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cyan · cool

#19fdbf

a balanced, electric cyan · cool · closest name: Aqua Marine

Token name suggestion: Atlas Glacier

RGB
25, 253, 191
HSL
164°, 98%, 55%
CMYK
90, 0, 25, 1
Luminance
0.7422

#19fdbf is a balanced electric cyan, 164° on the wheel and 81/100 on the cool side. Put black text on it (15.84:1). As text it scores 1.33:1 on white — use #018662 instead. Nearest name is Aqua Marine, nearest Tailwind family is emerald.

hsl(164 98% 55%)rgb(25 253 191)Base step 500AAA inkCool

At a glance

Every number on this page in one read: what #19fdbf is made of, how bright it looks, and which way it leans.

Hex
#19fdbf
Hue
164°
cyan
Saturation
98%
electric
Lightness
55%
balanced
Brightness
99%
HSV value
Perceived
80%
weighted brightness
Luminance
0.7422
WCAG relative
Temperature
Cool
81/100 cool
Color family
Cyan
Tone
Electric
Best ink
Black
15.84:1
Closest name
Aqua Marine
ΔE2000 5.7
Chroma
65.2
LCH, 0–130ish
OKLCH L
0.883
perceptual lightness
Tailwind
emerald
500 · ΔE 16.1
Web-safe
#00FFCC
nearest of 216
Where it sits
Hue164° of 360°
Saturation98%
Lightness55%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #19fdbf.

Temperature
Warm ← → Cool81% 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%
Green95%
Blue5%

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

Every format

HEX#19fdbf
HEX (8-digit)#19fdbfff
RGBrgb(25, 253, 191)
RGBArgba(25, 253, 191, 1)
HSLhsl(164, 98%, 55%)
HSV / HSBhsv(164, 90%, 99%)
HWBhwb(164 10% 1%)
CMYKcmyk(90%, 0%, 25%, 1%)
LABlab(89.0 -63.2 16.0)
LCHlch(89.0 65.2 165.8)
OKLCHoklch(0.883 0.179 166.8)
XYZ (D65)xyz(44.92, 74.21, 61.24)
Decimal1703359
Display P3color(display-p3 0.098 0.992 0.749)
Web-safe#00FFCC

Copy-ready code

every platformclick to select
/* CSS */
color: #19fdbf;
background-color: #19fdbf;
/* CSS custom property */
--brand: #19fdbf;
/* Tailwind (arbitrary) */
class="text-[#19fdbf] bg-[#19fdbf]"
/* SCSS */
$brand: #19fdbf;
/* SwiftUI */
Color(red: 0.098, green: 0.992, blue: 0.749)
/* UIKit */
UIColor(red: 0.098, green: 0.992, blue: 0.749, alpha: 1)
/* Android XML */
<color name="brand">#19FDBF</color>
/* Android Compose */
Color(0xFF19FDBF)
/* Flutter */
Color(0xFF19FDBF)
/* Python / OpenCV (BGR) */
(191, 253, 25)
/* Python / PIL (RGB) */
(25, 253, 191)
/* Java AWT */
new Color(25, 253, 191)
/* .NET */
Color.FromArgb(255, 25, 253, 191)
/* OpenGL / Unity (0–1) */
(0.0980f, 0.9922f, 0.7490f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{25,253,191}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #19fdbf 85%, white);
border-color: color-mix(in oklab, #19fdbf 40%, transparent);
/* theme-aware in one line */
color: light-dark(#017E5C, #D3EEE7);
/* relative colour syntax */
--hover: hsl(from #19fdbf 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: #F1FDFA;
  --brand-100: #E3FCF5;
  --brand-200: #C1FBEB;
  --brand-300: #90FEE0;
  --brand-400: #58FED1;
  --brand-500: #19fdbf;
  --brand-600: #02F3B1;
  --brand-700: #02CA94;
  --brand-800: #01A276;
  --brand-900: #067556;
  --brand-950: #044936;
  --brand: #19fdbf;
  --brand-ink: #000000;
  --brand-surface: #F4FAF9;
  --brand-border: #C0EDE0;
  --brand-hover: #02F0AF;
  --brand-pressed: #02CD96;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142420;
    --brand-ink: #D3EEE7;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F1FDFA',
        100: '#E3FCF5',
        200: '#C1FBEB',
        300: '#90FEE0',
        400: '#58FED1',
        500: '#19fdbf',
        600: '#02F3B1',
        700: '#02CA94',
        800: '#01A276',
        900: '#067556',
        950: '#044936',
        DEFAULT: '#19fdbf',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F1FDFA,
  '100': #E3FCF5,
  '200': #C1FBEB,
  '300': #90FEE0,
  '400': #58FED1,
  '500': #19fdbf,
  '600': #02F3B1,
  '700': #02CA94,
  '800': #01A276,
  '900': #067556,
  '950': #044936,
);
$brand-base: #19fdbf;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F1FDFA", "$type": "color" },
      "100": { "$value": "#E3FCF5", "$type": "color" },
      "200": { "$value": "#C1FBEB", "$type": "color" },
      "300": { "$value": "#90FEE0", "$type": "color" },
      "400": { "$value": "#58FED1", "$type": "color" },
      "500": { "$value": "#19fdbf", "$type": "color" },
      "600": { "$value": "#02F3B1", "$type": "color" },
      "700": { "$value": "#02CA94", "$type": "color" },
      "800": { "$value": "#01A276", "$type": "color" },
      "900": { "$value": "#067556", "$type": "color" },
      "950": { "$value": "#044936", "$type": "color" }
    },
    "brandInk": { "$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 #19fdbf · 15.84:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 1.33:1
AA fail · AA large fail · AAA fail
Aa
Black text · 15.84:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #19fdbf as text scores 1.33:1 on white and 15.84:1 on black.
Best tinted ink on it, if plain black or white feels flat: #017E5C at 3.83:1.

