Keyword Cluster vs Second Read

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Keyword Cluster compared with Second Read
Detail	Keyword Cluster	Second Read
What it does	Chrome extension for keyword clusters and SEO insights	Everything you save, read again.
Stage	Not given	Startup
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	Not given	Free with no paid tier planned.
Key features	Keyword clustering by search intent Long-tail keyword discovery AI-powered keyword grouping Real-time insights on Google and Bing Topic cluster identification Related search query suggestions No account or login required Support for Google, Bing, and YouTube	Drag-and-drop text capture from any screen element Automatic passage selection on new tabs based on spaced repetition Kindle highlight synchronization Telegram bot integration Email and Telegram digests Web library with search and tagging Export to Markdown or JSON Works offline with local storage Optical character recognition for non-selectable text No password authentication
What makes it different	Shows keyword clusters directly in search results without leaving Google or Bing Completely free with no account needed Eliminates need to switch between multiple SEO tools Groups keywords by search intent for better content alignment	Runs entirely offline with no external server storage of your captures Uses spaced repetition to surface passages you are most likely to forget No paid tier or premium features planned
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	11 no change since last check	4 no change since last check
Trust Flow (Majestic)	3	6
Citation Flow (Majestic)	23	15
Referring domains (Majestic)	50	3

4 details filled in for both companies.

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