#255159
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.7% 0.05 210.9), rgb(37, 81, 89).
Aa
White text reads best on this color (8.75:1).
About this color
#255159 is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.050 and its hue 211°. 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 8.75:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.39:1 |
| White text | 8.75:1 |
Values
| HEX | #255159 |
| RGB | rgb(37, 81, 89) |
| HSL | hsl(189, 41%, 25%) |
| OKLCH | oklch(40.7% 0.05 210.9) |
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 #255159 | 8.75:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #255159 | 2.39:1 | Fails | Lc 14.1 | Not readable |
| #255159 text on white | 8.75:1 | AAA | Lc 89.8 | Fine for body text |
| #255159 text on black | 2.39:1 | Fails | Lc -12.4 | 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
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCDF
oklch(88.5% 0.016 212)
-
Step 300
300
#ACC6CB
oklch(80.9% 0.029 210.5)
-
Step 400
400
#7FA9B1
oklch(70.7% 0.047 210.6)
-
Step 500
500
#5D949E
oklch(63.2% 0.06 210.3)
-
Step 600
600
#417E89
oklch(55.7% 0.065 210.6)
-
Step 700
700
#326A74
oklch(49.1% 0.061 210.7)
-
Step 800
800 (this color)
#255159
oklch(40.7% 0.05 210.9)
-
Step 900
900
#27474D
oklch(37.6% 0.039 210.9)
-
Step 950
950
#182A2D
oklch(27.1% 0.024 209.1)
#255159 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) | #4A4E59 | 0.047 |
| Deuteranopia (no green cones) | #424859 | 0.043 |
| Tritanopia (no blue cones) | #005553 | 0.028 |
| Achromatopsia (no color) | #4B4B4B | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255159
#255159
oklch(40.7% 0.05 210.9)
- #623F39
#623F39
oklch(40.6% 0.051 30.1)
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 #255159, 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
- Deep Teal #00555A ΔE 0.022
- Dark Teal #014D4E ΔE 0.033
- Charcoal #264653 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.037
- Dark Blue Green #005249 ΔE 0.038
- Petrol #005F6A ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.056
Use #255159 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.