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green · cool

#23fd66

a balanced, electric green · cool · closest name: Spring Green

Token name suggestion: Signal Moss

RGB
35, 253, 102
HSL
138°, 98%, 57%
CMYK
86, 0, 60, 1
Luminance
0.7157

#23fd66 is a balanced electric green, 138° on the wheel and 70/100 on the cool side. Put black text on it (15.31:1). As text it scores 1.37:1 on white — use #01862A instead. Nearest name is Spring Green, nearest Tailwind family is green.

hsl(138 98% 57%)rgb(35 253 102)Base step 500AAA inkCool

At a glance

Every number on this page in one read: what #23fd66 is made of, how bright it looks, and which way it leans.

Hex
#23fd66
Hue
138°
green
Saturation
98%
electric
Lightness
57%
balanced
Brightness
99%
HSV value
Perceived
78%
weighted brightness
Luminance
0.7157
WCAG relative
Temperature
Cool
70/100 cool
Color family
Green
Tone
Electric
Best ink
Black
15.31:1
Closest name
Spring Green
ΔE2000 3
Chroma
97.0
LCH, 0–130ish
OKLCH L
0.869
perceptual lightness
Tailwind
green
500 · ΔE 13.3
Web-safe
#33FF66
nearest of 216
Where it sits
Hue138° of 360°
Saturation98%
Lightness57%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #23fd66.

Temperature
Warm ← → Cool70% cool

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

Luminance by channel
Red0%
Green98%
Blue1%

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

Every format

HEX#23fd66
HEX (8-digit)#23fd66ff
RGBrgb(35, 253, 102)
RGBArgba(35, 253, 102, 1)
HSLhsl(138, 98%, 57%)
HSV / HSBhsv(138, 86%, 99%)
HWBhwb(138 14% 1%)
CMYKcmyk(86%, 0%, 60%, 1%)
LABlab(87.8 -78.2 57.5)
LCHlch(87.8 97.0 143.7)
OKLCHoklch(0.869 0.250 147.2)
XYZ (D65)xyz(38.21, 71.56, 24.37)
Decimal2358630
Display P3color(display-p3 0.137 0.992 0.400)
Web-safe#33FF66

Copy-ready code

every platformclick to select
/* CSS */
color: #23fd66;
background-color: #23fd66;
/* CSS custom property */
--brand: #23fd66;
/* Tailwind (arbitrary) */
class="text-[#23fd66] bg-[#23fd66]"
/* SCSS */
$brand: #23fd66;
/* SwiftUI */
Color(red: 0.137, green: 0.992, blue: 0.400)
/* UIKit */
UIColor(red: 0.137, green: 0.992, blue: 0.400, alpha: 1)
/* Android XML */
<color name="brand">#23FD66</color>
/* Android Compose */
Color(0xFF23FD66)
/* Flutter */
Color(0xFF23FD66)
/* Python / OpenCV (BGR) */
(102, 253, 35)
/* Python / PIL (RGB) */
(35, 253, 102)
/* Java AWT */
new Color(35, 253, 102)
/* .NET */
Color.FromArgb(255, 35, 253, 102)
/* OpenGL / Unity (0–1) */
(0.1373f, 0.9922f, 0.4000f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{35,253,102}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #23fd66 85%, white);
border-color: color-mix(in oklab, #23fd66 40%, transparent);
/* theme-aware in one line */
color: light-dark(#017E28, #D3EEDB);
/* relative colour syntax */
--hover: hsl(from #23fd66 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: #F1FDF5;
  --brand-100: #E3FCEB;
  --brand-200: #C1FBD3;
  --brand-300: #90FEB2;
  --brand-400: #58FD8B;
  --brand-500: #23fd66;
  --brand-600: #02F34C;
  --brand-700: #02CA3F;
  --brand-800: #01A233;
  --brand-900: #067428;
  --brand-950: #044919;
  --brand: #23fd66;
  --brand-ink: #000000;
  --brand-surface: #F4FAF6;
  --brand-border: #C0EDCE;
  --brand-hover: #02FA4E;
  --brand-pressed: #02D743;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142419;
    --brand-ink: #D3EEDB;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F1FDF5',
        100: '#E3FCEB',
        200: '#C1FBD3',
        300: '#90FEB2',
        400: '#58FD8B',
        500: '#23fd66',
        600: '#02F34C',
        700: '#02CA3F',
        800: '#01A233',
        900: '#067428',
        950: '#044919',
        DEFAULT: '#23fd66',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F1FDF5,
  '100': #E3FCEB,
  '200': #C1FBD3,
  '300': #90FEB2,
  '400': #58FD8B,
  '500': #23fd66,
  '600': #02F34C,
  '700': #02CA3F,
  '800': #01A233,
  '900': #067428,
  '950': #044919,
);
$brand-base: #23fd66;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F1FDF5", "$type": "color" },
      "100": { "$value": "#E3FCEB", "$type": "color" },
      "200": { "$value": "#C1FBD3", "$type": "color" },
      "300": { "$value": "#90FEB2", "$type": "color" },
      "400": { "$value": "#58FD8B", "$type": "color" },
      "500": { "$value": "#23fd66", "$type": "color" },
      "600": { "$value": "#02F34C", "$type": "color" },
      "700": { "$value": "#02CA3F", "$type": "color" },
      "800": { "$value": "#01A233", "$type": "color" },
      "900": { "$value": "#067428", "$type": "color" },
      "950": { "$value": "#044919", "$type": "color" }
    },
    "brandInk": { "$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 #23fd66 · 15.31:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 1.37:1
AA fail · AA large fail · AAA fail
Aa
Black text · 15.31:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #23fd66 as text scores 1.37:1 on white and 15.31:1 on black.
Best tinted ink on it, if plain black or white feels flat: #017E28 at 3.81:1.

