#255B4E
Closest named color: Dark Green Blue (#1F6357). oklch(43.1% 0.062 175.1), rgb(37, 91, 78).
Aa
White text reads best on this color (7.82:1).
About this color
#255B4E is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.062 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.025 away. White text reads best on it, at 7.82:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #255B4E |
| RGB | rgb(37, 91, 78) |
| HSL | hsl(166, 42%, 25%) |
| OKLCH | oklch(43.1% 0.062 175.1) |
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 #255B4E | 7.82:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #255B4E | 2.68:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #255B4E text on white | 7.82:1 | AAA | Lc 87.0 | Fine for body text |
| #255B4E text on black | 2.68:1 | 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
#F2F6F5
oklch(97% 0.004 179.7)
-
Step 100
100
#E3ECE9
oklch(93.5% 0.01 174.3)
-
Step 200
200
#CCDED8
oklch(88.5% 0.021 173.9)
-
Step 300
300
#A9C9BF
oklch(80.9% 0.037 174.5)
-
Step 400
400
#7AAD9E
oklch(70.7% 0.058 174.3)
-
Step 500
500
#569887
oklch(63.1% 0.073 175.3)
-
Step 600
600
#388371
oklch(55.7% 0.08 175.1)
-
Step 700
700
#296E5E
oklch(49% 0.074 175.1)
-
Step 800
800 (this color)
#255B4E
oklch(43.1% 0.062 175.1)
-
Step 900
900
#234A40
oklch(37.7% 0.048 174.9)
-
Step 950
950
#152B26
oklch(26.9% 0.03 177.6)
#255B4E 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) | #58554D | 0.065 |
| Deuteranopia (no green cones) | #504F4F | 0.063 |
| Tritanopia (no blue cones) | #055C57 | 0.019 |
| Achromatopsia (no color) | #525252 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B4E
#255B4E
oklch(43.1% 0.062 175.1)
- #6B4152
#6B4152
oklch(43% 0.063 354.2)
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 #255B4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.025
- Deep Teal #00555A ΔE 0.038
- Dark Blue Green #005249 ΔE 0.039
- Dark Slate Gray #2F4F4F ΔE 0.040
- Pine #2B5D34 ΔE 0.042
- Petrol #005F6A ΔE 0.044
- Spruce #0A5F38 ΔE 0.045
- Dark Aqua #05696B ΔE 0.053
Use #255B4E 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.