#31479B
Closest named color: Cobalt (#1E488F). oklch(43% 0.139 268.8), rgb(49, 71, 155).
Aa
White text reads best on this color (8.38:1).
About this color
#31479B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.139 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #31479B |
| RGB | rgb(49, 71, 155) |
| HSL | hsl(228, 52%, 40%) |
| OKLCH | oklch(43% 0.139 268.8) |
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 #31479B | 8.38:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #31479B | 2.50:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #31479B text on white | 8.38:1 | AAA | Lc 88.6 | Fine for body text |
| #31479B text on black | 2.50:1 | Fails | Lc -13.6 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CDD9F8
oklch(88.6% 0.045 268.7)
-
Step 300
300
#ABBFF6
oklch(80.9% 0.081 269)
-
Step 400
400
#7F9CF2
oklch(70.7% 0.13 268.8)
-
Step 500
500
#6081ED
oklch(63.1% 0.166 268.6)
-
Step 600
600
#4967DC
oklch(55.6% 0.182 268.9)
-
Step 700
700
#3B55BF
oklch(49.2% 0.169 268.9)
-
Step 800
800 (this color)
#31479B
oklch(43% 0.139 268.8)
-
Step 900
900
#2A3C7B
oklch(37.7% 0.109 268.7)
-
Step 950
950
#192448
oklch(27.1% 0.068 268.7)
#31479B 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) | #0D539E | 0.037 |
| Deuteranopia (no green cones) | #004999 | 0.033 |
| Tritanopia (no blue cones) | #005B6A | 0.114 |
| Achromatopsia (no color) | #4E4E4E | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31479B
#31479B
oklch(43% 0.139 268.8)
- #634C00
#634C00
oklch(42.9% 0.088 88.6)
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 #31479B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Blueberry #464196 ΔE 0.031
- Dusk Blue #26538D ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.045
- Sapphire #2138AB ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Twilight #4E518B ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.063
Use #31479B 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.