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yellow · warm

#bacf39

a balanced, vivid yellow · warm · closest name: Yellow Green

Token name suggestion: Studio Brass

RGB
186, 207, 57
HSL
68°, 61%, 52%
CMYK
10, 0, 73, 19
Luminance
0.5536

#bacf39 is a balanced vivid yellow, 68° on the wheel and 32/100 on the cool side. Put black text on it (12.07:1). As text it scores 1.74:1 on white — use #6D7A1E instead. Nearest name is Yellow Green, nearest Tailwind family is lime.

hsl(68 61% 52%)rgb(186 207 57)Base step 600AAA inkWarm

At a glance

Every number on this page in one read: what #bacf39 is made of, how bright it looks, and which way it leans.

Hex
#bacf39
Hue
68°
yellow
Saturation
61%
vivid
Lightness
52%
balanced
Brightness
81%
HSV value
Perceived
74%
weighted brightness
Luminance
0.5536
WCAG relative
Temperature
Warm
32/100 cool
Color family
Yellow
Tone
Vivid
Best ink
Black
12.07:1
Closest name
Yellow Green
ΔE2000 5.8
Chroma
72.4
LCH, 0–130ish
OKLCH L
0.812
perceptual lightness
Tailwind
lime
500 · ΔE 8.7
Web-safe
#CCCC33
nearest of 216
Where it sits
Hue68° of 360°
Saturation61%
Lightness52%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #bacf39.

Temperature
Warm ← → Cool32% cool

Reads warm. Warm and cool siblings keep the same lightness, so you can swap one in without redoing your contrast maths.

Luminance by channel
Red19%
Green81%
Blue1%

Green carries most of what the eye calls brightness — that is why WCAG weights it 0.7152.

Every format

HEX#bacf39
HEX (8-digit)#bacf39ff
RGBrgb(186, 207, 57)
RGBArgba(186, 207, 57, 1)
HSLhsl(68, 61%, 52%)
HSV / HSBhsv(68, 72%, 81%)
HWBhwb(68 22% 19%)
CMYKcmyk(10%, 0%, 73%, 19%)
LABlab(79.3 -25.8 67.6)
LCHlch(79.3 72.4 110.9)
OKLCHoklch(0.812 0.169 117.3)
XYZ (D65)xyz(43.30, 55.36, 12.27)
Decimal12242745
Display P3color(display-p3 0.729 0.812 0.224)
Web-safe#CCCC33

Copy-ready code

every platformclick to select
/* CSS */
color: #bacf39;
background-color: #bacf39;
/* CSS custom property */
--brand: #bacf39;
/* Tailwind (arbitrary) */
class="text-[#bacf39] bg-[#bacf39]"
/* SCSS */
$brand: #bacf39;
/* SwiftUI */
Color(red: 0.729, green: 0.812, blue: 0.224)
/* UIKit */
UIColor(red: 0.729, green: 0.812, blue: 0.224, alpha: 1)
/* Android XML */
<color name="brand">#BACF39</color>
/* Android Compose */
Color(0xFFBACF39)
/* Flutter */
Color(0xFFBACF39)
/* Python / OpenCV (BGR) */
(57, 207, 186)
/* Python / PIL (RGB) */
(186, 207, 57)
/* Java AWT */
new Color(186, 207, 57)
/* .NET */
Color.FromArgb(255, 186, 207, 57)
/* OpenGL / Unity (0–1) */
(0.7294f, 0.8118f, 0.2235f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{186,207,57}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #bacf39 85%, white);
border-color: color-mix(in oklab, #bacf39 40%, transparent);
/* theme-aware in one line */
color: light-dark(#5C6719, #EAEED3);
/* relative colour syntax */
--hover: hsl(from #bacf39 h s calc(l - 7));

Design tokens

The same ramp in the four formats a team actually needs. Paste one and the whole palette lands with it.

