#233F67
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.077 257.4), rgb(35, 63, 103).
Aa
White text reads best on this color (10.61:1).
About this color
#233F67 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.077 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #233F67 |
| RGB | rgb(35, 63, 103) |
| HSL | hsl(215, 49%, 27%) |
| OKLCH | oklch(36.7% 0.077 257.4) |
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 #233F67 | 10.61:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #233F67 | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #233F67 text on white | 10.61:1 | AAA | Lc 94.4 | Preferred for body text |
| #233F67 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#A9C2E7
oklch(80.8% 0.059 258.1)
-
Step 400
400
#7CA2DA
oklch(70.6% 0.093 257.9)
-
Step 500
500
#5A8AD0
oklch(63% 0.118 257.8)
-
Step 600
600
#3F73BD
oklch(55.6% 0.128 257.5)
-
Step 700
700
#3160A3
oklch(49% 0.119 257.6)
-
Step 800
800
#294F84
oklch(42.7% 0.099 257.1)
-
Step 900
900 (this color)
#233F67
oklch(36.7% 0.077 257.4)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#233F67 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) | #2E4269 | 0.018 |
| Deuteranopia (no green cones) | #243C66 | 0.009 |
| Tritanopia (no blue cones) | #00484E | 0.064 |
| Achromatopsia (no color) | #3E3E3E | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F67
#233F67
oklch(36.7% 0.077 257.4)
- #553900
#553900
oklch(36.8% 0.077 77.9)
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 #233F67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.035
- Marine Blue #01386A ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.046
- Charcoal #264653 ΔE 0.047
- Midnight Green #073B4C ΔE 0.056
- Light Navy #155084 ΔE 0.063
Use #233F67 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.