#233789
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.139 268.4), rgb(35, 55, 137).
Aa
White text reads best on this color (10.61:1).
About this color
#233789 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.139 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #233789 |
| RGB | rgb(35, 55, 137) |
| HSL | hsl(228, 59%, 34%) |
| OKLCH | oklch(37.4% 0.139 268.4) |
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 #233789 | 10.61:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #233789 | 1.97:1 | Fails | Lc 9.8 | Not readable |
| #233789 text on white | 10.61:1 | AAA | Lc 94.1 | Preferred for body text |
| #233789 text on black | 1.97:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#587DFF
oklch(63.1% 0.197 268.3)
-
Step 600
600
#3E5EF8
oklch(55.7% 0.231 268.4)
-
Step 700
700
#314CD8
oklch(49.1% 0.215 268.4)
-
Step 800
800
#283FAE
oklch(42.6% 0.178 268.4)
-
Step 900
900 (this color)
#233789
oklch(37.4% 0.139 268.4)
-
Step 950
950
#152251
oklch(27.1% 0.088 268.4)
#233789 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) | #00438C | 0.035 |
| Deuteranopia (no green cones) | #003A87 | 0.025 |
| Tritanopia (no blue cones) | #004B5A | 0.110 |
| Achromatopsia (no color) | #3F3F3F | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233789
#233789
oklch(37.4% 0.139 268.4)
- #513E00
#513E00
oklch(37.4% 0.076 89.1)
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 #233789, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Cobalt #1E488F ΔE 0.046
- Sapphire #2138AB ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.059
- Marine Blue #01386A ΔE 0.061
- Blueberry #464196 ΔE 0.063
- Light Navy #155084 ΔE 0.071
- Royal #0C1793 ΔE 0.075
Use #233789 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.