Fine print
Cookies and storage
This site sets two cookies of its own and uses your browser's storage for two conveniences. There are no advertising or third-party analytics cookies.
Last updated 26 September 2026
Cookies
| Name | Set when | Purpose | Lasts |
|---|---|---|---|
| threadline_session | A client signs in | Keeps you signed in to your workspace. Essential. | Until it expires or you sign out |
| tl_v | You follow a tracked link (/t/…) | A random first-party identifier so that repeat clicks from the same browser can be told apart when we measure whether a piece of work was met. It does not identify you. | 12 months |
Browser storage
| Key | Where | Purpose | Lasts |
|---|---|---|---|
| tl-playbook-read | localStorage | Remembers which playbook chapters you have read, on this device only. | Until you clear site data |
| tl-intro | sessionStorage | Plays the site's opening animation once per visit rather than on every page. | Until you close the tab |
Your choices
You can block or delete cookies in your browser settings. Blocking the session cookie means you cannot stay signed in. Blocking the tracked-link cookie has no effect on where the link takes you. Clearing site data resets your playbook progress.
Changes
If we add a cookie or a storage key we will list it here. Current version: 26 September 2026.