#233F5C
Closest named color: Dark Grey Blue (#29465B). oklch(36% 0.061 250.6), rgb(35, 63, 92).
Aa
White text reads best on this color (10.84:1).
About this color
#233F5C is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.061 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 10.84:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #233F5C |
| RGB | rgb(35, 63, 92) |
| HSL | hsl(211, 45%, 25%) |
| OKLCH | oklch(36% 0.061 250.6) |
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 #233F5C | 10.84:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #233F5C | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #233F5C text on white | 10.84:1 | AAA | Lc 95.0 | Preferred for body text |
| #233F5C text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF3
oklch(93.7% 0.013 251.6)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#ABC3DE
oklch(80.8% 0.046 251.5)
-
Step 400
400
#7EA4CD
oklch(70.6% 0.073 250.8)
-
Step 500
500
#5D8DC0
oklch(63% 0.093 250.9)
-
Step 600
600
#4277AD
oklch(55.7% 0.102 250.5)
-
Step 700
700
#336494
oklch(49.2% 0.094 249.9)
-
Step 800
800
#2B5178
oklch(42.6% 0.078 250.7)
-
Step 900
900 (this color)
#233F5C
oklch(36% 0.061 250.6)
-
Step 950
950
#182839
oklch(27.1% 0.038 250.8)
#233F5C 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) | #33405D | 0.021 |
| Deuteranopia (no green cones) | #2B3B5B | 0.015 |
| Tritanopia (no blue cones) | #004649 | 0.052 |
| Achromatopsia (no color) | #3D3D3D | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F5C
#233F5C
oklch(36% 0.061 250.6)
- #513715
#513715
oklch(35.9% 0.061 70.8)
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 #233F5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.028
- Charcoal #264653 ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.034
- Midnight Green #073B4C ΔE 0.040
- Marine Blue #01386A ΔE 0.045
- Onyx #343A40 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
Use #233F5C 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.