#31457C
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.096 267), rgb(49, 69, 124).
Aa
White text reads best on this color (9.23:1).
About this color
#31457C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.096 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.035 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #31457C |
| RGB | rgb(49, 69, 124) |
| HSL | hsl(224, 43%, 34%) |
| OKLCH | oklch(40.3% 0.096 267) |
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 #31457C | 9.23:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #31457C | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #31457C text on white | 9.23:1 | AAA | Lc 91.1 | Preferred for body text |
| #31457C text on black | 2.27:1 | Fails | Lc -11.2 | Not readable |
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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B0C0E6
oklch(80.8% 0.057 267.2)
-
Step 400
400
#879FD9
oklch(70.6% 0.09 266.8)
-
Step 500
500
#6A86CF
oklch(63% 0.115 267.2)
-
Step 600
600
#526FBC
oklch(55.6% 0.125 266.8)
-
Step 700
700
#435CA2
oklch(49% 0.116 267.3)
-
Step 800
800 (this color)
#31457C
oklch(40.3% 0.096 267)
-
Step 900
900
#304069
oklch(37.8% 0.073 266.8)
-
Step 950
950
#1C253E
oklch(26.9% 0.049 268)
#31457C 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) | #2D4B7E | 0.017 |
| Deuteranopia (no green cones) | #23447B | 0.017 |
| Tritanopia (no blue cones) | #00515A | 0.085 |
| Achromatopsia (no color) | #474747 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31457C
#31457C
oklch(40.3% 0.096 267)
- #5C4500
#5C4500
oklch(40.4% 0.083 86.9)
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 #31457C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.035
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.037
- Dusk Blue #26538D ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.049
- Blueberry #464196 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.059
Use #31457C 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.