#31488B
Closest named color: Cobalt (#1E488F). oklch(42% 0.115 267.1), rgb(49, 72, 139).
Aa
White text reads best on this color (8.64:1).
About this color
#31488B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.115 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.020 away. White text reads best on it, at 8.64:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.43:1 |
| White text | 8.64:1 |
Values
| HEX | #31488B |
| RGB | rgb(49, 72, 139) |
| HSL | hsl(225, 48%, 37%) |
| OKLCH | oklch(42% 0.115 267.1) |
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 #31488B | 8.64:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #31488B | 2.43:1 | Fails | Lc 14.6 | Not readable |
| #31488B text on white | 8.64:1 | AAA | Lc 89.4 | Fine for body text |
| #31488B text on black | 2.43:1 | Fails | Lc -12.8 | 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
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ADC0ED
oklch(80.9% 0.067 267)
-
Step 400
400
#839EE4
oklch(70.7% 0.107 267.5)
-
Step 500
500
#6485DC
oklch(63.2% 0.137 266.8)
-
Step 600
600
#4C6CCA
oklch(55.5% 0.15 267.3)
-
Step 700
700
#3D5AAE
oklch(49% 0.138 266.9)
-
Step 800
800 (this color)
#31488B
oklch(42% 0.115 267.1)
-
Step 900
900
#2C3E71
oklch(37.6% 0.09 267.3)
-
Step 950
950
#1A2542
oklch(27% 0.056 266.9)
#31488B 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) | #27508D | 0.023 |
| Deuteranopia (no green cones) | #16488A | 0.025 |
| Tritanopia (no blue cones) | #005762 | 0.097 |
| Achromatopsia (no color) | #4C4C4C | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31488B
#31488B
oklch(42% 0.115 267.1)
- #614900
#614900
oklch(41.9% 0.086 87)
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 #31488B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.020
- Dusk Blue #26538D ΔE 0.031
- Light Navy #155084 ΔE 0.035
- Blueberry #464196 ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.048
- Twilight #4E518B ΔE 0.050
Use #31488B 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.