#233F6D
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.086 259.8), rgb(35, 63, 109).
Aa
White text reads best on this color (10.48:1).
About this color
#233F6D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.086 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.48:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #233F6D |
| RGB | rgb(35, 63, 109) |
| HSL | hsl(217, 51%, 28%) |
| OKLCH | oklch(37.1% 0.086 259.8) |
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 #233F6D | 10.48:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #233F6D | 2.00:1 | Fails | Lc 9.8 | Not readable |
| #233F6D text on white | 10.48:1 | AAA | Lc 94.1 | Preferred for body text |
| #233F6D text on black | 2.00:1 | Fails | Lc -8.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#7AA1E1
oklch(70.6% 0.104 260)
-
Step 500
500
#5889D9
oklch(63.2% 0.132 259.8)
-
Step 600
600
#3D71C6
oklch(55.6% 0.144 259.7)
-
Step 700
700
#2F5EAB
oklch(49% 0.134 259.8)
-
Step 800
800
#284D8B
oklch(42.7% 0.111 260.1)
-
Step 900
900 (this color)
#233F6D
oklch(37.1% 0.086 259.8)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#233F6D 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) | #2A436F | 0.016 |
| Deuteranopia (no green cones) | #203C6C | 0.010 |
| Tritanopia (no blue cones) | #004950 | 0.071 |
| Achromatopsia (no color) | #3F3F3F | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F6D
#233F6D
oklch(37.1% 0.086 259.8)
- #553A00
#553A00
oklch(37% 0.077 79.3)
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 #233F6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.047
- Charcoal #264653 ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.056
- Light Navy #155084 ΔE 0.058
- Cobalt #1E488F ΔE 0.059
Use #233F6D 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.