#31556D
Closest named color: YInMn Blue (#415A77). oklch(43.3% 0.058 239.2), rgb(49, 85, 109).
Aa
White text reads best on this color (7.92:1).
About this color
#31556D is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.058 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.030 away. White text reads best on it, at 7.92:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.65:1 |
| White text | 7.92:1 |
Values
| HEX | #31556D |
| RGB | rgb(49, 85, 109) |
| HSL | hsl(204, 38%, 31%) |
| OKLCH | oklch(43.3% 0.058 239.2) |
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 #31556D | 7.92:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #31556D | 2.65:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #31556D text on white | 7.92:1 | AAA | Lc 87.4 | Fine for body text |
| #31556D text on black | 2.65:1 | Fails | Lc -14.8 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#AEC4D4
oklch(80.9% 0.033 239.5)
-
Step 400
400
#82A6BF
oklch(70.7% 0.054 238.8)
-
Step 500
500
#6290AF
oklch(63.2% 0.068 238.8)
-
Step 600
600
#47799B
oklch(55.5% 0.076 239.8)
-
Step 700
700
#396684
oklch(49.1% 0.069 239.5)
-
Step 800
800 (this color)
#31556D
oklch(43.3% 0.058 239.2)
-
Step 900
900
#2A4557
oklch(37.7% 0.045 238.8)
-
Step 950
950
#192833
oklch(26.9% 0.029 241)
#31556D 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) | #4A556E | 0.032 |
| Deuteranopia (no green cones) | #424E6D | 0.028 |
| Tritanopia (no blue cones) | #0E5B5D | 0.046 |
| Achromatopsia (no color) | #515151 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31556D
#31556D
oklch(43.3% 0.058 239.2)
- #684930
#684930
oklch(43.3% 0.057 59.4)
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 #31556D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.030
- Petrol #005F6A ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.045
- Deep Teal #00555A ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.050
- Light Navy #155084 ΔE 0.050
- Dusty Grape #545775 ΔE 0.050
Use #31556D 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.