#255D77
Closest named color: YInMn Blue (#415A77). oklch(45.3% 0.072 231.5), rgb(37, 93, 119).
Aa
White text reads best on this color (7.21:1).
About this color
#255D77 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.072 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.029 away. White text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.91:1 |
| White text | 7.21:1 |
Values
| HEX | #255D77 |
| RGB | rgb(37, 93, 119) |
| HSL | hsl(199, 53%, 31%) |
| OKLCH | oklch(45.3% 0.072 231.5) |
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 #255D77 | 7.21:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #255D77 | 2.91:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #255D77 text on white | 7.21:1 | AAA | Lc 84.8 | Fine for body text |
| #255D77 text on black | 2.91:1 | Fails | Lc -17.2 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#75A9C3
oklch(70.8% 0.067 230.6)
-
Step 500
500
#4E93B4
oklch(63.1% 0.086 231)
-
Step 600
600
#2E7DA0
oklch(55.7% 0.093 231)
-
Step 700
700
#1F6989
oklch(49.1% 0.087 231.3)
-
Step 800
800 (this color)
#255D77
oklch(45.3% 0.072 231.5)
-
Step 900
900
#1E475A
oklch(37.7% 0.056 230.9)
-
Step 950
950
#132A35
oklch(27.2% 0.035 230.7)
#255D77 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) | #505C78 | 0.048 |
| Deuteranopia (no green cones) | #455377 | 0.043 |
| Tritanopia (no blue cones) | #006466 | 0.045 |
| Achromatopsia (no color) | #575757 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255D77
#255D77
oklch(45.3% 0.072 231.5)
- #764A2F
#764A2F
oklch(45.3% 0.072 51.6)
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 #255D77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.029
- Petrol #005F6A ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.043
- Denim #3B638C ΔE 0.044
- Dark Aqua #05696B ΔE 0.049
- Peacock Blue #016795 ΔE 0.051
- Light Navy #155084 ΔE 0.053
Use #255D77 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.