ChronoNav

ChronoNav is an AI productivity tool, delivered as a Chrome extension, that adds timeline navigation to long Gemini conversations for people who run extended, multi-message AI threads and lose track of where things were said. Every message you send becomes a node on a subway-map-style timeline in a minimal sidebar, so instead of scrolling a long chat you click a node to jump straight to that point; previous and next controls let you step through the conversation in order. It can optionally inject your local time and UTC offset into prompts, a feature that is off by default, and the sidebar matches Gemini's light and dark themes. ChronoNav runs entirely browser-side with no external servers, tracking, or analytics, and the listing shows a small 47 KB download supporting English and Simplified Chinese. For anyone comparing the best AI for navigating long Gemini chats, ChronoNav's appeal is that it is lightweight and privacy-respecting rather than a heavy add-on. The honest caveats: it is Gemini-specific so it does not help in other chat tools, and it is early, with only a handful of users and reviews on the store at the time of listing.

Jumping between and navigating messages in long Gemini AI conversations via a sidebar timeline.