#255E63
Closest named color: Petrol (#005F6A). oklch(44.7% 0.059 203.2), rgb(37, 94, 99).
Aa
White text reads best on this color (7.34:1).
About this color
#255E63 is a dark, muted teal or cyan. In OKLCH its lightness is 45%, its chroma 0.059 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.018 away. White text reads best on it, at 7.34:1.
| Hue family | Teals and cyans |
| Lightness | dark (45%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.85:1 |
| White text | 7.34:1 |
Values
| HEX | #255E63 |
| RGB | rgb(37, 94, 99) |
| HSL | hsl(185, 46%, 27%) |
| OKLCH | oklch(44.7% 0.059 203.2) |
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 #255E63 | 7.34:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #255E63 | 2.85:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #255E63 text on white | 7.34:1 | AAA | Lc 85.3 | Fine for body text |
| #255E63 text on black | 2.85:1 | Fails | Lc -16.7 | 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
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CBDDDF
oklch(88.5% 0.019 204.8)
-
Step 300
300
#A7C8CB
oklch(81% 0.036 203.2)
-
Step 400
400
#77ABB0
oklch(70.7% 0.055 203.5)
-
Step 500
500
#51969D
oklch(63.1% 0.07 204.1)
-
Step 600
600
#318087
oklch(55.5% 0.076 203.4)
-
Step 700
700
#226D73
oklch(49.2% 0.072 202.8)
-
Step 800
800 (this color)
#255E63
oklch(44.7% 0.059 203.2)
-
Step 900
900
#20494D
oklch(37.8% 0.046 203.9)
-
Step 950
950
#142B2D
oklch(27.1% 0.029 202.9)
#255E63 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) | #575A63 | 0.059 |
| Deuteranopia (no green cones) | #4D5363 | 0.054 |
| Tritanopia (no blue cones) | #00625F | 0.023 |
| Achromatopsia (no color) | #565656 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255E63
#255E63
oklch(44.7% 0.059 203.2)
- #724745
#724745
oklch(44.7% 0.06 22.6)
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 #255E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.018
- Dark Green Blue #1F6357 ΔE 0.030
- Dark Aqua #05696B ΔE 0.034
- Deep Teal #00555A ΔE 0.039
- Dark Slate Gray #2F4F4F ΔE 0.049
- YInMn Blue #415A77 ΔE 0.050
- Dark Blue Green #005249 ΔE 0.059
- Slate #516572 ΔE 0.061
Use #255E63 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.