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
#018662 · 4.58:1
AA on white−28% L
#018662
The quick fox
#016348 · 7.29:1
AAA on white−35% L
#016348
The quick fox
#19fdbf · 15.84:1
AA on blackalready passes
#19fdbf
The quick fox
#19fdbf · 15.84:1
AAA on blackalready passes
#19fdbf

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #01A97C 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
#19fdbf on white: 1.33:1
AA ✗ fail · AA-large · AAA
Aa
#19fdbf on black: 15.84:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #19fdbf as text on that neutral, and that neutral as text on #19fdbf.

NeutralRatioBoth directions
White1.33:1AaAa
Slate 501.27:1AaAa
Slate 1001.21:1AaAa
Slate 2001.08:1AaAa
Slate 3001.12:1AaAa
Slate 4001.93:1AaAa
Slate 5003.59:1AaAa
Slate 6005.72:1AaAa
Slate 7007.81:1AaAa
Slate 80011.04:1AaAa
Slate 90013.47:1AaAa
Black15.84:1AaAa
Colour vision deficiency
true color
protanopia · #F7EABC
deuteranopia · #DED8C3
tritanopia · #00FEEC

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. #19fdbf 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.

#F1FDFA
#E3FCF5
#C1FBEB
#90FEE0
#58FED1
#19fdbf
#02F3B1
#02CA94
#01A276
#067556
#044936
Base = 500Lightest = 50 · #F1FDFADarkest = 950 · #044936Text 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 0.045 166.8);
  --brand-100: oklch(0.94 0.071 166.8);
  --brand-200: oklch(0.88 0.107 166.8);
  --brand-300: oklch(0.80 0.139 166.8);
  --brand-400: oklch(0.72 0.164 166.8);
  --brand-500: oklch(0.64 0.179 166.8);
  --brand-600: oklch(0.56 0.179 166.8);
  --brand-700: oklch(0.48 0.168 166.8);
  --brand-800: oklch(0.40 0.150 166.8);
  --brand-900: oklch(0.32 0.125 166.8);
  --brand-950: oklch(0.24 0.098 166.8);
}

Colors that work with #19fdbf

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#F4FAF9
Tinted page background
Border#C0EDE0
Hairlines and dividers
Muted text#4B9B85
Captions on the surface
Accent#FF1790
Second voice, not a rival
Dark variant#017E5C
Hover, pressed, headers
Light variant#E6FFF8
Selected rows, tints
Dark surface#142420
Dark-mode background
Hover#02F0AF
One step down in lightness
Pressed#02CD96
Two steps down
Disabled#B6D0C9
Chroma pulled out
Focus ring#2BFFC6
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 #19fdbf

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 #017E5C
Safe as a 1px border on white
No — use #01A97C

Meaning and mood

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

cleantechnicalfreshclinical

Cyan reads as water, air and infrastructure: cool, hygienic, engineered.

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

At high lightness it disappears into white surfaces and thin strokes vanish entirely.

Reads as
  • FormalityLow
  • EnergyHigh
  • Weight46/100
  • 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#FD1957
Analogous left#19FD4D
Analogous right#19C9FD
Split-complement 1#FD19C9
Split-complement 2#FD4D19
Triadic 1#BF19FD
Triadic 2#FDBF19
Tetradic#4D19FD
On the wheel
Base+30°−30°+120°+240°+180°164°

#19fdbf sits at 164°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red9.8%
Green99.2%
Blue74.9%
R · 0–255
25
0x19
G · 0–255
253
0xfd
B · 0–255
191
0xbf

