#255B66
Closest named color: Petrol (#005F6A). oklch(44% 0.059 213.1), rgb(37, 91, 102).
Aa
White text reads best on this color (7.58:1).
About this color
#255B66 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.059 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.019 away. White text reads best on it, at 7.58:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.76:1 |
| White text | 7.58:1 |
Values
| HEX | #255B66 |
| RGB | rgb(37, 91, 102) |
| HSL | hsl(190, 47%, 27%) |
| OKLCH | oklch(44% 0.059 213.1) |
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 #255B66 | 7.58:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #255B66 | 2.76:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #255B66 text on white | 7.58:1 | AAA | Lc 86.2 | Fine for body text |
| #255B66 text on black | 2.76:1 | Fails | Lc -15.9 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CCDDE1
oklch(88.6% 0.019 213.4)
-
Step 300
300
#A8C7CE
oklch(80.9% 0.035 212.9)
-
Step 400
400
#78AAB5
oklch(70.7% 0.055 212.8)
-
Step 500
500
#5395A3
oklch(63.1% 0.07 212.9)
-
Step 600
600
#347F8E
oklch(55.6% 0.077 213)
-
Step 700
700
#256B79
oklch(49.1% 0.072 213.4)
-
Step 800
800 (this color)
#255B66
oklch(44% 0.059 213.1)
-
Step 900
900
#214850
oklch(37.7% 0.046 212.7)
-
Step 950
950
#142A2F
oklch(26.9% 0.029 214)
#255B66 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) | #535867 | 0.055 |
| Deuteranopia (no green cones) | #495166 | 0.049 |
| Tritanopia (no blue cones) | #005F5E | 0.028 |
| Achromatopsia (no color) | #545454 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B66
#255B66
oklch(44% 0.059 213.1)
- #6F463D
#6F463D
oklch(43.9% 0.059 33)
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 #255B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.019
- Deep Teal #00555A ΔE 0.035
- Dark Green Blue #1F6357 ΔE 0.042
- Dark Aqua #05696B ΔE 0.043
- YInMn Blue #415A77 ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.045
- Dark Blue Green #005249 ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.060
Use #255B66 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.