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source-lm vs Side Copilot

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 Side Copilot
Detailsource-lm logo source-lmSide Copilot logo Side Copilot
What it doesChrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages Browse less. Get more done.
StageNot given Not given
FoundedNot given Not given
Based inES Not given
Pricing modelPaid Freemium
PricingFree plan: 5 bulk actions per month, single sources always free. Pro licence: $29 one time, unlimited bulk runs. Free: $0/month with up to 5 spaces and basic chat. Pro: $2.9/month ($4.9 monthly equivalent) with unlimited spaces and Agent Mode. Pro+: $7.9/month ($11.9 monthly equivalent) with cross-page agent and additional tools. Yearly plans include 2 months free.
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
  • Vertical tabs manager in side panel
  • Group tabs by domain or AI
  • Chat mode to query open tabs
  • Agent mode for browser automation
  • Suspend tabs to free memory
  • Pin and search tabs
  • Support for multiple languages
  • Save and restore tab groups
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
  • AI-powered tab organization without switching browsers
  • Side panel operates without breaking workflow
  • Works across multiple browsers and platforms
  • Generous free plan with cloud sync
  • Natural language AI grouping
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 check52 no change since last check
Trust Flow (Majestic)1820
Citation Flow (Majestic)1532
Referring domains (Majestic)24287

5 details filled in for both companies.

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