CMYK percentages

Cyan90.1%
Magenta0.0%
Yellow24.5%
Key (black)0.8%

Total ink coverage is 115%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#19fdbf text on a black background

contrast 15.84:1

Card sample

#19fdbf text on a white background

contrast 1.33:1

Card sample

#19fdbf on grey

1.21:1

#19fdbf on its own surface

1.26:1

#19fdbf on its dark surface

12.16:1

CSS3 live lab

Text font color

The quick brown fox

color: #19fdbf;
Background color
Panel with #19fdbf background
background-color: #19fdbf;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #19fdbf;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(25, 253, 191, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(25, 253, 191, 0.45);
Border & gradient
Gradient panel
border: 3px solid #19fdbf;
background: linear-gradient(135deg, #19fdbf, #19A3FD);
Gradient text

Gradient headline

background: linear-gradient(90deg, #19fdbf, #196AFD);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #19fdbf;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #19fdbf;
caret-color: #19fdbf;
Left rule
Pull quote or callout
border-left: 4px solid #19fdbf;
Ring + tint
Selected chip
background: #E6FFF8;
box-shadow: inset 0 0 0 2px #19fdbf;
Conic badge
68%
background: conic-gradient(#19fdbf 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #19fdbf 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(25, 253, 191, 0.5)
rgb(25 253 191 / 50%)
#19fdbf80
hsl(164 98% 55% / 50%)
color-mix(in srgb, #19fdbf 50%, transparent)
Alpha8-digit hexFlat on white
10%#19fdbf1a#E8FFF9
20%#19fdbf33#D1FFF2
40%#19fdbf66#A3FEE5
60%#19fdbf99#75FED9
80%#19fdbfcc#47FDCC

Gradients from #19fdbf

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, #56FED0, #19fdbf 45%, #017E5C);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #19fdbf, #0281F5);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #19fdbf, #FD1957);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #74FED8 0%, #19fdbf 45%, #017E5C 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4FAF9, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #4BFD65 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #37C0FD 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #017E5C 0%, transparent 65%), #19fdbf;

Monochromatic scale

Palettes built from #19fdbf

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.

#19fdbf in the real world

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

Industries
TechnologyTravelHealthcareMedia
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 15.84:1.

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.

#19fdbf, answered

What color is #19fdbf?

#19fdbf is a balanced electric cyan, closest to Aqua Marine (ΔE2000 5.7). It sits at 164° on the hue wheel with 98% saturation and 55% lightness, which reads as cool.

What is the RGB value of #19fdbf?

rgb(25, 253, 191) — 25 red, 253 green and 191 blue out of 255, or 9.8% / 99.2% / 74.9% by channel.

What is #19fdbf in HSL and HSV?

hsl(164, 98%, 55%) and hsv(164, 90%, 99%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #19fdbf a light or a dark color?

It is a light color. Relative luminance is 0.7422 and perceived brightness is 80%, so black text on it reaches 15.84:1.

Should I use black or white text on #19fdbf?

Black. It scores 15.84:1 against #19fdbf, versus 1.33:1 for white — AAA at any size.

Is #19fdbf accessible on a white background?

#19fdbf on white scores 1.33:1, which fails WCAG AA at every size. Darken it to #018662 to reach 4.5:1, or #016348 for 7:1.

What is the complementary color of #19fdbf?

#FD1957 sits directly opposite on the wheel. Softer options are the split-complements #FD19C9 and #FD4D19, which give the same contrast with far less vibration.

What colors go well with #19fdbf?

For interface work: #F4FAF9 as the surface, #C0EDE0 for borders, #4B9B85 for secondary text, #FF1790 as an accent and #017E5C for hover and pressed states. For a palette, the analogous pair #19FD4D and #19C9FD stays calm, while #FD1957 is the loudest partner.

What is #19fdbf in CMYK for printing?

cmyk(90%, 0%, 25%, 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 #19fdbf warm or cool?

Cool — it scores 81 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #19FD6B; nudged cooler, #17E9FF.

Which Tailwind color is closest to #19fdbf?

The emerald family — its 500 step is #10b981, ΔE2000 16.1 away. That is a visible difference, so define #19fdbf as a custom token rather than reaching for the built-in.

How do I use #19fdbf in Tailwind CSS?

Inline it as an arbitrary value with bg-[#19fdbf] or text-[#19fdbf], 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 #19fdbf with 50% opacity?

rgba(25, 253, 191, 0.5), or #19fdbf80 in eight-digit hex. Over white that composites to #8CFEDF; over black, #0D7F60.

Is #19fdbf a web-safe color?

No. The nearest web-safe colour is #00FFCC, ΔE2000 2.6 away. The palette only matters for legacy displays and some email clients now.

What does the color #19fdbf mean?

As a cyan, it reads clean, technical, fresh. Cyan reads as water, air and infrastructure: cool, hygienic, engineered. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #19fdbf?

The safest is same-hue elevation: linear-gradient(135deg, #56FED0, #19fdbf 45%, #017E5C). For more colour, a short hue run to #0281F5 keeps it rich without turning muddy.

Work with #19fdbf in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #19fdbf at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.