Keyword Cluster vs MarklyKit

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 MarklyKit
Detail	Keyword Cluster	MarklyKit
What it does	Chrome extension for keyword clusters and SEO insights	Browser extension for highlighting, annotating, and taking notes on any webpage
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	Free plan includes unlimited highlighting and drawing with local-only storage. Pro plan costs $7.99/month with a 7-day free trial, including cloud sync, unlimited sticky notes, PDF export, AI connectors, and API access.
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	Privacy masking with blur tool for sensitive data AI connectors for Claude, ChatGPT, and Grok via MCP server Local-first storage with optional cloud sync on Pro plan Keyboard shortcuts for rapid tool switching Focus mode to toggle annotation visibility Browser PDF highlighting support
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	Designed specifically for academic research with citation-ready PDF exports Built-in MCP server enabling direct AI integration without copy-pasting No account required to start highlighting immediately
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	Not checked yet no change since last check
Trust Flow (Majestic)	3	0
Citation Flow (Majestic)	23	6
Referring domains (Majestic)	50	2

4 details filled in for both companies.

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