The full list,
no buried defaults.

Tells us which user you are so your companions are yours. Without it, the site doesn't work.

Duration

365 days

Opt out

Use the site without an account, or click "forget everything" on /goodbye to clear it.

A random id, only sent to the Halloween page's costume-selfie maker, so each visitor gets their fair share of free selfies. Holds no personal data.

Duration

30 days

Opt out

Don't use the costume-selfie maker, or clear it from your browser settings.

A random id that lets the Halloween page's wolf-or-vampire vote count you once and remember which side you picked. Holds no personal data.

Duration

60 days

Opt out

Don't vote, or clear it from your browser settings.

A random id in localStorage that lets us count how many people land on a page and how many go on to build a companion. It isn't a login, it holds no personal data, and it never leaves us — nothing is shared with an ad network.

Duration

Until you clear browser storage

Opt out

Clear it from your browser settings whenever.

Anonymous session replay so we can see where the site confuses people. Email and free-text fields are scrubbed before recording.

Duration

1 year (_clck) / session (_clsk)

Opt out

Use a browser-level tracker blocker (most ad-blockers and privacy-focused browsers stop Clarity automatically), or block clarity.ms in your browser's content settings.

Counts visits and which pages people read, so we can see what's working. Set when the Google tag loads; it holds a random id, not your name or email.

Duration

2 years

Opt out

Use a tracker-blocking browser extension, or block googletagmanager.com and google-analytics.com in your browser's content settings. Google also offers an opt-out add-on at tools.google.com/dlpage/gaoptout.

Lets us measure which Meta ads led to which signups so we know which campaigns are working. _fbp is set on every visit; _fbc is only set when you arrive from a Meta ad with a click id.

Duration

90 days

Opt out

Use a tracker-blocking browser extension, or block connect.facebook.net in your browser's content settings. Meta also offers an account-level opt-out at facebook.com/ads/preferences.

Lets us measure which Google Ads led to which signups. Set on every visit when the tag loads; used for conversion attribution and remarketing audiences.

Duration

90 days

Opt out

Use a tracker-blocking browser extension, or block googletagmanager.com in your browser's content settings. Google also offers an account-level opt-out at adssettings.google.com.