#233F82
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.118 264.5), rgb(35, 63, 130).
Aa
White text reads best on this color (9.97:1).
About this color
#233F82 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.118 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.025 away. White text reads best on it, at 9.97:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.97:1 |
Values
| HEX | #233F82 |
| RGB | rgb(35, 63, 130) |
| HSL | hsl(222, 58%, 32%) |
| OKLCH | oklch(38.6% 0.118 264.5) |
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 #233F82 | 9.97:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #233F82 | 2.10:1 | Fails | Lc 11.1 | Not readable |
| #233F82 text on white | 9.97:1 | AAA | Lc 92.8 | Preferred for body text |
| #233F82 text on black | 2.10:1 | Fails | Lc -9.6 | 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
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A4C0FB
oklch(80.8% 0.089 264.8)
-
Step 400
400
#749DF9
oklch(70.6% 0.143 264.8)
-
Step 500
500
#5182F5
oklch(63.1% 0.18 264.5)
-
Step 600
600
#3768E4
oklch(55.6% 0.196 264.5)
-
Step 700
700
#2A56C6
oklch(49.2% 0.182 264.4)
-
Step 800
800
#2347A0
oklch(42.7% 0.151 264.3)
-
Step 900
900 (this color)
#233F82
oklch(38.6% 0.118 264.5)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#233F82 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) | #184784 | 0.023 |
| Deuteranopia (no green cones) | #003E81 | 0.024 |
| Tritanopia (no blue cones) | #004F5A | 0.095 |
| Achromatopsia (no color) | #424242 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F82
#233F82
oklch(38.6% 0.118 264.5)
- #574000
#574000
oklch(38.6% 0.079 85.4)
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 #233F82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.054
- Marine Blue #01386A ΔE 0.054
- Dusk Blue #26538D ΔE 0.059
- Blueberry #464196 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.061
Use #233F82 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.