#255B4B
Closest named color: Dark Green Blue (#1F6357). oklch(43% 0.064 171.1), rgb(37, 91, 75).
Aa
White text reads best on this color (7.84:1).
About this color
#255B4B is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.064 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.027 away. White text reads best on it, at 7.84:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.67:1 |
| White text | 7.84:1 |
Values
| HEX | #255B4B |
| RGB | rgb(37, 91, 75) |
| HSL | hsl(162, 42%, 25%) |
| OKLCH | oklch(43% 0.064 171.1) |
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 #255B4B | 7.84:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #255B4B | 2.67:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #255B4B text on white | 7.84:1 | AAA | Lc 87.0 | Fine for body text |
| #255B4B text on black | 2.67:1 | Fails | Lc -15.1 | Dividers and decoration only |
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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E3ECE9
oklch(93.5% 0.01 174.3)
-
Step 200
200
#CCDED7
oklch(88.5% 0.021 170.6)
-
Step 300
300
#AAC9BD
oklch(81% 0.037 170)
-
Step 400
400
#7BAD9C
oklch(70.7% 0.059 171.5)
-
Step 500
500
#569983
oklch(63.2% 0.077 170.5)
-
Step 600
600
#38836D
oklch(55.6% 0.083 171.2)
-
Step 700
700
#2A6F5B
oklch(49.2% 0.077 170.9)
-
Step 800
800 (this color)
#255B4B
oklch(43% 0.064 171.1)
-
Step 900
900
#234A3E
oklch(37.6% 0.049 171.3)
-
Step 950
950
#152B24
oklch(26.8% 0.031 171.4)
#255B4B 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) | #58554A | 0.065 |
| Deuteranopia (no green cones) | #504F4C | 0.063 |
| Tritanopia (no blue cones) | #095C56 | 0.021 |
| Achromatopsia (no color) | #525252 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B4B
#255B4B
oklch(43% 0.064 171.1)
- #6A4154
#6A4154
oklch(43% 0.063 350.8)
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 #255B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.027
- Pine #2B5D34 ΔE 0.037
- Dark Blue Green #005249 ΔE 0.039
- Spruce #0A5F38 ΔE 0.041
- Deep Teal #00555A ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.043
- Petrol #005F6A ΔE 0.049
- Dark Aqua #05696B ΔE 0.056
Use #255B4B 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.