#21877E
Closest named color: Dark Cyan (#008B8B). oklch(56.5% 0.09 186.1), rgb(33, 135, 126).
Aa
Black text reads best on this color (4.83:1).
About this color
#21877E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.090 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.020 away. Black text reads best on it, at 4.83:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 4.83:1 |
| White text | 4.34:1 |
Values
| HEX | #21877E |
| RGB | rgb(33, 135, 126) |
| HSL | hsl(175, 61%, 33%) |
| OKLCH | oklch(56.5% 0.09 186.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #21877E | 4.34:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #21877E | 4.83:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #21877E text on white | 4.34:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #21877E text on black | 4.83:1 | AA | Lc -31.9 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2EDEB
oklch(93.7% 0.012 184.1)
-
Step 200
200
#C9DEDB
oklch(88.4% 0.023 186.4)
-
Step 300
300
#A4CAC4
oklch(81% 0.041 184.7)
-
Step 400
400
#70AEA7
oklch(70.7% 0.065 186.8)
-
Step 500
500
#459A91
oklch(63.1% 0.083 186)
-
Step 600
600 (this color)
#21877E
oklch(56.5% 0.09 186.1)
-
Step 700
700
#097068
oklch(49.2% 0.084 186.1)
-
Step 800
800
#105B55
oklch(42.7% 0.069 186.7)
-
Step 900
900
#184B46
oklch(37.7% 0.054 186.1)
-
Step 950
950
#102C29
oklch(27% 0.034 186.1)
#21877E with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #807F7E | 0.097 |
| Deuteranopia (no green cones) | #71757F | 0.090 |
| Tritanopia (no blue cones) | #008A84 | 0.012 |
| Achromatopsia (no color) | #797979 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21877E
#21877E
oklch(56.5% 0.09 186.1)
- #A35F6E
#A35F6E
oklch(56.6% 0.09 6.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #21877E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.020
- Teal #008080 ΔE 0.026
- Bluegreen #017A79 ΔE 0.043
- Teal Green #0A9396 ΔE 0.043
- Dusty Teal #4C9085 ΔE 0.044
- Deep Aqua #08787F ΔE 0.050
- Teal Blue #01889F ΔE 0.051
- Viridian #1E9167 ΔE 0.054
Use #21877E in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.