#233F83
Closest named color: Twilight Blue (#0A437A). oklch(38.7% 0.119 264.6), rgb(35, 63, 131).
Aa
White text reads best on this color (9.95:1).
About this color
#233F83 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.119 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 9.95:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.95:1 |
Values
| HEX | #233F83 |
| RGB | rgb(35, 63, 131) |
| HSL | hsl(223, 58%, 33%) |
| OKLCH | oklch(38.7% 0.119 264.6) |
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 #233F83 | 9.95:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #233F83 | 2.11:1 | Fails | Lc 11.2 | Not readable |
| #233F83 text on white | 9.95:1 | AAA | Lc 92.8 | Preferred for body text |
| #233F83 text on black | 2.11:1 | Fails | Lc -9.7 | 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
#739DFA
oklch(70.6% 0.144 264.6)
-
Step 500
500
#5082F7
oklch(63.2% 0.183 264.4)
-
Step 600
600
#3667E6
oklch(55.5% 0.2 264.7)
-
Step 700
700
#2955C8
oklch(49.1% 0.186 264.5)
-
Step 800
800
#2346A1
oklch(42.6% 0.153 264.7)
-
Step 900
900 (this color)
#233F83
oklch(38.7% 0.119 264.6)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#233F83 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) | #174785 | 0.023 |
| Deuteranopia (no green cones) | #003E82 | 0.024 |
| Tritanopia (no blue cones) | #004F5A | 0.097 |
| Achromatopsia (no color) | #434343 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F83
#233F83
oklch(38.7% 0.119 264.6)
- #584000
#584000
oklch(38.7% 0.079 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 #233F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Cobalt #1E488F ΔE 0.030
- Light Navy #155084 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.054
- Marine Blue #01386A ΔE 0.056
- Blueberry #464196 ΔE 0.059
- Dusk Blue #26538D ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.062
Use #233F83 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.