Privacy Policy

Last updated: 2026-05-08

Lostless is a Chrome extension that adds bookmarks, inline notes, and sub-thread navigation to Claude.ai. This page explains exactly what data Lostless touches, what it does with it, and what it never does.

What Lostless stores locally

The extension stores the following on your device only, in chrome.storage.local, scoped to your browser profile:

• Bookmark records — the text snippet you bookmarked, the conversation it belongs to, and a color/label.
• Inline notes — text you wrote, anchored to a specific paragraph.
• Sub-thread records — the branched thread content you authored.
• Sync configuration — if you enable cloud sync, the access token you provided (stored locally; sent only to your chosen cloud provider's API).
• Per-device ID — a random UUID that identifies your device to your sync gist for last-write-wins merging. Not tied to your identity.

This data never leaves your device unless you turn on sync.

What Lostless sends to the network

Without sync enabled: nothing. The extension makes no outbound network calls.

With GitHub Gist sync enabled (opt-in): the extension calls api.github.com using the access token you provided, to read and write a single private gist file (threadnote-sync.json) containing your bookmarks and notes. Your token never leaves your browser except in the Authorization header to GitHub.

If you opt in to release-notes email on the welcome page: your email address is sent to a Lostless intake endpoint and stored for the sole purpose of notifying you when paid features launch. We do not sell, share, or use it for any other purpose.

What Lostless reads from the page

To anchor bookmarks and notes to specific paragraphs, the extension reads the DOM of claude.ai pages while you have them open. It only stores text from a paragraph if you explicitly bookmark or note it. It does not transmit page content anywhere.

What Lostless does not do

• No analytics, no telemetry, no usage tracking.
• No third-party services in the request path. (Your sync provider is your own choice; we do not custody any data.)
• No fingerprinting, no profiling, no ad targeting.
• No background data collection — the extension is dormant unless you have a Claude tab open and you interact with it.
• No reading or storage of your Claude account credentials. Lostless only sees the rendered DOM, never the auth layer.

Data retention and deletion

All local data persists until you uninstall the extension or clear browser data. Uninstalling Lostless removes the extension's local storage entirely.

If you used cloud sync, your gist remains in your GitHub account after uninstall. To delete it, visit gist.github.com and delete the threadnote-sync.json gist.

If you opted in to email: reply to any release-notes email with "remove" or email [email protected] and we'll delete your address.

Permissions

The extension requests these Chrome permissions:

• storage — to keep your bookmarks/notes locally.
• activeTab — to inject the bookmarking UI into the active Claude.ai tab.
• alarms — to schedule periodic sync if cloud sync is enabled.
• host_permissions: claude.ai/* — to run on Claude.ai pages.
• host_permissions: api.github.com/* — to talk to GitHub for optional sync.

Changes to this policy

If we ever change this policy, we'll update the date at the top and announce it via the welcome page on the next extension update. We will never reduce your privacy without an explicit opt-in.

Contact

Questions, deletion requests, or concerns: [email protected].