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source-lm vs SumSpot

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 SumSpot
Detailsource-lm logo source-lm SumSpot
What it doesChrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages Summarize any article automatically in Safari
StageNot given Not given
FoundedNot given Not given
Based inES US
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
  • Automatic summarization as pages load
  • Summaries appear directly in Safari
  • Works across the web on any site
  • Works on iPhone, iPad and Mac
  • Granular permission controls
  • No account or sign-up required
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
  • Summary ready instantly without any action needed
  • Works everywhere you read on the web
  • No separate app or digest email to manage
  • Stays out of your way until you need it
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 check5 no change since last check
Trust Flow (Majestic)187
Citation Flow (Majestic)1518
Referring domains (Majestic)2418

5 details filled in for both companies.

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