#223E6B
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.085 259.5), rgb(34, 62, 107).
Aa
White text reads best on this color (10.66:1).
About this color
#223E6B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.085 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #223E6B |
| RGB | rgb(34, 62, 107) |
| HSL | hsl(217, 52%, 28%) |
| OKLCH | oklch(36.6% 0.085 259.5) |
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 #223E6B | 10.66:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #223E6B | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #223E6B text on white | 10.66:1 | AAA | Lc 94.5 | Preferred for body text |
| #223E6B text on black | 1.96:1 | Fails | Lc -8.1 | 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 900.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF1
oklch(88.5% 0.035 260.4)
-
Step 300
300
#A9C2EA
oklch(80.9% 0.063 259.7)
-
Step 400
400
#7AA2E0
oklch(70.8% 0.101 258.9)
-
Step 500
500
#5889D8
oklch(63.1% 0.131 259.5)
-
Step 600
600
#3D71C5
oklch(55.5% 0.142 259.6)
-
Step 700
700
#2F5EAA
oklch(49% 0.132 259.6)
-
Step 800
800
#284D8A
oklch(42.6% 0.11 259.9)
-
Step 900
900 (this color)
#223E6B
oklch(36.6% 0.085 259.5)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#223E6B 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) | #2A426D | 0.017 |
| Deuteranopia (no green cones) | #1F3B6A | 0.010 |
| Tritanopia (no blue cones) | #00484F | 0.070 |
| Achromatopsia (no color) | #3E3E3E | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223E6B
#223E6B
oklch(36.6% 0.085 259.5)
- #543900
#543900
oklch(36.6% 0.076 78.9)
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 #223E6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Marine Blue #01386A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.053
- Charcoal #264653 ΔE 0.055
- Midnight Green #073B4C ΔE 0.061
- Marine #042E60 ΔE 0.061
Use #223E6B 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.