#323D8B
Closest named color: Cobalt (#1E488F). oklch(39.7% 0.129 273), rgb(50, 61, 139).
Aa
White text reads best on this color (9.65:1).
About this color
#323D8B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #323D8B |
| RGB | rgb(50, 61, 139) |
| HSL | hsl(233, 47%, 37%) |
| OKLCH | oklch(39.7% 0.129 273) |
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 #323D8B | 9.65:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #323D8B | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #323D8B text on white | 9.65:1 | AAA | Lc 92.0 | Preferred for body text |
| #323D8B text on black | 2.17:1 | Fails | Lc -10.4 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD8FE
oklch(88.6% 0.054 272.5)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8298FF
oklch(70.8% 0.152 272.8)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600
#505DEE
oklch(55.6% 0.215 273.2)
-
Step 700
700
#414BCF
oklch(49% 0.201 273)
-
Step 800
800
#353FA8
oklch(42.7% 0.167 272.9)
-
Step 900
900 (this color)
#323D8B
oklch(39.7% 0.129 273)
-
Step 950
950
#1A214E
oklch(27% 0.083 273)
#323D8B 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) | #04498E | 0.043 |
| Deuteranopia (no green cones) | #004189 | 0.040 |
| Tritanopia (no blue cones) | #004F5E | 0.108 |
| Achromatopsia (no color) | #454545 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #323D8B
#323D8B
oklch(39.7% 0.129 273)
- #564500
#564500
oklch(39.7% 0.081 92.8)
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 #323D8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.049
- Sapphire #2138AB ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.073
Use #323D8B 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.