BrainTool
Topic-based tab and bookmark manager with notes and org-mode sync
Founded
2020
Starting Price
Free
Category
Productivity
Last updated February 20, 2026
About BrainTool
BrainTool is a browser extension that organizes your tabs, bookmarks, and notes into a hierarchical topic tree. Instead of flat bookmark folders, you build a structured knowledge map where every saved page has context — notes, to-do status, and a place in your personal topic hierarchy. Data syncs to a plain-text org-mode file on Google Drive or locally, keeping you in control of your information.
Pros & Cons
Pros
- Topic-based hierarchy gives far more organizational depth than flat bookmark folders
- Inline notes and annotations add context that plain bookmarks completely lack
- Org-mode plain-text storage means your data is portable and editable with any text editor
- Open source with no data stored on external servers — full privacy control
- To-Do/Done tracking turns your bookmark manager into a lightweight task system
Key Features
Topic Tree Organization
Organize bookmarks and tabs into a hierarchical topic tree with drag-and-drop
Tab and Window Control
Open, close, and navigate tabs, windows, and tab groups directly from the topic manager
Notes and Annotations
Add notes and context to any saved page within the topic hierarchy
To-Do/Done Tracking
Mark bookmarks and tabs as tasks with TODO and DONE status
Org-Mode File Sync
Data stored in plain-text org-mode format, synced to Google Drive or local file
Session Saving
Save and restore complete browser sessions with all tabs and windows
Full-Text Search
Search across all links, descriptions, and notes
Bookmark Import/Export
Pricing
Free
Free
- Unlimited saved items
- Bookmark import/export
- Google Drive or local sync
- Full-text search
- To-Do/Done annotations
Best For
Research Organization
Build a structured topic tree for research projects with notes alongside each source
Knowledge Management
Create a personal knowledge base from web resources organized by topic hierarchy
Task-Driven Browsing
Track reading lists and web-based tasks with TODO/DONE annotations
Session Management
Save and restore complete browsing sessions for different projects or contexts
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