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source-lm vs Fontsight

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 Fontsight
Detailsource-lm logo source-lmFontsight logo Fontsight
What it doesChrome extension to bulk-add sources to NotebookLM from JSON exports, YouTube, and web pages Point at any text to see the typeface that actually rendered, who made it, and the CSS to use it.
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
  • Identify fonts by pointing at text on any website
  • Shows the actual font that rendered, not just CSS fallbacks
  • Swap fonts and test alternatives on any website in real time
  • Built-in directory of 7,900+ font families from 197 type houses
  • Find free alternatives to paid fonts
  • Test fonts with waterfall, paragraph and glyph views
  • No account required, no data collection
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
  • Identifies the actual font that rendered on the page, not just CSS preferences
  • Built-in font directory with 7,900+ families from 197 type houses and 98 brands' in-house fonts
  • Finds free Google Font alternatives to expensive paid typefaces
  • Test any font on any website with live preview and CSS output
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)150
Referring domains (Majestic)240

4 details filled in for both companies.

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