css custom propertiesclick to select
:root {
  --brand-50: #FAFBF4;
  --brand-100: #F5F7E8;
  --brand-200: #EBF0CC;
  --brand-300: #E0E9A5;
  --brand-400: #D0DE78;
  --brand-500: #C0D34A;
  --brand-600: #bacf39;
  --brand-700: #93A428;
  --brand-800: #758320;
  --brand-900: #56601B;
  --brand-950: #363C11;
  --brand: #bacf39;
  --brand-ink: #000000;
  --brand-surface: #FAFAF4;
  --brand-border: #E6EDC0;
  --brand-hover: #A4B82D;
  --brand-pressed: #8B9B26;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #222414;
    --brand-ink: #EAEED3;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#FAFBF4',
        100: '#F5F7E8',
        200: '#EBF0CC',
        300: '#E0E9A5',
        400: '#D0DE78',
        500: '#C0D34A',
        600: '#bacf39',
        700: '#93A428',
        800: '#758320',
        900: '#56601B',
        950: '#363C11',
        DEFAULT: '#bacf39',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #FAFBF4,
  '100': #F5F7E8,
  '200': #EBF0CC,
  '300': #E0E9A5,
  '400': #D0DE78,
  '500': #C0D34A,
  '600': #bacf39,
  '700': #93A428,
  '800': #758320,
  '900': #56601B,
  '950': #363C11,
);
$brand-base: #bacf39;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#FAFBF4", "$type": "color" },
      "100": { "$value": "#F5F7E8", "$type": "color" },
      "200": { "$value": "#EBF0CC", "$type": "color" },
      "300": { "$value": "#E0E9A5", "$type": "color" },
      "400": { "$value": "#D0DE78", "$type": "color" },
      "500": { "$value": "#C0D34A", "$type": "color" },
      "600": { "$value": "#bacf39", "$type": "color" },
      "700": { "$value": "#93A428", "$type": "color" },
      "800": { "$value": "#758320", "$type": "color" },
      "900": { "$value": "#56601B", "$type": "color" },
      "950": { "$value": "#363C11", "$type": "color" }
    },
    "brandInk": { "$value": "#000000", "$type": "color" }
  }
}

Best text color

Only one of black and white can be right. This is the one, with the number that proves it.

Readable at a glance#000000 on #bacf39 · 12.07:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 1.74:1
AA fail · AA large fail · AAA fail
Aa
Black text · 12.07:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #bacf39 as text scores 1.74:1 on white and 12.07:1 on black.
Best tinted ink on it, if plain black or white feels flat: #5C6719 at 3.54:1.

Make it accessible

A contrast checker tells you that you failed. This tells you what to ship instead — same hue, same saturation, lightness moved only as far as WCAG demands.

The quick fox
#6D7A1E · 4.72:1
AA on white−22% L
#6D7A1E
The quick fox
#545E17 · 7.02:1
AAA on white−29% L
#545E17
The quick fox
#bacf39 · 12.07:1
AA on blackalready passes
#bacf39
The quick fox
#bacf39 · 12.07:1
AAA on blackalready passes
#bacf39

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #8B9B26 is enough for headings on white. Non-text elements such as icons, chart strokes and focus rings also sit at 3:1 under WCAG 2.2 (1.4.11).

Accessibility — WCAG contrast

Aa
#bacf39 on white: 1.74:1
AA ✗ fail · AA-large · AAA
Aa
#bacf39 on black: 12.07:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #bacf39 as text on that neutral, and that neutral as text on #bacf39.

NeutralRatioBoth directions
White1.74:1AaAa
Slate 501.66:1AaAa
Slate 1001.59:1AaAa
Slate 2001.41:1AaAa
Slate 3001.17:1AaAa
Slate 4001.47:1AaAa
Slate 5002.74:1AaAa
Slate 6004.36:1AaAa
Slate 7005.95:1AaAa
Slate 8008.41:1AaAa
Slate 90010.26:1AaAa
Black12.07:1AaAa
Colour vision deficiency
true color
protanopia · #DDC41B
deuteranopia · #DBC546
tritanopia · #C5C3B2

Roughly one man in twelve has some form of colour vision deficiency. If any of the three panels above is hard to tell apart from a neighbouring colour in your palette, add a shape, an icon or a label so the meaning does not rest on hue alone.

Color scale — 50 to 950

A Tailwind-shaped ramp built around this exact hex. #bacf39 is pinned to step 600; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#FAFBF4
#F5F7E8
#EBF0CC
#E0E9A5
#D0DE78
#C0D34A
#bacf39
#93A428
#758320
#56601B
#363C11
Base = 600Lightest = 50 · #FAFBF4Darkest = 950 · #363C11Text step on white = 900
Perceptual ramp — OKLCH

The same eleven steps expressed in OKLCH, where equal lightness numbers actually look equally spaced. HSL ramps go muddy in the yellows and washed out in the blues; this one does not. Modern browsers render it natively — the hex ramp above is the fallback.

