#255156
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.6% 0.049 205.2), rgb(37, 81, 86).
Aa
White text reads best on this color (8.78:1).
About this color
#255156 is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.049 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.014 away. White text reads best on it, at 8.78:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.39:1 |
| White text | 8.78:1 |
Values
| HEX | #255156 |
| RGB | rgb(37, 81, 86) |
| HSL | hsl(186, 40%, 24%) |
| OKLCH | oklch(40.6% 0.049 205.2) |
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 #255156 | 8.78:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #255156 | 2.39:1 | Fails | Lc 14.0 | Not readable |
| #255156 text on white | 8.78:1 | AAA | Lc 89.9 | Fine for body text |
| #255156 text on black | 2.39:1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEC
oklch(93.5% 0.008 207.1)
-
Step 200
200
#CEDCDE
oklch(88.4% 0.015 207.1)
-
Step 300
300
#ACC6C9
oklch(80.8% 0.028 205.1)
-
Step 400
400
#7FA9AE
oklch(70.6% 0.046 205.3)
-
Step 500
500
#5D949A
oklch(63.1% 0.059 204.6)
-
Step 600
600
#417E85
oklch(55.5% 0.064 205.2)
-
Step 700
700
#336A71
oklch(49% 0.059 206.4)
-
Step 800
800 (this color)
#255156
oklch(40.6% 0.049 205.2)
-
Step 900
900
#28484B
oklch(37.8% 0.038 203.4)
-
Step 950
950
#182A2C
oklch(27% 0.024 204.7)
#255156 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) | #4B4E56 | 0.048 |
| Deuteranopia (no green cones) | #434856 | 0.045 |
| Tritanopia (no blue cones) | #015452 | 0.024 |
| Achromatopsia (no color) | #4B4B4B | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255156
#255156
oklch(40.6% 0.049 205.2)
- #613F3C
#613F3C
oklch(40.6% 0.048 25)
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 #255156, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.014
- Deep Teal #00555A ΔE 0.021
- Dark Teal #014D4E ΔE 0.031
- Dark Blue Green #005249 ΔE 0.034
- Charcoal #264653 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.040
- Petrol #005F6A ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.055
Use #255156 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.