#31437F
Closest named color: Cobalt (#1E488F). oklch(40% 0.103 268.8), rgb(49, 67, 127).
Aa
White text reads best on this color (9.37:1).
About this color
#31437F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.103 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.23:1 |
| White text | 9.37:1 |
Values
| HEX | #31437F |
| RGB | rgb(49, 67, 127) |
| HSL | hsl(226, 44%, 35%) |
| OKLCH | oklch(40% 0.103 268.8) |
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 #31437F | 9.37:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #31437F | 2.23:1 | Fails | Lc 12.5 | Not readable |
| #31437F text on white | 9.37:1 | AAA | Lc 91.5 | Preferred for body text |
| #31437F text on black | 2.23:1 | Fails | Lc -10.9 | 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 900.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F7
oklch(88.6% 0.043 268.2)
-
Step 300
300
#ACBFF4
oklch(80.9% 0.078 269.3)
-
Step 400
400
#819CEE
oklch(70.6% 0.124 269.2)
-
Step 500
500
#6282E8
oklch(63.1% 0.157 268.5)
-
Step 600
600
#4B68D7
oklch(55.5% 0.173 269.1)
-
Step 700
700
#3C56BA
oklch(49% 0.16 268.8)
-
Step 800
800
#324797
oklch(42.7% 0.133 269)
-
Step 900
900 (this color)
#31437F
oklch(40% 0.103 268.8)
-
Step 950
950
#192446
oklch(27% 0.065 268.3)
#31437F 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) | #274A81 | 0.021 |
| Deuteranopia (no green cones) | #1B437E | 0.024 |
| Tritanopia (no blue cones) | #00505B | 0.089 |
| Achromatopsia (no color) | #464646 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31437F
#31437F
oklch(40% 0.103 268.8)
- #5A4500
#5A4500
oklch(40.2% 0.082 88.8)
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 #31437F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.043
- Dusk Blue #26538D ΔE 0.048
- Blueberry #464196 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.054
- Twilight #4E518B ΔE 0.063
Use #31437F 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.