#233D77
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.104 263.9), rgb(35, 61, 119).
Aa
White text reads best on this color (10.47:1).
About this color
#233D77 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.104 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.47:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.47:1 |
Values
| HEX | #233D77 |
| RGB | rgb(35, 61, 119) |
| HSL | hsl(221, 55%, 30%) |
| OKLCH | oklch(37.3% 0.104 263.9) |
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 #233D77 | 10.47:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #233D77 | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #233D77 text on white | 10.47:1 | AAA | Lc 94.0 | Preferred for body text |
| #233D77 text on black | 2.00:1 | Fails | Lc -8.5 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBDAF7
oklch(88.6% 0.043 263.7)
-
Step 300
300
#A7C1F4
oklch(80.9% 0.078 263.6)
-
Step 400
400
#789FEF
oklch(70.8% 0.125 263.7)
-
Step 500
500
#5684E9
oklch(63% 0.16 264)
-
Step 600
600
#3C6CD7
oklch(55.6% 0.173 263.6)
-
Step 700
700
#2F59BB
oklch(49.1% 0.162 263.9)
-
Step 800
800
#274997
oklch(42.6% 0.134 263.9)
-
Step 900
900 (this color)
#233D77
oklch(37.3% 0.104 263.9)
-
Step 950
950
#152546
oklch(27% 0.065 263.2)
#233D77 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) | #1F4379 | 0.017 |
| Deuteranopia (no green cones) | #0E3C76 | 0.019 |
| Tritanopia (no blue cones) | #004A54 | 0.084 |
| Achromatopsia (no color) | #3F3F3F | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D77
#233D77
oklch(37.3% 0.104 263.9)
- #533C00
#533C00
oklch(37.2% 0.076 84.2)
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 #233D77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.039
- Cobalt #1E488F ΔE 0.048
- Light Navy #155084 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.067
Use #233D77 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.