#21544E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.9% 0.055 184.9), rgb(33, 84, 78).
Aa
White text reads best on this color (8.59:1).
About this color
#21544E is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.055 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.021 away. White text reads best on it, at 8.59:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #21544E |
| RGB | rgb(33, 84, 78) |
| HSL | hsl(173, 44%, 23%) |
| OKLCH | oklch(40.9% 0.055 184.9) |
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 #21544E | 8.59:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #21544E | 2.44:1 | Fails | Lc 14.6 | Not readable |
| #21544E text on white | 8.59:1 | AAA | Lc 89.4 | Fine for body text |
| #21544E text on black | 2.44:1 | Fails | Lc -12.9 | 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
#E3ECEA
oklch(93.6% 0.01 181.4)
-
Step 200
200
#CDDDDA
oklch(88.5% 0.018 183.5)
-
Step 300
300
#AAC8C3
oklch(80.9% 0.033 184.4)
-
Step 400
400
#7CACA5
oklch(70.8% 0.052 184.9)
-
Step 500
500
#58978E
oklch(63.1% 0.067 184.1)
-
Step 600
600
#3B8179
oklch(55.6% 0.072 185.4)
-
Step 700
700
#2C6D66
oklch(49.1% 0.067 185.7)
-
Step 800
800 (this color)
#21544E
oklch(40.9% 0.055 184.9)
-
Step 900
900
#244944
oklch(37.6% 0.044 184.3)
-
Step 950
950
#162B28
oklch(27% 0.028 184.2)
#21544E 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) | #504F4E | 0.059 |
| Deuteranopia (no green cones) | #48494F | 0.057 |
| Tritanopia (no blue cones) | #005652 | 0.016 |
| Achromatopsia (no color) | #4C4C4C | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21544E
#21544E
oklch(40.9% 0.055 184.9)
- #643D46
#643D46
oklch(40.9% 0.056 4.8)
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 #21544E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.021
- Dark Blue Green #005249 ΔE 0.022
- Deep Teal #00555A ΔE 0.023
- Dark Teal #014D4E ΔE 0.032
- Dark Green Blue #1F6357 ΔE 0.047
- Petrol #005F6A ΔE 0.049
- Charcoal #264653 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.058
Use #21544E 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.