#233A55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.3% 0.056 253.3), rgb(35, 58, 85).
Aa
White text reads best on this color (11.61:1).
About this color
#233A55 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.056 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.017 away. White text reads best on it, at 11.61:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.80:1 |
| White text | 11.61:1 |
Values
| HEX | #233A55 |
| RGB | rgb(35, 58, 85) |
| HSL | hsl(212, 42%, 24%) |
| OKLCH | oklch(34.3% 0.056 253.3) |
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 #233A55 | 11.61:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #233A55 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #233A55 text on white | 11.61:1 | AAA | Lc 96.6 | Preferred for body text |
| #233A55 text on black | 1.80:1 | 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
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AEC3DC
oklch(80.9% 0.042 252.9)
-
Step 400
400
#83A3CA
oklch(70.6% 0.068 253.7)
-
Step 500
500
#648CBC
oklch(63% 0.085 253.5)
-
Step 600
600
#4A76A9
oklch(55.6% 0.094 253.1)
-
Step 700
700
#3B6391
oklch(49.1% 0.087 253)
-
Step 800
800
#315175
oklch(42.7% 0.071 252.4)
-
Step 900
900 (this color)
#233A55
oklch(34.3% 0.056 253.3)
-
Step 950
950
#1A2737
oklch(26.9% 0.035 254.1)
#233A55 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) | #2F3B56 | 0.017 |
| Deuteranopia (no green cones) | #293654 | 0.014 |
| Tritanopia (no blue cones) | #054043 | 0.050 |
| Achromatopsia (no color) | #393939 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233A55
#233A55
oklch(34.3% 0.056 253.3)
- #4A3414
#4A3414
oklch(34.3% 0.056 74.1)
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 #233A55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.020
- Midnight Green #073B4C ΔE 0.031
- Gunmetal #293241 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.042
- Onyx #343A40 ΔE 0.043
- Marine Blue #01386A ΔE 0.046
Use #233A55 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.