#233B52
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.4% 0.051 248.5), rgb(35, 59, 82).
Aa
White text reads best on this color (11.54:1).
About this color
#233B52 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.051 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.011 away. White text reads best on it, at 11.54:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #233B52 |
| RGB | rgb(35, 59, 82) |
| HSL | hsl(209, 40%, 23%) |
| OKLCH | oklch(34.4% 0.051 248.5) |
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 #233B52 | 11.54:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #233B52 | 1.81:1 | Fails | Lc 7.4 | Not readable |
| #233B52 text on white | 11.54:1 | AAA | Lc 96.5 | Preferred for body text |
| #233B52 text on black | 1.81:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CFDBE7
oklch(88.6% 0.021 248.1)
-
Step 300
300
#AEC3D9
oklch(80.8% 0.039 249.5)
-
Step 400
400
#83A4C5
oklch(70.6% 0.061 248.7)
-
Step 500
500
#648EB7
oklch(63.2% 0.077 248.5)
-
Step 600
600
#4A77A2
oklch(55.5% 0.084 248.5)
-
Step 700
700
#3B648B
oklch(49.1% 0.078 248.5)
-
Step 800
800
#315271
oklch(42.7% 0.065 248.1)
-
Step 900
900 (this color)
#233B52
oklch(34.4% 0.051 248.5)
-
Step 950
950
#1A2835
oklch(27% 0.031 247.2)
#233B52 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) | #323C53 | 0.021 |
| Deuteranopia (no green cones) | #2B3752 | 0.016 |
| Tritanopia (no blue cones) | #094043 | 0.042 |
| Achromatopsia (no color) | #393939 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233B52
#233B52
oklch(34.4% 0.051 248.5)
- #4A341A
#4A341A
oklch(34.4% 0.051 69.4)
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 #233B52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.011
- Prussian Blue #1D3557 ΔE 0.025
- Midnight Green #073B4C ΔE 0.027
- Gunmetal #293241 ΔE 0.036
- Charcoal #264653 ΔE 0.037
- Onyx #343A40 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.047
Use #233B52 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.