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
#01862A · 4.72:1
AA on white−30% L
#01862A
The quick fox
#01631F · 7.48:1
AAA on white−37% L
#01631F
The quick fox
#23fd66 · 15.31:1
AA on blackalready passes
#23fd66
The quick fox
#23fd66 · 15.31:1
AAA on blackalready passes
#23fd66

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #02A935 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
#23fd66 on white: 1.37:1
AA ✗ fail · AA-large · AAA
Aa
#23fd66 on black: 15.31:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #23fd66 as text on that neutral, and that neutral as text on #23fd66.

NeutralRatioBoth directions
White1.37:1AaAa
Slate 501.31:1AaAa
Slate 1001.25:1AaAa
Slate 2001.11:1AaAa
Slate 3001.08:1AaAa
Slate 4001.87:1AaAa
Slate 5003.47:1AaAa
Slate 6005.53:1AaAa
Slate 7007.55:1AaAa
Slate 80010.67:1AaAa
Slate 90013.02:1AaAa
Black15.31:1AaAa
Colour vision deficiency
true color
protanopia · #FFE656
deuteranopia · #EAD673
tritanopia · #00F7DD

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. #23fd66 is pinned to step 500; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F1FDF5
#E3FCEB
#C1FBD3
#90FEB2
#58FD8B
#23fd66
#02F34C
#02CA3F
#01A233
#067428
#044919
Base = 500Lightest = 50 · #F1FDF5Darkest = 950 · #044919Text 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 0.062 147.2);
  --brand-100: oklch(0.94 0.100 147.2);
  --brand-200: oklch(0.88 0.150 147.2);
  --brand-300: oklch(0.80 0.195 147.2);
  --brand-400: oklch(0.72 0.230 147.2);
  --brand-500: oklch(0.64 0.250 147.2);
  --brand-600: oklch(0.56 0.250 147.2);
  --brand-700: oklch(0.48 0.235 147.2);
  --brand-800: oklch(0.40 0.210 147.2);
  --brand-900: oklch(0.32 0.175 147.2);
  --brand-950: oklch(0.24 0.137 147.2);
}

Colors that work with #23fd66

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#F4FAF6
Tinted page background
Border#C0EDCE
Hairlines and dividers
Muted text#4B9B63
Captions on the surface
Accent#CC00C0
Second voice, not a rival
Dark variant#017E28
Hover, pressed, headers
Light variant#E6FFED
Selected rows, tints
Dark surface#142419
Dark-mode background
Hover#02FA4E
One step down in lightness
Pressed#02D743
Two steps down
Disabled#BCD4C4
Chroma pulled out
Focus ring#36FF73
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 #23fd66

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
  • Status meaning — pair it with an icon or label, never colour alone
  • 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 #017E28
Safe as a 1px border on white
No — use #02A935

Meaning and mood

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

safegrowingnaturalpermissive

Green means go, well, and grown. It carries finance, sustainability and health with almost no explanation needed.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. The mid lightness keeps it versatile in both themes.

Worth knowing

Red/green pairs are the most common colour-blindness failure — never let the two carry meaning alone.

Reads as
  • FormalityLow
  • EnergyHigh
  • Weight44/100
  • TemperatureCool
  • ApproachabilityReserved

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#FD23BA
Analogous left#4DFD23
Analogous right#23FDD3
Split-complement 1#D323FD
Split-complement 2#FD234D
Triadic 1#6623FD
Triadic 2#FD6623
Tetradic#234DFD
On the wheel
Base+30°−30°+120°+240°+180°138°

#23fd66 sits at 138°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red13.7%
Green99.2%
Blue40.0%
R · 0–255
35
0x23
G · 0–255
253
0xfd
B · 0–255
102
0x66

