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OpenCapture vs 30 Seconds of Knowledge

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 30 Seconds of Knowledge
DetailOpenCapture logo OpenCapture30 Seconds of Knowledge logo 30 Seconds of Knowledge
What it doesFree full-page screenshot browser extension for Chrome, Edge and Firefox Keep your engineering skills sharp with one real code snippet on every new tab
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Free
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
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)
  • Support for JavaScript, Python, React, Git, C++, C#, CSS, Dart, Go, HTML, PHP, and Interview Questions
  • Live Preview for CSS snippets
  • Random snippet or browse favorites and all snippets
  • Available on Chrome, Firefox, Edge, Brave, and Arc
  • Open source project on GitHub
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
  • Helps prevent engineering skill atrophy in the age of AI
  • One real code snippet delivered every new tab without requiring courses or streaks
  • 25,000+ developers using the extension with 1,000+ GitHub stars
  • Featured as #2 Product of the Day on Product Hunt
  • 5-star rating on Chrome Web Store
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 check10 +1 (up) since last check
Trust Flow (Majestic)214
Citation Flow (Majestic)2120
Referring domains (Majestic)2573

5 details filled in for both companies.

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