#31558C
Closest named color: Dusk Blue (#26538D). oklch(45% 0.1 258.6), rgb(49, 85, 140).
Aa
White text reads best on this color (7.47:1).
About this color
#31558C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.100 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.013 away. White text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.47:1 |
Values
| HEX | #31558C |
| RGB | rgb(49, 85, 140) |
| HSL | hsl(216, 48%, 37%) |
| OKLCH | oklch(45% 0.1 258.6) |
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 #31558C | 7.47:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #31558C | 2.80:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #31558C text on white | 7.47:1 | AAA | Lc 85.8 | Fine for body text |
| #31558C text on black | 2.80:1 | Fails | Lc -16.3 | 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 800.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#AAC2E7
oklch(80.9% 0.059 259)
-
Step 400
400
#7DA2DB
oklch(70.7% 0.093 258.8)
-
Step 500
500
#5B8AD1
oklch(63.1% 0.119 258.4)
-
Step 600
600
#4172BE
oklch(55.5% 0.13 258.9)
-
Step 700
700
#3360A4
oklch(49.2% 0.12 258.5)
-
Step 800
800 (this color)
#31558C
oklch(45% 0.1 258.6)
-
Step 900
900
#27426A
oklch(37.8% 0.076 258.1)
-
Step 950
950
#17273E
oklch(27.1% 0.048 257.5)
#31558C 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) | #3D598E | 0.019 |
| Deuteranopia (no green cones) | #30518B | 0.012 |
| Tritanopia (no blue cones) | #006269 | 0.084 |
| Achromatopsia (no color) | #555555 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31558C
#31558C
oklch(45% 0.1 258.6)
- #714E00
#714E00
oklch(45.1% 0.094 78.9)
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 #31558C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.013
- Light Navy Blue #2E5A88 ΔE 0.018
- Denim Blue #3B5B92 ΔE 0.023
- Light Navy #155084 ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.036
- Twilight #4E518B ΔE 0.037
- Dusk #4E5481 ΔE 0.040
- Dusky Blue #475F94 ΔE 0.043
Use #31558C 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.