Cookie Policy

Cookies are small text files placed on your device when you visit a website. They are widely used to make websites work, or work more efficiently, and to provide information to the site owner. We also use a similar technology, the browser's localStorage (we do not currently use sessionStorage or IndexedDB). For brevity, we refer to all of these as "cookies" in this Policy.

Under Greek Law 3471/2006 (Art. 4(5)) implementing the ePrivacy Directive, we may set strictly necessary cookies without your consent. All other cookies (preferences, statistics, advertising) require your prior, freely given, specific, informed, and unambiguous consent, which you provide through the cookie banner on your first visit.

The default state is denied: no non-essential cookies are set until you click Accept (all or by category). You can change your choice at any time via the Cookie Settings link in the footer.

Strictly necessary (no consent required)

Name	Provider	Purpose	Duration
sb-*-auth-token	Supabase (auth)	Keeps you signed in to your account	Session + 1h refresh
sb-*-auth-token-code-verifier	Supabase (auth)	OAuth PKCE security parameter during sign-in	~10 minutes
cookie_consent	ganttchartmaker.app	Records your consent choice for the cookie banner	12 months
gcm_sb_bk	ganttchartmaker.app	Crash-safe backup of your sign-in session, restored if the browser loses its site data	60 days
gcm_cc_bk	ganttchartmaker.app	Backup of your cookie-consent choice, same purpose as cookie_consent	12 months
__cf_bm	Cloudflare	Bot management: distinguishes humans from bots	30 minutes
cf_clearance	Cloudflare	Anti-bot challenge token	30 days

Local storage (strictly necessary: used to save your work locally on your device)

Key	Provider	Purpose	Duration
gantt-projects	ganttchartmaker.app	Your locally-saved Gantt charts (signed-out users)	Persistent until you clear it
gantt-theme-mode / gantt-theme-family	ganttchartmaker.app	Your theme preference	Persistent until you clear it
gantt-lang	ganttchartmaker.app	Your language preference	Persistent until you clear it
gantt-side-panel-width	ganttchartmaker.app	Your side panel width preference	Persistent until you clear it
gantt-stat-*	ganttchartmaker.app	Usage counters shown in your profile (exports, time in app), kept only on this device	Persistent until you clear it
gantt-* (other UI prefs)	ganttchartmaker.app	Various UI preferences (today-line, snap, events row, etc.)	Persistent until you clear it

Preferences (consent required)

None currently set without consent.

Statistics / Analytics

With your consent (the Analytics category of the cookie banner), we use Google Analytics 4 to understand how the site and app are used. Nothing loads and nothing is sent to Google until you consent: if you select Reject all, ignore the banner, or your browser sends a Global Privacy Control signal, Google Analytics never runs. Your chart content is never sent to any analytics service. With consent, these cookies are set:

Name	Provider	Purpose	Duration
_ga	Google	Distinguishes visitors for usage statistics	2 years
_ga_*	Google	Keeps session state for usage statistics	2 years

You can withdraw consent at any time via Cookie Settings in the footer; collection stops, and you can clear the cookies from your browser. Separately, our hosting provider (Cloudflare) gives us cookieless, aggregate traffic statistics that set no identifiers and require no consent under the ePrivacy Directive.

Marketing / Advertising (consent required: Google AdSense)

When you have given consent and advertising is active, Google AdSense sets the following cookies:

Name	Provider	Purpose	Duration
NID	Google	User preferences, ad personalisation	6 months
IDE	Google DoubleClick	Measure ad effectiveness	13 months
ANID	Google	Ad personalisation across Google services	13 months
DSID	Google	Cross-device sign-in identifier for ads	14 days
__gads	Google	AdSense ad serving	13 months
__gpi	Google	AdSense personalised ad delivery	13 months
FPID	Google	First-party identifier used by Google services	13 months

If you select Reject all or do not interact with the banner, none of these cookies are set and any advertising shown will be non-personalised. Personalised advertising requires explicit consent.

• Cookie banner: shown on first visit. Choose Accept all, Reject all, or Manage (per-category choices).
• Cookie Settings link in the footer: opens the cookie-preferences panel so you can change your choice at any time.
• Your browser: all modern browsers let you block or delete cookies. Doing so may break sign-in, prevent your chart drafts from being saved locally, and force you to re-set your preferences on every visit.
• Google ad personalisation: turn off personalised ads at adssettings.google.com even after consenting on our site.

We respect the Global Privacy Control (GPC) signal: when your browser sends GPC, we treat it as an opt-out of "sale" or "sharing" for CCPA purposes and as a withdrawal of consent for ePrivacy purposes. We currently do not act on the older Do Not Track (DNT) signal because there is no consensus standard for it.

We may update this Cookie Policy when our cookie usage changes. The Effective date at the top of the page reflects the current version. Material changes are announced via the cookie banner re-prompt and the in-app notifications bell.

Questions about cookies or how we use them: fotis@ganttchartmaker.app.