Cat Highlighter icon

Cat Highlighter

by Summercat · Tools
Manifest V3 Free
View in Chrome Web Store Data as of 18 Oct 2026

Web highlights, annotations, page notes, and export tools for AI chats and web reading.

Users
158
+31 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
14
0 in 30 days
Store rank
#71K
#59K among extensions
Version
v1.7
updated 16 Sep 2026

Users

monthly, 6 months
079158Apr 2026Aug 2026Oct 2026
Latest, 18 Oct 2026: 158 usersMove the mouse over the chart for any month

Ratings count

monthly, 6 months
0714Apr 2026Aug 2026Oct 2026
Latest, 18 Oct 2026: 14 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Cat Highlighter

Do important ideas in AI chats get buried as new replies come in? Do questions, insights, or follow-up prompts occur to you while reading, only to disappear a moment later? Cat Highlighter is designed for this exact workflow: read, think, and organize. Highlight, underline, annotate, and write page notes directly on web pages and AI chat pages. Each page or conversation is saved separately, so your highlights can be restored after refreshing or reopening. With Cat Highlighter, you can: - Highlight important sentences on web pages and in AI responses. - Use different highlight colors to organize different types of information. - Add annotations to individual highlights. - Write page notes to capture questions, summaries, prompts, and action items. - Review, search, filter, and organize saved records on the management page. - Export your highlights, annotations, and notes to Markdown, HTML, Mowen, Notion, Obsidian, or SiYuan. Cat Highlighter is especially useful for people who: - Frequently use ChatGPT, Gemini, Kimi, DeepSeek, Perplexity, Comet, and other AI tools. - Read long articles, reports, research materials, or documentation. - Want to turn AI conversations into structured notes. - Need to capture thoughts and key points while reading. Cat Highlighter is not another complicated knowledge base. It is a lightweight tool that helps you capture ideas while you read and chat with AI. By default, all highlights, annotations, page notes, and settings are stored locally in your browser. Content is only sent to third-party services when you explicitly choose to export it.

Growth

WindowUsersChangeRatingsRating
7 days+22+16.2%00.00
30 days+31+24.4%00.00

Version history

8 versions recorded
v1.716 Sep 2026
v1.615 Sep 2026
v1.54 Aug 2026
v1.422 May 2026
v1.311 May 2026
v1.210 May 2026
v1.14 May 2026
v1.029 Apr 2026

Details

Category
Tools
First seen
29 Apr 2026
Size
169 KB
Languages
en, zh-CN
Pricing
Free
Privacy policy
github.com
Support
github.com
Extension ID
ihhfjhcehkggejpggnddmgpfdbkbobpd

Permissions and risk

Moderate riskimpact 3, likelihood 2
Permissions
activeTabscriptingclipboardWritestoragesidePanel
Site access
<all_urls>
Can read and change data on every website you visit.

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