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Web DeveloperVisBug
Free

Free and open source under the GPL.

 Free

The open-source extension is available without a license fee.

Browser extension Web, Browser extension
  • Dozens of page manipulations one click away, many still missing from devtools
  • Same toolbar across Chrome, Firefox and Edge
  • Edit spacing, type and colour on a live page without touching developer tools
  • Measurement and accessibility inspection built into the same toolbar
  • Much of its original value is now covered by built-in developer tools
  • Interface is a dense menu-driven toolbar
  • Changes are temporary and vanish on reload
  • Complex layouts can behave unpredictably when dragged
Browser extension Browser extension
Open source Open source
License: GPL-3.0 License: Apache-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.