Effective date: 17 September 2026 · Applies to the 4D-Signal browser extension (v1.1)
The short version: 4D-Signal computes everything on your device. We do not receive, store, or see your behavioral signals. The only data that ever leaves your machine is something you explicitly switch on yourself — a team aggregate of counts and averages, with no personal signal streams.
1. What the extension processes
The extension measures interaction timing metadata on pages you visit: click cadence, scroll speed, dwell time, hesitation pauses, tab focus changes. This is processed locally, in real time, to produce your Friction Index (CFI).
2. What the extension never touches
Keystrokes, typed content, or form values — including passwords
Page content, emails, messages, or documents
Browsing history, bookmarks, or saved data from other extensions
Personal identifiers (name, email, identity) — the free tier runs with no account at all
3. What leaves your device
Nothing, by default. The free and Pro individual tiers are fully on-device. Activation of a Pro license sends only the license key to the license server for validation.
Team aggregates (explicit opt-in only). If you voluntarily join a team pilot and tick the opt-in box, the extension sends once per day: your team's ID, the date, device count, mean CFI, session count, and aggregated event counts. No timestamps, no per-event data, no per-person streams, no content. The minimum sample threshold (12 devices) exists so no individual can be singled out.
4. Storage
Your daily CFI history is stored in chrome.storage.local on your own device. It never syncs to our servers. You can clear it at any time from the extension popup.
5. Third parties
We do not sell, rent, or transfer user data to third parties for any purpose. License purchases are processed by Gumroad under their own privacy policy; we receive only the license key and purchase status needed to validate your Pro license.
6. Changes
If this policy changes, the change will be listed here with a new effective date before any new data practice begins. Data practices never expand silently.
7. Contact
Questions or deletion requests: use the contact link on the extension's store listing or the 4D-Signal documentation site.