Fully customize the chat UI. Automatically applies themes based on chat names to control everything from avatar icons and standing images to bubble styles and backgrounds. Adds powerful navigation features like a message jump list with search.
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A userscript that adds powerful theming, UI customization, and advanced navigation features to AI chat UIs.
There are ChatGPT and Gemini versions.
Planned Update for October 2025
An improvement is planned for themes that use avatar icons.
When a conversation contains several hundred messages, performance degradation occurs, especially when opening or closing the Canvas panel.
The root cause has been identified and improvements confirmed in a local build.
Since additional refactoring is also underway, the release will take a little more time.
The update is expected to be published within October.


Full Guide & Details on GitHub:
This script is open-source and licensed under the MIT License.