Lostless

Get lost less in long Claude.ai conversations.

Claude conversations get long. Important paragraphs scroll out of view. You lose your place. Lostless turns Claude.ai into a navigable workspace — bookmark important paragraphs, branch sub-threads from any line, and jump back instantly.

What it does

Color bookmarks

Flag any paragraph with a color and tag. Click the bookmark tab to jump back, even after Claude has virtualized the page.

Inline notes

Double-click a paragraph to open a note widget. Anchored to that exact line, even after the conversation grows.

Sub-thread navigation

Branch a sub-thread off any line. The sidebar lists every thread across every Claude conversation.

What it isn't

It's not a Claude.ai replacement. It augments Claude in place.
It doesn't see your conversation content unless you bookmark it (then only the snippet you bookmarked).
It doesn't run analytics or telemetry on your usage.
It doesn't store anything on our servers. Everything stays local to your browser.

Install (Web Store coming soon) Privacy