#233B4A
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.04 237), rgb(35, 59, 74).
Aa
White text reads best on this color (11.69:1).
About this color
#233B4A is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.040 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.007 away. White text reads best on it, at 11.69:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #233B4A |
| RGB | rgb(35, 59, 74) |
| HSL | hsl(203, 36%, 21%) |
| OKLCH | oklch(34% 0.04 237) |
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 #233B4A | 11.69:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #233B4A | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #233B4A text on white | 11.69:1 | AAA | Lc 96.8 | Preferred for body text |
| #233B4A text on black | 1.79:1 | Fails | Lc 0.0 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AFC4D2
oklch(80.9% 0.03 237)
-
Step 400
400
#85A6BB
oklch(70.8% 0.048 236.3)
-
Step 500
500
#668FAA
oklch(63% 0.061 237.8)
-
Step 600
600
#4C7996
oklch(55.5% 0.067 237.9)
-
Step 700
700
#3D6680
oklch(49.1% 0.062 237.7)
-
Step 800
800
#335368
oklch(42.7% 0.051 238.4)
-
Step 900
900 (this color)
#233B4A
oklch(34% 0.04 237)
-
Step 950
950
#1A2831
oklch(26.8% 0.025 237.2)
#233B4A 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) | #343B4B | 0.024 |
| Deuteranopia (no green cones) | #2F364A | 0.022 |
| Tritanopia (no blue cones) | #113F40 | 0.031 |
| Achromatopsia (no color) | #383838 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233B4A
#233B4A
oklch(34% 0.04 237)
- #483323
#483323
oklch(34.1% 0.04 58.2)
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 #233B4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.007
- Midnight Green #073B4C ΔE 0.023
- Onyx #343A40 ΔE 0.028
- Gunmetal #293241 ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.035
- Charcoal #264653 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.045
Use #233B4A 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.