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source-lm vs Broken Link Checker

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 Broken Link Checker
Detailsource-lm logo source-lmBroken Link Checker logo Broken Link Checker
What it doesChrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages Free Chrome extension that detects broken links, 404 errors, and redirects on any webpage
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 plan: up to 150 links per scan. Lifetime License: $9.50 one-time (50% off, normally $19), includes unlimited links per scan, sitemap health checker, bulk URL checker (20 at a time), image checker, scan history, stats dashboard, and PDF export.
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
  • Color-coded link status results (red for broken, yellow for redirects, green for working)
  • Detects 404 errors, 500 server errors, timeouts and unreachable URLs
  • Identifies 301 and 302 redirects with destination URLs
  • CSV export of scan results
  • Focus Mode to highlight individual links on the page
  • Real-time progress bar during scans
  • Filter results by status
  • Sidebar panel for results review
  • Sitemap health checker (Lifetime License)
  • Image checker to flag broken images (Lifetime License)
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
  • No account or sign-up required
  • Runs entirely in your browser with no data leaving your device
  • Only runs when you click Scan, does not slow down browsing
  • Works on any website including password-protected pages
  • Free to install and use with no credit card required
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 check43 no change since last check
Trust Flow (Majestic)187
Citation Flow (Majestic)1525
Referring domains (Majestic)2436

5 details filled in for both companies.

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