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source-lm vs Index

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

source-lm compared with Index
Detailsource-lm logo source-lmIndex logo Index
What it doesChrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages Keep work, personal life, and every project in its own space. Switch between them without closing tabs or losing your place.
StageNot given Not given
FoundedNot given Not given
Based inES Not given
Pricing modelPaid Free
PricingFree plan: 5 bulk actions per month, single sources always free. Pro licence: $29 one time, unlimited bulk runs. Not given
Key features
  • Split JSON exports into Markdown files with 400,000-word budget
  • Filter sources, detect duplicates, and batch delete
  • Incremental uploads skip already-added content
  • No account or login required
  • Source-available code published unminified
  • No data written to disk or stored on servers
  • Supports Telegram Desktop and Telegram for macOS exports
  • Spaces, each holding its own groups that open as Chrome tab groups
  • Favorites: up to eight pinned pages that stay with you in every space
  • Sleeping tabs that go out of sight and come back when clicked
  • Hundreds of themes
  • Rewind function keeping a week of changes on your computer
  • Export one JSON file to share with AI assistants like ChatGPT or Claude
  • Search any group, space or link from any page
  • Private by design with no account, server, or network requests
What makes it different
  • No backend or recurring costs: pay once, keep the licence forever
  • Runs entirely in your browser with no account or login needed
  • Smart splitting keeps records whole and avoids duplicates on re-runs
  • Source-available and unminified so you can audit the code yourself
  • Extends NotebookLM's interface with bulk operations and source management tools
  • Keeps a week of changes you can rewind through on your computer
  • Sleeping tabs preserve your place while keeping them out of sight
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)15 −1 (down) since last check20 no change since last check
Trust Flow (Majestic)180
Citation Flow (Majestic)159
Referring domains (Majestic)247

4 details filled in for both companies.

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