Kernline
Kernline vs VisBug
VisBug is free and open source (Google Chrome Labs).
VisBug is for tweaking layout, colour, and type on the live page. Kernline is for exporting CSS, Tailwind, design tokens, assets, and AI-ready component bundles when you rebuild elsewhere. Different jobs; many teams use both.
| Topic | VisBug | Kernline |
|---|---|---|
| Pricing | Free, open source | Free tier; Pro $36/year or $59 Lifetime |
| In-page editing | Move, nudge, colour, measure, guides | Inspect and export; overlay mockups for QA |
| Copy CSS / Tailwind | Limited export focus | Core workflow with Tailwind v3/v4 |
| Copy for AI / components | No | Copy for AI and component capture |
| Design tokens | No | Pro page-wide export |
| Pro licence / support | N/A | Polar checkout; 14-day refund |
See also: CSS Scan, CSS Peeper, DivMagic.