#23428B
Closest named color: Cobalt (#1E488F). oklch(39.9% 0.127 264.1), rgb(35, 66, 139).
Aa
White text reads best on this color (9.44:1).
About this color
#23428B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.127 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #23428B |
| RGB | rgb(35, 66, 139) |
| HSL | hsl(222, 60%, 34%) |
| OKLCH | oklch(39.9% 0.127 264.1) |
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 #23428B | 9.44:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #23428B | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #23428B text on white | 9.44:1 | AAA | Lc 91.5 | Preferred for body text |
| #23428B text on black | 2.22:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8DAFD
oklch(88.6% 0.052 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4B80FE
oklch(63% 0.196 264.3)
-
Step 600
600
#3066ED
oklch(55.7% 0.212 264.1)
-
Step 700
700
#2353CE
oklch(49% 0.197 264.1)
-
Step 800
800
#1E45A7
oklch(42.7% 0.164 264.1)
-
Step 900
900 (this color)
#23428B
oklch(39.9% 0.127 264.1)
-
Step 950
950
#12244D
oklch(27.1% 0.079 264)
#23428B 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) | #144B8E | 0.025 |
| Deuteranopia (no green cones) | #00418A | 0.023 |
| Tritanopia (no blue cones) | #005360 | 0.100 |
| Achromatopsia (no color) | #464646 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23428B
#23428B
oklch(39.9% 0.127 264.1)
- #5C4300
#5C4300
oklch(39.9% 0.082 84.4)
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 #23428B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.035
- Light Navy #155084 ΔE 0.043
- Dusk Blue #26538D ΔE 0.049
- Blueberry #464196 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.057
- Sapphire #2138AB ΔE 0.058
Use #23428B 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.