CMYK percentages

Cyan86.2%
Magenta0.0%
Yellow59.7%
Key (black)0.8%

Total ink coverage is 147%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#23fd66 text on a black background

contrast 15.31:1

Card sample

#23fd66 text on a white background

contrast 1.37:1

Card sample

#23fd66 on grey

1.25:1

#23fd66 on its own surface

1.30:1

#23fd66 on its dark surface

11.81:1

CSS3 live lab

Text font color

The quick brown fox

color: #23fd66;
Background color
Panel with #23fd66 background
background-color: #23fd66;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #23fd66;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(35, 253, 102, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(35, 253, 102, 0.45);
Border & gradient
Gradient panel
border: 3px solid #23fd66;
background: linear-gradient(135deg, #23fd66, #23FDF7);
Gradient text

Gradient headline

background: linear-gradient(90deg, #23fd66, #23CCFD);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #23fd66;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #23fd66;
caret-color: #23fd66;
Left rule
Pull quote or callout
border-left: 4px solid #23fd66;
Ring + tint
Selected chip
background: #E6FFED;
box-shadow: inset 0 0 0 2px #23fd66;
Conic badge
68%
background: conic-gradient(#23fd66 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #23fd66 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(35, 253, 102, 0.5)
rgb(35 253 102 / 50%)
#23fd6680
hsl(138 98% 57% / 50%)
color-mix(in srgb, #23fd66 50%, transparent)
Alpha8-digit hexFlat on white
10%#23fd661a#E9FFF0
20%#23fd6633#D3FFE0
40%#23fd6666#A7FEC2
60%#23fd6699#7BFEA3
80%#23fd66cc#4FFD85

Gradients from #23fd66

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, #60FE90, #23fd66 45%, #017E28);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #23fd66, #05EFFD);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #23fd66, #FD23BA);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #7EFEA5 0%, #23fd66 45%, #017E28 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4FAF6, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #84FD56 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #41FDE9 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #017E28 0%, transparent 65%), #23fd66;

Monochromatic scale

Palettes built from #23fd66

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.

#23fd66 in the real world

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

Industries
SustainabilityFinanceHealth and wellnessAgriculture
Common UI roles
ButtonsLinksFocus statesCharts
Print note

Sits outside most CMYK gamuts — expect a duller press result, or specify a spot ink.

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 15.31:1.

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.

#23fd66, answered

What color is #23fd66?

#23fd66 is a balanced electric green, closest to Spring Green (ΔE2000 3). It sits at 138° on the hue wheel with 98% saturation and 57% lightness, which reads as cool.

What is the RGB value of #23fd66?

rgb(35, 253, 102) — 35 red, 253 green and 102 blue out of 255, or 13.7% / 99.2% / 40% by channel.

What is #23fd66 in HSL and HSV?

hsl(138, 98%, 57%) and hsv(138, 86%, 99%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #23fd66 a light or a dark color?

It is a light color. Relative luminance is 0.7157 and perceived brightness is 78%, so black text on it reaches 15.31:1.

Should I use black or white text on #23fd66?

Black. It scores 15.31:1 against #23fd66, versus 1.37:1 for white — AAA at any size.

Is #23fd66 accessible on a white background?

#23fd66 on white scores 1.37:1, which fails WCAG AA at every size. Darken it to #01862A to reach 4.5:1, or #01631F for 7:1.

What is the complementary color of #23fd66?

#FD23BA sits directly opposite on the wheel. Softer options are the split-complements #D323FD and #FD234D, which give the same contrast with far less vibration.

What colors go well with #23fd66?

For interface work: #F4FAF6 as the surface, #C0EDCE for borders, #4B9B63 for secondary text, #CC00C0 as an accent and #017E28 for hover and pressed states. For a palette, the analogous pair #4DFD23 and #23FDD3 stays calm, while #FD23BA is the loudest partner.

What is #23fd66 in CMYK for printing?

cmyk(86%, 0%, 60%, 1%). This is a screen-to-ink approximation — a color this saturated sits outside most CMYK gamuts and will print duller than it looks here.

Is #23fd66 warm or cool?

Cool — it scores 70 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #30FD23; nudged cooler, #21FFB7.

Which Tailwind color is closest to #23fd66?

The green family — its 500 step is #22c55e, ΔE2000 13.3 away. That is a visible difference, so define #23fd66 as a custom token rather than reaching for the built-in.

How do I use #23fd66 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#23fd66] or text-[#23fd66], 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 #23fd66 with 50% opacity?

rgba(35, 253, 102, 0.5), or #23fd6680 in eight-digit hex. Over white that composites to #91FEB3; over black, #127F33.

Is #23fd66 a web-safe color?

No. The nearest web-safe colour is #33FF66, ΔE2000 0.6 away. The palette only matters for legacy displays and some email clients now.

What does the color #23fd66 mean?

As a green, it reads safe, growing, natural. Green means go, well, and grown. It carries finance, sustainability and health with almost no explanation needed. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #23fd66?

The safest is same-hue elevation: linear-gradient(135deg, #60FE90, #23fd66 45%, #017E28). For more colour, a short hue run to #05EFFD keeps it rich without turning muddy.

Work with #23fd66 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #23fd66 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.