#31488E
Closest named color: Cobalt (#1E488F). oklch(42.2% 0.119 267.5), rgb(49, 72, 142).
Aa
White text reads best on this color (8.57:1).
About this color
#31488E is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.119 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.019 away. White text reads best on it, at 8.57:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.44:1 |
| White text | 8.57:1 |
Values
| HEX | #31488E |
| RGB | rgb(49, 72, 142) |
| HSL | hsl(225, 49%, 37%) |
| OKLCH | oklch(42.2% 0.119 267.5) |
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 #31488E | 8.57:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #31488E | 2.44:1 | Fails | Lc 14.8 | Not readable |
| #31488E text on white | 8.57:1 | AAA | Lc 89.2 | Fine for body text |
| #31488E text on black | 2.44:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F4
oklch(88.5% 0.039 267.9)
-
Step 300
300
#ADC0EF
oklch(81% 0.07 267.6)
-
Step 400
400
#829EE6
oklch(70.7% 0.111 267.3)
-
Step 500
500
#6384DF
oklch(63.1% 0.142 267.3)
-
Step 600
600
#4B6CCD
oklch(55.7% 0.154 267.2)
-
Step 700
700
#3D59B1
oklch(49% 0.144 267.6)
-
Step 800
800 (this color)
#31488E
oklch(42.2% 0.119 267.5)
-
Step 900
900
#2C3E73
oklch(37.7% 0.093 267.7)
-
Step 950
950
#1A2543
oklch(27.1% 0.058 267.3)
#31488E 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) | #245191 | 0.026 |
| Deuteranopia (no green cones) | #10488D | 0.028 |
| Tritanopia (no blue cones) | #005864 | 0.100 |
| Achromatopsia (no color) | #4C4C4C | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31488E
#31488E
oklch(42.2% 0.119 267.5)
- #624A00
#624A00
oklch(42.3% 0.086 87.2)
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 #31488E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.019
- Dusk Blue #26538D ΔE 0.032
- Blueberry #464196 ΔE 0.036
- Light Navy #155084 ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.051
- Twilight #4E518B ΔE 0.051
- Twilight Blue #0A437A ΔE 0.052
Use #31488E 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.