Frontend debugging and CSS developer tools
Colors, contrast, layout, effects, and responsive CSS — designed in the browser.
Frontend work is a constant loop of small visual adjustments, and switching to a heavy design tool for each one breaks flow. This workflow keeps the common CSS jobs in the browser: convert between color formats and pick new ones, check contrast so text stays accessible, generate flexbox and grid layouts, build shadows and gradients, handle responsive breakpoints and device safe-areas, then format the CSS you produced. Each tool gives you copy-paste output you can drop straight into a stylesheet.
- 1
Convert and pick colors
Move a color between HEX, RGB, and HSL, or pick a new one — the starting point for most styling changes.
- 2
Check contrast for accessibility
Verify a text/background pair meets WCAG AA or AAA contrast ratios before you ship it, not after an audit flags it.
- 3
Build the layout
Generate the flexbox or CSS grid rules for a layout visually, then copy the exact properties instead of guessing at them.
- 4
Generate effects
Build a box-shadow or a gradient with live preview and copy the CSS — far faster than hand-tuning numbers.
- 5
Handle responsive and safe-area
Generate media queries for your breakpoints and the env(safe-area-inset-*) CSS that keeps content clear of notches and home indicators.
- Media Query GeneratorBuild media queries from feature toggles - width, orientation, dark mode, reduced motion, hover, pointer, print - and export CSS, SCSS mixins, or Tailwind variants
- Safe Area CalculatorVisualize notch and home-indicator insets and generate env(safe-area-inset) CSS, Tailwind, and recipes
- 6
Format the CSS
Tidy the generated or hand-written CSS into consistent, readable style before committing it.
Frequently asked questions
Use a contrast checker to measure the ratio between your text and background colors. WCAG AA requires at least 4.5:1 for normal text and 3:1 for large text; AAA raises that to 7:1. Check the pair before shipping — fixing contrast after an accessibility audit is far more disruptive than choosing an accessible color up front.
Use a visual generator: set the number of columns, gaps, and alignment with controls and copy the exact grid-template or flex properties it produces. This avoids the trial-and-error of hand-writing values and gives you a correct baseline you can then tweak.