#21524E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.4% 0.053 188.1), rgb(33, 82, 78).
Aa
White text reads best on this color (8.81:1).
About this color
#21524E is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.053 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.017 away. White text reads best on it, at 8.81:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #21524E |
| RGB | rgb(33, 82, 78) |
| HSL | hsl(175, 43%, 23%) |
| OKLCH | oklch(40.4% 0.053 188.1) |
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 #21524E | 8.81:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #21524E | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #21524E text on white | 8.81:1 | AAA | Lc 90.0 | Fine for body text |
| #21524E text on black | 2.38:1 | Fails | Lc -12.3 | Not readable |
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 800.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E4ECEB
oklch(93.7% 0.009 188.1)
-
Step 200
200
#CDDDDB
oklch(88.5% 0.017 187.8)
-
Step 300
300
#ABC7C4
oklch(80.8% 0.03 188.7)
-
Step 400
400
#7DABA6
oklch(70.7% 0.05 187.7)
-
Step 500
500
#5A9691
oklch(63.1% 0.063 188.9)
-
Step 600
600
#3D807B
oklch(55.5% 0.069 188.9)
-
Step 700
700
#2F6D67
oklch(49.2% 0.065 186.8)
-
Step 800
800 (this color)
#21524E
oklch(40.4% 0.053 188.1)
-
Step 900
900
#254946
oklch(37.7% 0.042 188.6)
-
Step 950
950
#172B29
oklch(27.1% 0.026 187.7)
#21524E 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) | #4E4E4E | 0.057 |
| Deuteranopia (no green cones) | #46484F | 0.054 |
| Tritanopia (no blue cones) | #005451 | 0.016 |
| Achromatopsia (no color) | #4A4A4A | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21524E
#21524E
oklch(40.4% 0.053 188.1)
- #623C43
#623C43
oklch(40.3% 0.054 7.8)
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 #21524E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.017
- Dark Blue Green #005249 ΔE 0.021
- Deep Teal #00555A ΔE 0.022
- Dark Teal #014D4E ΔE 0.027
- Charcoal #264653 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.052
- Petrol #005F6A ΔE 0.052
- Dark Green Blue #1F6357 ΔE 0.054
Use #21524E 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.