#2556A3
Closest named color: Dusk Blue (#26538D). oklch(46.3% 0.135 259.3), rgb(37, 86, 163).
Aa
White text reads best on this color (7.14:1).
About this color
#2556A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.135 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.036 away. White text reads best on it, at 7.14:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.93:1 |
| White text | 7.14:1 |
Values
| HEX | #2556A3 |
| RGB | rgb(37, 86, 163) |
| HSL | hsl(217, 63%, 39%) |
| OKLCH | oklch(46.3% 0.135 259.3) |
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 #2556A3 | 7.14:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #2556A3 | 2.93:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #2556A3 text on white | 7.14:1 | AAA | Lc 84.4 | Fine for body text |
| #2556A3 text on black | 2.93:1 | Fails | Lc -17.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EC
oklch(80.9% 0.066 259.9)
-
Step 400
400
#79A2E2
oklch(70.8% 0.105 259.1)
-
Step 500
500
#5689DA
oklch(63.1% 0.134 259.3)
-
Step 600
600
#3B71C7
oklch(55.6% 0.146 259.4)
-
Step 700
700 (this color)
#2556A3
oklch(46.3% 0.135 259.3)
-
Step 800
800
#264D8B
oklch(42.6% 0.112 259.3)
-
Step 900
900
#24416F
oklch(37.7% 0.087 259.3)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#2556A3 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) | #2D5EA6 | 0.025 |
| Deuteranopia (no green cones) | #0B52A1 | 0.021 |
| Tritanopia (no blue cones) | #006874 | 0.105 |
| Achromatopsia (no color) | #585858 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2556A3
#2556A3
oklch(46.3% 0.135 259.3)
- #755100
#755100
oklch(46.2% 0.096 79)
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 #2556A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Dusky Blue #475F94 ΔE 0.054
- Light Navy #155084 ΔE 0.055
- Twilight #4E518B ΔE 0.058
- Peacock Blue #016795 ΔE 0.058
Use #2556A3 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.