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source-lm vs OpenTabs

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 OpenTabs
Detailsource-lm logo source-lmOpenTabs logo OpenTabs
What it doesChrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages Your open tabs, grouped, on every new tab
StageNot given Not given
FoundedNot given Not given
Based inES Not given
Pricing modelPaid Open source
PricingFree plan: 5 bulk actions per month, single sources always free. Pro licence: $29 one time, unlimited bulk runs. Free, under the AGPL-3.0-or-later licence. No paid plans, trials or cards.
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
  • Shows open tabs from every window grouped by site
  • Close all tabs from a site in one click
  • Close duplicate tabs in one press
  • Merge windows into one
  • Customizable briefing with news topics, markets, weather, calendar and to-do list
  • Optional end-to-end encrypted sync between browsers
  • No account required
  • Instantly loads with no network requests on tab open
  • Automatic stale new tab page closing
  • Works completely offline after initial configuration
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
  • Only tab manager that shows actual open tabs on the new tab page itself
  • Completely private by design with no account, no tracking and no server storage
  • Zero network delay when opening new tabs
  • Optional sync is end-to-end encrypted so the server never sees your data
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 checkNot checked yet no change since last check
Trust Flow (Majestic)180
Citation Flow (Majestic)1513
Referring domains (Majestic)243

5 details filled in for both companies.

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