Last Updated: March 08, 2026
KotCat – Save Words While Browsing (“we”, “our”, or “the extension”) is a Chrome browser extension that helps users save selected words from web pages to their vocabulary cards on kotcat.com.
This Privacy Policy explains what information is used when you use the extension and how it is handled.
This extension only reads text that the user explicitly selects. The extension does not collect, store, or sell personal data.
All information required for the extension’s functionality is stored locally in the user’s browser or sent directly to the KotCat API when the user explicitly chooses to save a word.
The extension stores the following information locally on your device using Chrome’s storage API:
• API Token — used to authenticate requests to kotcat.com
• Folder ID — identifies the folder where saved words will be stored
• Extension settings — user preferences such as enabling or disabling the extension
This information is stored locally in your browser using chrome.storage.sync.
We do not have access to this data.
When a user explicitly chooses to save a word, the extension sends the following information to KotCat:
• the selected word
• the URL of the page where the word was selected
• the user’s API token (for authentication)
• the target folder ID
This information is sent via HTTPS directly to the KotCat API endpoint:
https://kotcat.com/api/ext/cards
The extension only reads text that the user selects manually.
The extension does not collect:
• personal identification information (name, email, etc.)
• browsing history
• full page content
• background tracking data
• analytics or advertising identifiers
Only the minimum information required to save a selected word is used.
The extension uses the information described above only to:
• authenticate API requests to kotcat.com
• save selected words to the user’s vocabulary collection
• store extension preferences locally
• show confirmation notifications when a word is saved
No data is used for advertising, profiling, or tracking.
• Local data is stored using Chrome’s secure storage system (chrome.storage.sync)
• API communication with kotcat.com uses HTTPS encryption
• The extension does not maintain its own servers or databases for user data
All saved vocabulary data is stored on kotcat.com according to the KotCat website privacy policy.
The extension integrates with kotcat.com, an external service.
When the extension sends a saved word, the data is processed by KotCat servers in order to create a vocabulary card in the user’s account.
Handling of this data is governed by the KotCat website privacy policy.
The extension uses content scripts that run on pages you visit. These scripts:
• detect text selected by the user
• send the selected text to the extension background process
• do not collect page data
• do not track browsing activity
• do not modify page content
Content scripts only activate when text is selected by the user.
The extension requires the following permissions:
[ contextMenus ]
Used to add the “Add to dictionary” option to the browser right-click menu.
[ storage ]
Used to store your API token, folder ID, and extension settings locally.
[ notifications ]
Used to display confirmation messages when a word is successfully saved.
[ host permissions ]
Used to send secure requests to the KotCat API at: https://kotcat.com
You have full control over the extension and its stored data.
You may:
• view stored data in Chrome’s extension settings
• clear stored data through Chrome’s extension management
• disable the extension at any time
• uninstall the extension to remove all locally stored data
Local data remains on your device until:
• the extension is uninstalled
• Chrome extension storage is cleared
Words saved through the extension are stored on kotcat.com according to KotCat’s data policies.
This extension is not intended for children under the age of 13.
The extension does not knowingly collect personal information from children.
This Privacy Policy may be updated periodically.
When changes are made, the Last Updated date at the top of this document will be updated.
Continued use of the extension after changes indicates acceptance of the updated policy.
If you have questions about this Privacy Policy or the extension, please contact us:
Website https://kotcat.com