BrainTool
Topic-based tab and bookmark manager with notes and org-mode sync
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
- Keyboard shortcuts make saving and navigating extremely fast once learned
Cons
- Steep learning curve compared to simpler tab managers like OneTab
- Can become slow or buggy when handling hundreds of tabs or very large topic files
- Bookmark sync behavior can be confusing — may rename or reorganize existing bookmarks unexpectedly
- Interface looks functional but dated compared to more polished alternatives
- Chrome and Edge only — no Firefox support
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
Import existing bookmarks and sync with browser bookmarks bar
Tab Group Display
Visual display of Chrome tab groups within the topic tree
Keyboard Shortcuts
Powerful keyboard commands for fast navigation and organization
Pricing
- Unlimited saved items
- Bookmark import/export
- Google Drive or local sync
- Full-text search
- To-Do/Done annotations
- Tab group display
- Session saving
- Everything in Free
- Dark, Dense, Large and Favicon modes
- Automated backups
- Nag-free experience
- Everything in Supporter monthly
- Save vs monthly pricing
- Everything in Supporter
- One-time payment
- Lifetime access
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
Emacs/Org-Mode Users
Sync browser bookmarks with org-mode files for users already in the Emacs ecosystem
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