Last updated: 28 October 2026
Claude Themes runs entirely in your browser and collects nothing. It applies the colour theme you choose to claude.ai and keeps your settings on your device. No account, no analytics, nothing is sent to any server.
Claude Themes is a free Chrome extension that changes the look of claude.ai, such as its colours and fonts. You can also set a day theme and a night theme that switch automatically at times you choose. It does this with CSS only and changes nothing else on the page.
None. The extension does not collect, store remotely or transmit any personal data. It does not read your conversations, has no account and no sign-up, and includes no analytics. Nothing is sent to NUVIX or to any third party.
The extension applies CSS on claude.ai. It does not read your conversations, interact with Claude's features or access any other page data.
Your theme settings (colours, chosen theme and any day and night schedule) are kept in Chrome's local extension storage (chrome.storage.local) on your device. Nothing is stored on a remote server. Removing the extension removes these settings.
Nothing else is needed. The definitive permission list is shown by Chrome on the extension's install screen.
None. The extension does not share data with any third party, because it does not collect or transmit any data in the first place.
If this policy changes, the updated version will be posted on this page with a new date at the top. Material changes will be reflected here before they take effect.
Questions about this policy or the extension? Email info@nuvix.studio.