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subtitle.im vs Kernline

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

subtitle.im compared with Kernline
Detailsubtitle.im logo subtitle.imKernline logo Kernline
What it doesYouTube captions, on when needed, off when they get in the way. 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: $0, no sign-up needed, 10 successfully handled videos in total with no monthly reset. Pro subscription: $17.99 / year, billed annually. Pro Lifetime: $29.99 / once, pay once for ongoing maintenance and all major and minor updates. 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
  • Automatic caption control - follow YouTube, auto-open, or auto-close
  • Local OCR detects burned-in subtitles
  • Handle duplicate captions with separate settings
  • Manage different languages in captions
  • Channel-specific caption rules (Pro)
  • Video-specific rules (Pro)
  • Remember confirmed caption closures (Pro)
  • Restore captions if hidden by mistake
  • Privacy-first local processing
  • 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
  • All processing happens locally in your browser with no video frames uploaded
  • Automatically detect burned-in subtitles and handle them separately from YouTube captions
  • Set caption preferences at global, channel, or video level
  • Free to try with 10 videos before upgrading
  • No email or account required for free use
  • 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)31 −1 (down) since last checkNot checked yet no change since last check
Trust Flow (Majestic)150
Citation Flow (Majestic)240
Referring domains (Majestic)360

5 details filled in for both companies.

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