Find the closest Bootstrap class
Given any HEX, return the nearest Bootstrap 5 utility color: <code>primary</code>, <code>blue-500</code>, <code>gray-700</code>, etc.
How to find the closest Bootstrap color
Paste a HEX, see which Bootstrap utility maps closest — then copy as text-*, bg-*, or border-*.
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Paste a HEX
From your design or brand color.
Colors round-trip through a normalised OKLCH representation, so manipulations (lighten, mix, contrast) preserve perceptual uniformity per CSS Color 4.
inputOKLCHCSS Color 4perceptuallivein · colorhex · sRGB#0d6efd
loaded · normalisedOKLCH · ready - 02
Get match
Nearest utility class by RGB distance.
Format conversion handles
hex,rgb(),hsl(),oklch(),color(display-p3 …)with proper gamut mapping when crossing colour spaces.matchhex · rgb · hslP3gamut-mappedliveout · optionsprimary · liveprimary
options applied · livelive - 03
Pick prefix
Choose
text-*,bg-*, orborder-*for your use case.Contrast and accessibility checks evaluate against WCAG 2.2 AA (4.5:1) and AAA (7:1) thresholds; APCA is offered when contrast is the goal.
prefixWCAG 2.2APCAAA · AAAcontrastuse · convertedbg · readybg-primary
converted · liveWCAG-aware - 04
Copy & ship
Paste into your markup.
Copy formats any swatch in the chosen syntax (
#aabbcc,rgb(170 187 204), etc.); downloads emit CSS variable blocks or palette JSON.shipclipboardCSS varspalette JSONblobok · copiedready · done✓ Copied bg-primary
shipped · ready to shipsuccess
Colour work that survives accessibility audits
Use OKLCH for manipulation
OKLCH is perceptually uniform — lightness changes look uniform. hsl() isn’t, and produces muddy mid-tones.
Test against WCAG 2.2
4.5:1 for normal text (AA), 7:1 for AAA. Use Contrast Checker before shipping.
Mind gamut clipping
P3 colours that exceed sRGB get clipped on standard displays. Choose relative colorimetric in CSS Color 4.
Colour blindness affects 8%
Use the Color Blindness simulator to check critical UI before launch.
Don’t hardcode hex
Use CSS variables. Light/dark themes become trivial when colours are tokenised.
Dark mode isn’t inverted
Don’t simply invert lightness — desaturate slightly and re-pick accents. Pure-inverted UIs look harsh.
When to find Bootstrap matches
Theming, retrofitting, migrating from custom CSS.
Theme audit
Check whether a brand color is Bootstrap-compatible. Conversions go through OKLCH so perceptual lightness stays uniform across hues — a 50% L blue looks as bright as a 50% L yellow. HSL fakes this and produces muddy mid-tones, OKLCH solves it per CSS Color 4.
WCAG 2.2 AARefactor CSS
Replace inline HEX with utility classes. WCAG 2.2 contrast is sampled live for AA (4.5:1) and AAA (7:1) — flip foreground/background to test both directions. APCA is offered when contrast itself is the goal (e.g., dataviz).
P3-awareQuick prototyping
Stick to Bootstrap's palette without thinking. Output covers hex, rgb(), hsl(), oklch(), and color(display-p3 …) for CSS Color 4. Drop straight into Tailwind config, CSS custom properties, or Figma without re-typing values.
perceptually-uniformComponent libraries
Use named colors consistently across your library. Pair with the Contrast Checker before shipping any new theme. Catches accessibility regressions before they become bugs filed against you by users with low vision.
gamut-safeOnboarding
Help new devs find the right class quickly. Tokens drop straight into Figma variables, Tailwind config, or CSS custom properties. Theme switching becomes a single variable swap rather than a search-replace across stylesheets.
a11y-readyCross-tool
Bridge Figma to Bootstrap utility names. Gamut-aware: tools warn before you ship a P3 colour that clips on sRGB displays. Choose the appropriate fallback strategy (relative colorimetric vs perceptual) per CSS Color 4 spec.
design-tokenFrequently asked questions
Something missing?
Tell us what you need. We ship the top requests every two weeks.