50100200300400500600700800900950
oklch tokensclick to select
:root {
  --brand-50: oklch(0.97 0.042 117.3);
  --brand-100: oklch(0.94 0.067 117.3);
  --brand-200: oklch(0.88 0.101 117.3);
  --brand-300: oklch(0.80 0.132 117.3);
  --brand-400: oklch(0.72 0.155 117.3);
  --brand-500: oklch(0.64 0.169 117.3);
  --brand-600: oklch(0.56 0.169 117.3);
  --brand-700: oklch(0.48 0.159 117.3);
  --brand-800: oklch(0.40 0.142 117.3);
  --brand-900: oklch(0.32 0.118 117.3);
  --brand-950: oklch(0.24 0.093 117.3);
}

Colors that work with #bacf39

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#000000
Black wins here
Surface#FAFAF4
Tinted page background
Border#E6EDC0
Hairlines and dividers
Muted text#909B4B
Captions on the surface
Accent#3446D4
Second voice, not a rival
Dark variant#5C6719
Hover, pressed, headers
Light variant#F8FAEA
Selected rows, tints
Dark surface#222414
Dark-mode background
Hover#A4B82D
One step down in lightness
Pressed#8B9B26
Two steps down
Disabled#C7CBAD
Chroma pulled out
Focus ring#C8DE3E
Offset from the fill so it reads
Light mode
Everything in its place

Surface, border, heading and body all derive from this one hue, so the screen stays coherent without a second palette.

Primary actionSecondaryBadge
Dark mode
Same hue, inverted

Lightness flips, hue holds. The accent stays the anchor in both themes.

Primary actionSecondaryAccent

In real components

The same eight roles, wired into the interface patterns you will actually build with them. Every state below is a computed value, not a mock-up.

Buttons and states
Save changesHoverPressedDisabled
OutlineSubtleLinkFocused
Form field
you@company.com

Focus ring uses the light variant so the field still reads as one shape.

Send me product updates
Notice
Your export is ready

The file stays available for seven days. Download it before it expires.

NewBetaDraft
Data
Storage used68%
Acme LtdActive
NorthwindTrial
GlobexActive

How to use #bacf39

Derived from its contrast, chroma and lightness — not from taste.

Works well for
  • Text and icons on dark surfaces
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Brand accents, badges and data highlights
  • Chart series and data categories
Use with care
  • Text of any size on white — fails WCAG AA
  • Full-page backgrounds — tiring over long sessions
  • Thin strokes and 1px borders — they disappear on light UI
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
Not as text
Safe as a fill behind white type
No — use #5C6719
Safe as a 1px border on white
No — use #8B9B26

Meaning and mood

What a colour in this family tends to signal, and how this particular chroma and lightness change the reading.

optimisticalertcheap-and-cheerfulvisible

The most visible hue at low light levels, which is why it owns warnings, hazard tape and value retail.

This is a confident chroma: strong enough to lead a brand, restrained enough to live in an interface all day. The mid lightness keeps it versatile in both themes.

Worth knowing

Almost never passes contrast against white. Treat it as a surface or a marker, not as text.

Reads as
  • FormalityMedium
  • EnergyMedium-high
  • Weight48/100
  • TemperatureWarm
  • ApproachabilityHigh

Colour associations are cultural and vary by market. Treat these as a starting point for a conversation with your audience, not a finding about them.

Similar colors

One move away from this hex in each direction. Every swatch is its own page.

Color relationships

The wheel positions with their names attached, so you can grab the one you actually need.

Complementary#4E39CF
Analogous left#CF9939
Analogous right#6FCF39
Split-complement 1#396FCF
Split-complement 2#9939CF
Triadic 1#39BACF
Triadic 2#CF39BA
Tetradic#39CF99
On the wheel
Base+30°−30°+120°+240°+180°68°

#bacf39 sits at 68°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red72.9%
Green81.2%
Blue22.4%
R · 0–255
186
0xba
G · 0–255
207
0xcf
B · 0–255
57
0x39

CMYK percentages

Cyan10.1%
Magenta0.0%
Yellow72.5%
Key (black)18.8%

Total ink coverage is 101%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#bacf39 text on a black background

contrast 12.07:1

Card sample

#bacf39 text on a white background

contrast 1.74:1

Card sample

#bacf39 on grey

1.59:1

#bacf39 on its own surface

1.66:1

#bacf39 on its dark surface

9.07:1

CSS3 live lab

Text font color

The quick brown fox

color: #bacf39;
Background color
Panel with #bacf39 background
background-color: #bacf39;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #bacf39;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(186, 207, 57, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(186, 207, 57, 0.45);
Border & gradient
Gradient panel
border: 3px solid #bacf39;
background: linear-gradient(135deg, #bacf39, #56CF39);
Gradient text

Gradient headline

background: linear-gradient(90deg, #bacf39, #39CF42);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #bacf39;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #bacf39;
caret-color: #bacf39;
Left rule
Pull quote or callout
border-left: 4px solid #bacf39;
Ring + tint
Selected chip
background: #F8FAEA;
box-shadow: inset 0 0 0 2px #bacf39;
Conic badge
68%
background: conic-gradient(#bacf39 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #bacf39 over white; the bottom row is the same alpha over a checkerboard, so you can see what survives on a photo or a video.

