#3151AC
Closest named color: Dusk Blue (#26538D). oklch(46.4% 0.151 266.1), rgb(49, 81, 172).
Aa
White text reads best on this color (7.23:1).
About this color
#3151AC is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.151 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.053 away. White text reads best on it, at 7.23:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.90:1 |
| White text | 7.23:1 |
Values
| HEX | #3151AC |
| RGB | rgb(49, 81, 172) |
| HSL | hsl(224, 56%, 43%) |
| OKLCH | oklch(46.4% 0.151 266.1) |
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 #3151AC | 7.23:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #3151AC | 2.90:1 | Fails | Lc 19.3 | Dividers and decoration only |
| #3151AC text on white | 7.23:1 | AAA | Lc 84.7 | Fine for body text |
| #3151AC text on black | 2.90:1 | Fails | Lc -17.3 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F1
oklch(80.9% 0.073 266.7)
-
Step 400
400
#7E9EEA
oklch(70.7% 0.118 266.1)
-
Step 500
500
#5F84E3
oklch(63.1% 0.149 266.2)
-
Step 600
600
#466CD1
oklch(55.7% 0.162 265.9)
-
Step 700
700 (this color)
#3151AC
oklch(46.4% 0.151 266.1)
-
Step 800
800
#2E4992
oklch(42.6% 0.125 266)
-
Step 900
900
#293E75
oklch(37.7% 0.098 266.1)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#3151AC 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) | #145DAF | 0.034 |
| Deuteranopia (no green cones) | #0052AA | 0.029 |
| Tritanopia (no blue cones) | #006776 | 0.122 |
| Achromatopsia (no color) | #575757 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3151AC
#3151AC
oklch(46.4% 0.151 266.1)
- #715400
#715400
oklch(46.4% 0.095 85.4)
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 #3151AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.053
- Blueberry #464196 ΔE 0.055
- Denim Blue #3B5B92 ΔE 0.055
- Cobalt #1E488F ΔE 0.057
- Blue Blue #2242C7 ΔE 0.059
- Twilight #4E518B ΔE 0.064
- Dusky Blue #475F94 ΔE 0.066
- Sapphire #2138AB ΔE 0.066
Use #3151AC 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.