#233B83
Closest named color: Twilight Blue (#0A437A). oklch(37.8% 0.125 266.5), rgb(35, 59, 131).
Aa
White text reads best on this color (10.37:1).
About this color
#233B83 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.125 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 10.37:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.02:1 |
| White text | 10.37:1 |
Values
| HEX | #233B83 |
| RGB | rgb(35, 59, 131) |
| HSL | hsl(225, 58%, 33%) |
| OKLCH | oklch(37.8% 0.125 266.5) |
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 #233B83 | 10.37:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #233B83 | 2.02:1 | Fails | Lc 10.2 | Not readable |
| #233B83 text on white | 10.37:1 | AAA | Lc 93.7 | Preferred for body text |
| #233B83 text on black | 2.02:1 | Fails | Lc -8.8 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A5BFFE
oklch(80.8% 0.094 267)
-
Step 400
400
#759CFE
oklch(70.8% 0.15 266.3)
-
Step 500
500
#547FFC
oklch(63.1% 0.192 266.6)
-
Step 600
600
#3B64EB
oklch(55.5% 0.209 266.5)
-
Step 700
700
#2E52CC
oklch(49% 0.193 266.5)
-
Step 800
800
#2644A5
oklch(42.6% 0.16 266.4)
-
Step 900
900 (this color)
#233B83
oklch(37.8% 0.125 266.5)
-
Step 950
950
#14234D
oklch(27% 0.08 266.3)
#233B83 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) | #074586 | 0.030 |
| Deuteranopia (no green cones) | #003C82 | 0.024 |
| Tritanopia (no blue cones) | #004C59 | 0.099 |
| Achromatopsia (no color) | #404040 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233B83
#233B83
oklch(37.8% 0.125 266.5)
- #543E00
#543E00
oklch(37.8% 0.077 85.9)
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 #233B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Cobalt #1E488F ΔE 0.039
- Marine Blue #01386A ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.056
- Light Navy #155084 ΔE 0.059
- Blueberry #464196 ΔE 0.062
- Sapphire #2138AB ΔE 0.066
- Dusk Blue #26538D ΔE 0.069
Use #233B83 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.