside your country, under the safeguards described in their own policies.
Security
The site is served over HTTPS. Because your work never leaves your device and we operate no database, the usual risks associated with stored user data do not arise here.
Changes to this policy
If this policy changes materially, the date below will be updated and the consent banner will be shown again. The current version was last reviewed on 18 September 2026.