#255B5B
Closest named color: Petrol (#005F6A). oklch(43.5% 0.057 195.3), rgb(37, 91, 91).
Aa
White text reads best on this color (7.70:1).
About this color
#255B5B is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.057 and its hue 195°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.026 away. White text reads best on it, at 7.70:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.72:1 |
| White text | 7.70:1 |
Values
| HEX | #255B5B |
| RGB | rgb(37, 91, 91) |
| HSL | hsl(180, 42%, 25%) |
| OKLCH | oklch(43.5% 0.057 195.3) |
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 #255B5B | 7.70:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #255B5B | 2.72:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #255B5B text on white | 7.70:1 | AAA | Lc 86.6 | Fine for body text |
| #255B5B text on black | 2.72:1 | Fails | Lc -15.5 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CCDDDD
oklch(88.5% 0.018 196.8)
-
Step 300
300
#A9C8C7
oklch(81% 0.033 194.1)
-
Step 400
400
#79ABAB
oklch(70.6% 0.053 196)
-
Step 500
500
#549796
oklch(63.2% 0.068 194.3)
-
Step 600
600
#368181
oklch(55.7% 0.074 195.2)
-
Step 700
700
#276D6D
oklch(49.2% 0.069 195.1)
-
Step 800
800 (this color)
#255B5B
oklch(43.5% 0.057 195.3)
-
Step 900
900
#224949
oklch(37.7% 0.044 195.4)
-
Step 950
950
#152B2B
oklch(27.1% 0.028 195.6)
#255B5B 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) | #55575B | 0.059 |
| Deuteranopia (no green cones) | #4C505B | 0.055 |
| Tritanopia (no blue cones) | #005E5B | 0.019 |
| Achromatopsia (no color) | #535353 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B5B
#255B5B
oklch(43.5% 0.057 195.3)
- #6D4447
#6D4447
oklch(43.5% 0.057 14.9)
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 #255B5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.026
- Dark Green Blue #1F6357 ΔE 0.029
- Deep Teal #00555A ΔE 0.030
- Dark Slate Gray #2F4F4F ΔE 0.038
- Dark Aqua #05696B ΔE 0.044
- Dark Blue Green #005249 ΔE 0.046
- Dark Teal #014D4E ΔE 0.055
- YInMn Blue #415A77 ΔE 0.060
Use #255B5B 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.