#31449B
Closest named color: Cobalt (#1E488F). oklch(42.4% 0.143 269.9), rgb(49, 68, 155).
Aa
White text reads best on this color (8.63:1).
About this color
#31449B is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.143 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 8.63:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.43:1 |
| White text | 8.63:1 |
Values
| HEX | #31449B |
| RGB | rgb(49, 68, 155) |
| HSL | hsl(229, 52%, 40%) |
| OKLCH | oklch(42.4% 0.143 269.9) |
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 #31449B | 8.63:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #31449B | 2.43:1 | Fails | Lc 14.7 | Not readable |
| #31449B text on white | 8.63:1 | AAA | Lc 89.3 | Fine for body text |
| #31449B text on black | 2.43:1 | Fails | Lc -12.9 | 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
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ABBFF8
oklch(81% 0.084 269.5)
-
Step 400
400
#809BF4
oklch(70.7% 0.134 269.9)
-
Step 500
500
#627FF0
oklch(63% 0.172 270)
-
Step 600
600
#4B66DE
oklch(55.7% 0.185 269.8)
-
Step 700
700
#3D53C1
oklch(49% 0.173 270.2)
-
Step 800
800 (this color)
#31449B
oklch(42.4% 0.143 269.9)
-
Step 900
900
#2B3B7C
oklch(37.7% 0.112 269.9)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#31449B 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) | #00519E | 0.042 |
| Deuteranopia (no green cones) | #004799 | 0.034 |
| Tritanopia (no blue cones) | #005968 | 0.119 |
| Achromatopsia (no color) | #4C4C4C | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31449B
#31449B
oklch(42.4% 0.143 269.9)
- #604B00
#604B00
oklch(42.3% 0.086 90.2)
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 #31449B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Blueberry #464196 ΔE 0.030
- Dark Slate Blue #483D8B ΔE 0.043
- Sapphire #2138AB ΔE 0.045
- Dusk Blue #26538D ΔE 0.050
- Light Navy #155084 ΔE 0.058
- Twilight #4E518B ΔE 0.065
- Twilight Blue #0A437A ΔE 0.066
Use #31449B 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.