#233589
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.141 269), rgb(35, 53, 137).
Aa
White text reads best on this color (10.81:1).
About this color
#233589 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.141 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.049 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #233589 |
| RGB | rgb(35, 53, 137) |
| HSL | hsl(229, 59%, 34%) |
| OKLCH | oklch(37% 0.141 269) |
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 #233589 | 10.81:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #233589 | 1.94:1 | Fails | Lc 9.4 | Not readable |
| #233589 text on white | 10.81:1 | AAA | Lc 94.6 | Preferred for body text |
| #233589 text on black | 1.94:1 | Fails | Lc -8.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600
#405CFA
oklch(55.6% 0.236 269.2)
-
Step 700
700
#334ADA
oklch(49.1% 0.219 269.1)
-
Step 800
800
#2A3EB0
oklch(42.7% 0.181 269.2)
-
Step 900
900 (this color)
#233589
oklch(37% 0.141 269)
-
Step 950
950
#152151
oklch(26.9% 0.089 269)
#233589 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) | #00428C | 0.037 |
| Deuteranopia (no green cones) | #003987 | 0.025 |
| Tritanopia (no blue cones) | #004A59 | 0.113 |
| Achromatopsia (no color) | #3D3D3D | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233589
#233589
oklch(37% 0.141 269)
- #503D00
#503D00
oklch(37% 0.076 88.8)
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 #233589, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.050
- Sapphire #2138AB ΔE 0.057
- Marine Blue #01386A ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.061
- Blueberry #464196 ΔE 0.066
- Royal #0C1793 ΔE 0.070
- Light Navy #155084 ΔE 0.076
Use #233589 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.