#31498B
Closest named color: Cobalt (#1E488F). oklch(42.2% 0.113 266.6), rgb(49, 73, 139).
Aa
White text reads best on this color (8.54:1).
About this color
#31498B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.113 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.021 away. White text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #31498B |
| RGB | rgb(49, 73, 139) |
| HSL | hsl(224, 48%, 37%) |
| OKLCH | oklch(42.2% 0.113 266.6) |
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 #31498B | 8.54:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #31498B | 2.45:1 | Fails | Lc 14.8 | Not readable |
| #31498B text on white | 8.54:1 | AAA | Lc 89.2 | Fine for body text |
| #31498B text on black | 2.45:1 | Fails | Lc -13.1 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ADC0EC
oklch(80.8% 0.066 266.6)
-
Step 400
400
#829FE3
oklch(70.8% 0.105 266.1)
-
Step 500
500
#6485DB
oklch(63.1% 0.135 266.7)
-
Step 600
600
#4B6DC9
oklch(55.6% 0.148 266.4)
-
Step 700
700
#3D5BAE
oklch(49.2% 0.137 266.5)
-
Step 800
800 (this color)
#31498B
oklch(42.2% 0.113 266.6)
-
Step 900
900
#2C3F70
oklch(37.8% 0.087 266.3)
-
Step 950
950
#1A2542
oklch(27% 0.056 266.9)
#31498B 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) | #29518D | 0.023 |
| Deuteranopia (no green cones) | #19488A | 0.024 |
| Tritanopia (no blue cones) | #005863 | 0.096 |
| Achromatopsia (no color) | #4C4C4C | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31498B
#31498B
oklch(42.2% 0.113 266.6)
- #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 #31498B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Dusk Blue #26538D ΔE 0.029
- Light Navy #155084 ΔE 0.033
- Blueberry #464196 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.046
- Twilight #4E518B ΔE 0.049
- Twilight Blue #0A437A ΔE 0.049
Use #31498B 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.