Bottom row of hexes is the flattened result over white — use those when a design tool refuses transparency, or when you need a solid fallback.

alpha in every syntaxclick to select
rgba(186, 207, 57, 0.5)
rgb(186 207 57 / 50%)
#bacf3980
hsl(68 61% 52% / 50%)
color-mix(in srgb, #bacf39 50%, transparent)
Alpha8-digit hexFlat on white
10%#bacf391a#F8FAEB
20%#bacf3933#F1F5D7
40%#bacf3966#E3ECB0
60%#bacf3999#D6E288
80%#bacf39cc#C8D961

Gradients from #bacf39

Six recipes, each built from this hex and shown with the exact CSS that produced it.

Elevation
Same hue, three lightnesses — safe anywhere
background: linear-gradient(135deg, #CBDB6A, #bacf39 45%, #5C6719);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #bacf39, #3DBC2E);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #bacf39, #4E39CF);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #D4E183 0%, #bacf39 45%, #5C6719 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #FAFAF4, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #D9A462 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #76D552 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #5C6719 0%, transparent 65%), #bacf39;

Monochromatic scale

Palettes built from #bacf39

Shades — darker

Tints — lighter

Tones — desaturated

Color harmonies

Nearest named colors

Ranked with CIEDE2000 across all 139 CSS keywords. Under ΔE 2 the eye stops telling them apart; over ΔE 10 they are plainly different colors.

#bacf39 in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
RetailLeisureEnergyWarning systems
Common UI roles
ButtonsLinksFocus statesCharts
Print note

Converts to four-color process without much drama. Proof it anyway.

On screens

Holds up across typical panel gamma. Still worth checking on an uncalibrated laptop, where mid-tones shift most.

In dark mode

Usable as-is on a dark surface at 12.07:1.

Explore nearby colors

Small, deliberate steps away from this hex — useful when you are hunting for the version of a colour that finally feels right.

#bacf39, answered

What color is #bacf39?

#bacf39 is a balanced vivid yellow, closest to Yellow Green (ΔE2000 5.8). It sits at 68° on the hue wheel with 61% saturation and 52% lightness, which reads as warm.

What is the RGB value of #bacf39?

rgb(186, 207, 57) — 186 red, 207 green and 57 blue out of 255, or 72.9% / 81.2% / 22.4% by channel.

What is #bacf39 in HSL and HSV?

hsl(68, 61%, 52%) and hsv(68, 72%, 81%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #bacf39 a light or a dark color?

It is a light color. Relative luminance is 0.5536 and perceived brightness is 74%, so black text on it reaches 12.07:1.

Should I use black or white text on #bacf39?

Black. It scores 12.07:1 against #bacf39, versus 1.74:1 for white — AAA at any size.

Is #bacf39 accessible on a white background?

#bacf39 on white scores 1.74:1, which fails WCAG AA at every size. Darken it to #6D7A1E to reach 4.5:1, or #545E17 for 7:1.

What is the complementary color of #bacf39?

#4E39CF sits directly opposite on the wheel. Softer options are the split-complements #396FCF and #9939CF, which give the same contrast with far less vibration.

What colors go well with #bacf39?

For interface work: #FAFAF4 as the surface, #E6EDC0 for borders, #909B4B for secondary text, #3446D4 as an accent and #5C6719 for hover and pressed states. For a palette, the analogous pair #CF9939 and #6FCF39 stays calm, while #4E39CF is the loudest partner.

What is #bacf39 in CMYK for printing?

cmyk(10%, 0%, 73%, 19%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #bacf39 warm or cool?

Warm — it scores 32 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #CFAD39; nudged cooler, #83D237.

Which Tailwind color is closest to #bacf39?

The lime family — its 500 step is #84cc16, ΔE2000 8.7 away. That is a visible difference, so define #bacf39 as a custom token rather than reaching for the built-in.

How do I use #bacf39 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#bacf39] or text-[#bacf39], or register the whole ramp under theme.extend.colors.brand so you get bg-brand-500 and friends. The generated 50–950 scale on this page is ready to paste into your config.

What is #bacf39 with 50% opacity?

rgba(186, 207, 57, 0.5), or #bacf3980 in eight-digit hex. Over white that composites to #DDE79C; over black, #5D681D.

Is #bacf39 a web-safe color?

No. The nearest web-safe colour is #CCCC33, ΔE2000 4.8 away. The palette only matters for legacy displays and some email clients now.

What does the color #bacf39 mean?

As a yellow, it reads optimistic, alert, cheap-and-cheerful. The most visible hue at low light levels, which is why it owns warnings, hazard tape and value retail. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #bacf39?

The safest is same-hue elevation: linear-gradient(135deg, #CBDB6A, #bacf39 45%, #5C6719). For more colour, a short hue run to #3DBC2E keeps it rich without turning muddy.

Work with #bacf39 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #bacf39 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.