#256C9B
Closest named color: Ocean Blue (#03719C). oklch(51% 0.102 242), rgb(37, 108, 155).
Aa
White text reads best on this color (5.68:1).
About this color
#256C9B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.102 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.017 away. White text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #256C9B |
| RGB | rgb(37, 108, 155) |
| HSL | hsl(204, 61%, 38%) |
| OKLCH | oklch(51% 0.102 242) |
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 #256C9B | 5.68:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #256C9B | 3.69:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #256C9B text on white | 5.68:1 | AA | Lc 78.1 | Fine for body text |
| #256C9B text on black | 3.69:1 | AA large text | Lc -23.7 | 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 700.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A5C5DE
oklch(80.8% 0.049 241.8)
-
Step 400
400
#74A7CE
oklch(70.7% 0.079 242.1)
-
Step 500
500
#4D90C1
oklch(63% 0.101 242.4)
-
Step 600
600
#2D7AAE
oklch(55.7% 0.11 242.3)
-
Step 700
700 (this color)
#256C9B
oklch(51% 0.102 242)
-
Step 800
800
#1C5479
oklch(42.8% 0.084 241.8)
-
Step 900
900
#1E4561
oklch(37.6% 0.065 242.5)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#256C9B 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) | #566D9D | 0.049 |
| Deuteranopia (no green cones) | #46629A | 0.038 |
| Tritanopia (no blue cones) | #00787D | 0.070 |
| Achromatopsia (no color) | #676767 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256C9B
#256C9B
oklch(51% 0.102 242)
- #8F571E
#8F571E
oklch(51% 0.102 61.8)
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 #256C9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.017
- Peacock Blue #016795 ΔE 0.024
- Muted Blue #3B719F ΔE 0.025
- Sea Blue #047495 ΔE 0.029
- Denim #3B638C ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.035
- Mid Blue #276AB3 ΔE 0.040
- French Blue #436BAD ΔE 0.041
Use #256C9B 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.