#255B74
Closest named color: Petrol (#005F6A). oklch(44.6% 0.07 231.3), rgb(37, 91, 116).
Aa
White text reads best on this color (7.42:1).
About this color
#255B74 is a dark, muted blue. In OKLCH its lightness is 45%, its chroma 0.070 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.030 away. White text reads best on it, at 7.42:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.82:1 |
| White text | 7.42:1 |
Values
| HEX | #255B74 |
| RGB | rgb(37, 91, 116) |
| HSL | hsl(199, 52%, 30%) |
| OKLCH | oklch(44.6% 0.07 231.3) |
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 #255B74 | 7.42:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #255B74 | 2.82:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #255B74 text on white | 7.42:1 | AAA | Lc 85.6 | Fine for body text |
| #255B74 text on black | 2.82:1 | Fails | Lc -16.4 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A7C6D7
oklch(80.9% 0.041 231.9)
-
Step 400
400
#76A8C2
oklch(70.6% 0.065 231.5)
-
Step 500
500
#5093B3
oklch(63.2% 0.083 230.8)
-
Step 600
600
#317C9F
oklch(55.5% 0.091 232)
-
Step 700
700
#226988
oklch(49.2% 0.084 231.1)
-
Step 800
800 (this color)
#255B74
oklch(44.6% 0.07 231.3)
-
Step 900
900
#204759
oklch(37.8% 0.054 230.4)
-
Step 950
950
#142934
oklch(26.9% 0.034 232.8)
#255B74 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) | #4E5A75 | 0.047 |
| Deuteranopia (no green cones) | #445274 | 0.041 |
| Tritanopia (no blue cones) | #006263 | 0.045 |
| Achromatopsia (no color) | #555555 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B74
#255B74
oklch(44.6% 0.07 231.3)
- #73492F
#73492F
oklch(44.7% 0.069 51.9)
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 #255B74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.030
- YInMn Blue #415A77 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.041
- Denim #3B638C ΔE 0.050
- Light Navy #155084 ΔE 0.050
- Deep Teal #00555A ΔE 0.052
- Dark Aqua #05696B ΔE 0.052
Use #255B74 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.