#31375E
Closest named color: Prussian Blue (#1D3557). oklch(35.1% 0.068 275.7), rgb(49, 55, 94).
Aa
White text reads best on this color (11.42:1).
About this color
#31375E is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.068 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.032 away. White text reads best on it, at 11.42:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.83:1 |
| White text | 11.42:1 |
Values
| HEX | #31375E |
| RGB | rgb(49, 55, 94) |
| HSL | hsl(232, 31%, 28%) |
| OKLCH | oklch(35.1% 0.068 275.7) |
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 #31375E | 11.42:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #31375E | 1.83:1 | Fails | Lc 7.6 | Not readable |
| #31375E text on white | 11.42:1 | AAA | Lc 96.3 | Preferred for body text |
| #31375E text on black | 1.83:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B7BFE2
oklch(81% 0.05 275.1)
-
Step 400
400
#929DD4
oklch(70.8% 0.082 275.4)
-
Step 500
500
#7884C8
oklch(63.2% 0.103 275.4)
-
Step 600
600
#616CB5
oklch(55.5% 0.114 275.6)
-
Step 700
700
#515A9C
oklch(49.1% 0.106 275.9)
-
Step 800
800
#424A7E
oklch(42.7% 0.087 275.5)
-
Step 900
900 (this color)
#31375E
oklch(35.1% 0.068 275.7)
-
Step 950
950
#21243B
oklch(26.9% 0.043 277.4)
#31375E 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) | #293C60 | 0.017 |
| Deuteranopia (no green cones) | #25385D | 0.017 |
| Tritanopia (no blue cones) | #223F46 | 0.060 |
| Achromatopsia (no color) | #3A3A3A | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31375E
#31375E
oklch(35.1% 0.068 275.7)
- #463A06
#463A06
oklch(35.1% 0.068 95)
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 #31375E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.044
- Marine Blue #01386A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.049
- Gunmetal #293241 ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.055
- Onyx #343A40 ΔE 0.057
- Charcoal #264653 ΔE 0.057
Use #31375E 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.