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MarklyKit vs Content SEO Check

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

MarklyKit compared with Content SEO Check
DetailMarklyKit logo MarklyKitContent SEO Check logo Content SEO Check
What it doesBrowser extension for highlighting, annotating, and taking notes on any webpage See your page's SEO structure in one click
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Free
PricingFree 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. Not given
Key features
  • 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
  • Analyze headings (H1–H6) with structure warnings
  • Internal link checker with anchor text and destination URLs
  • External link audit with rel attributes
  • In-content link analysis with word count
  • Clean Markdown export with filtered content
What makes it different
  • 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
  • No account or login required
  • Completely free to download and use
  • Analyzes locally without sending data externally
  • Five focused tools in one lightweight extension
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)Not checked yet no change since last check45 no change since last check
Trust Flow (Majestic)017
Citation Flow (Majestic)631
Referring domains (Majestic)2161

4 details filled in for both companies.

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