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OpenCapture vs Kernline

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

OpenCapture compared with Kernline
DetailOpenCapture logo OpenCaptureKernline logo Kernline
What it doesFree full-page screenshot browser extension for Chrome, Edge and Firefox Give your AI the exact component from any site, not a screenshot
StageNot given Not given
FoundedNot given Not given
Based inNot given ZA
Pricing modelFreemium Freemium
PricingFree: Full-page, visible-area and selected-area capture, crop, draw, text, shapes, blur, unlimited undo, and export to PNG or PDF. Supporter: $5 for 1,000 credits (one-time, includes tiled logo or text watermark with custom opacity, position, and angle). Free: $0 with 3 Copy for AI and 3 Component captures a day. Pro yearly: $36/year ($3/month). Pro monthly: $6/month. Lifetime Pro: $59 one-time payment.
Key features
  • Full-page screenshot capture
  • Visible-area and selected-area capture modes
  • Crop and resize images
  • Draw, text and shapes annotation
  • Blur sensitive information
  • Unlimited undo
  • Export to PNG or PDF
  • Capture history with last 50 screenshots
  • Tiled watermark (Supporter feature)
  • Component capture as HTML, React, or Vue with Tailwind
  • Tailwind v3 and v4 class export
  • Design token export as CSS variables or Tailwind theme
  • CSS inspector with box model and typography
  • Asset list for images, SVGs, icons, and fonts
  • Pixel-perfect mockup overlay with layers
  • Single-element or full-page Tailwind scanning
  • Offline inspection and copy functionality
What makes it different
  • Completely open source under AGPL-3.0-or-later so users can verify no data collection
  • All processing done locally with no uploads unless buying credits
  • No account required for all core features
  • One-time payment for Supporter feature instead of subscription
  • Stitches full pages into seamless single images
  • Works entirely in your browser with no page uploads or tracking
  • Runs only on the tab you open and never uploads the page
  • No ads, tracking, or data selling
  • Copy real styles and tokens from live websites instead of screenshots
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)1 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)210
Citation Flow (Majestic)210
Referring domains (Majestic)250

5 details filled in for both companies.

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